Solid State Sciences最新文献

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Preparation and photocatalytic degradation properties of Z-scheme Si-TiO2/g-C3N4 heterojunction modified with F-CDs

IF 3.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Solid State Sciences

Pub Date : 2025-02-01 DOI: 10.1016/j.solidstatesciences.2025.107832

Shichang Yuan , Guangchao Yin , Tong Zhao , Jing Zhang , Shuli Wei , Huanian Zhang , Zhaodong Liu , Junkai Zhang , Qing Lu , Meiling Sun

For environmental remediation, the development of innovative photocatalysts for efficient degradation of pollutants is essential. This paper construct three-dimensional (3D) Si-doped TiO₂ (Si-TiO₂) hollow material, and explores its photocatalytic reaction efficiency after composite g-C₃N₄ under F-doped carbon dots (F-CDs) modification. Silica opal template can be used to prepare Si-TiO₂ with hollow spherical structure and layered macroscopic mesoporous structure. Due to the confinement effect of template and the formation of Si-O-Ti bonds, anatase phase Si-TiO₂ hollow spheres do not undergo structural phase transition during high-temperature calcination. The incorporation of g-C₃N₄ can increase the light absorption range, and facilitate the formation of heterojunction with Si-TiO₂, thereby improving the charge carrier generation and separation efficiency. Since F-CDs contains carbon core and abundant surface functional groups, it is favorable to increase the number of active sites and adsorb more g-C₃N₄, thus increasing the heterojunction area. It can also be used as the electronic medium to accelerate carrier separation and transport rate between g-C₃N₄/Si-TiO₂ heterojunctions. Finally, thanks to the large specific surface area, abundance of active sites, excellent light absorption performance and effective charge separation and transport performance, the g-C₃N₄/F-CDs/Si-TiO₂ photocatalyst can decompose 3 mg L⁻¹ of Rh B under visible light, and the degradation rate can reach 74 % in 50 min under 10 mg conditions. The insights gained from this study could provide useful information for the development of effective photocatalysts.

{"title":"Preparation and photocatalytic degradation properties of Z-scheme Si-TiO2/g-C3N4 heterojunction modified with F-CDs","authors":"Shichang Yuan , Guangchao Yin , Tong Zhao , Jing Zhang , Shuli Wei , Huanian Zhang , Zhaodong Liu , Junkai Zhang , Qing Lu , Meiling Sun","doi":"10.1016/j.solidstatesciences.2025.107832","DOIUrl":"10.1016/j.solidstatesciences.2025.107832","url":null,"abstract":"<div><div>For environmental remediation, the development of innovative photocatalysts for efficient degradation of pollutants is essential. This paper construct three-dimensional (3D) Si-doped TiO2 (Si-TiO2) hollow material, and explores its photocatalytic reaction efficiency after composite g-C3N4 under F-doped carbon dots (F-CDs) modification. Silica opal template can be used to prepare Si-TiO2 with hollow spherical structure and layered macroscopic mesoporous structure. Due to the confinement effect of template and the formation of Si-O-Ti bonds, anatase phase Si-TiO2 hollow spheres do not undergo structural phase transition during high-temperature calcination. The incorporation of g-C3N4 can increase the light absorption range, and facilitate the formation of heterojunction with Si-TiO2, thereby improving the charge carrier generation and separation efficiency. Since F-CDs contains carbon core and abundant surface functional groups, it is favorable to increase the number of active sites and adsorb more g-C3N4, thus increasing the heterojunction area. It can also be used as the electronic medium to accelerate carrier separation and transport rate between g-C3N4/Si-TiO2 heterojunctions. Finally, thanks to the large specific surface area, abundance of active sites, excellent light absorption performance and effective charge separation and transport performance, the g-C3N4/F-CDs/Si-TiO2 photocatalyst can decompose 3 mg L−1 of Rh B under visible light, and the degradation rate can reach 74 % in 50 min under 10 mg conditions. The insights gained from this study could provide useful information for the development of effective photocatalysts.</div></div>","PeriodicalId":432,"journal":{"name":"Solid State Sciences","volume":"160 ","pages":"Article 107832"},"PeriodicalIF":3.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143098782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Incorporation of iodine on Ag3PO4 under Nigella Sativa seed extract for enhanced photocatalytic activity

IF 3.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Solid State Sciences

Pub Date : 2025-02-01 DOI: 10.1016/j.solidstatesciences.2025.107836

Uyi Sulaeman , Dea Ajeng Rahma Winarto Putri , Rini Larasati , Eva Vaulina Yulistia Delsy , Isnaeni Isnaeni , Shu Yin

The iodine dopant in photocatalysts has new challenges in improving photocatalytic activity. Here, iodine incorporation in Ag₃PO₄ under potassium iodide (KI) and Nigella sativa seed extract has been successfully prepared using the coprecipitation method. The preparation utilized the starting material of Na₂HPO₄.12H₂O, AgNO₃, Nigella sativa seed extract, and KI with variation concentration as sources of iodine dopant. The results revealed that KI addition causes significant changes in the UV-DRS absorption, PL spectra, FTIR, and Raman spectra. The lower concentration of KI treatment resulted in a more effective iodine dopant in the Ag₃PO₄ surface. This treatment lowers the d-space of the Ag₃PO₄ crystal, increases the bandgap energy, and decreases the P/Ag atomic ratio, resulting in I-doped Ag₃PO₄ with phosphate deficiency. The photocatalytic activity showed a significant effect on the degradation of Rhodamine B (RhB), Methylene Blue (MB), and Methyl Orange (MO). This excellent photocatalytic activity is mainly due to a higher active species of holes and superoxide anion radicals.

{"title":"Incorporation of iodine on Ag3PO4 under Nigella Sativa seed extract for enhanced photocatalytic activity","authors":"Uyi Sulaeman , Dea Ajeng Rahma Winarto Putri , Rini Larasati , Eva Vaulina Yulistia Delsy , Isnaeni Isnaeni , Shu Yin","doi":"10.1016/j.solidstatesciences.2025.107836","DOIUrl":"10.1016/j.solidstatesciences.2025.107836","url":null,"abstract":"<div><div>The iodine dopant in photocatalysts has new challenges in improving photocatalytic activity. Here, iodine incorporation in Ag3PO4 under potassium iodide (KI) and Nigella sativa seed extract has been successfully prepared using the coprecipitation method. The preparation utilized the starting material of Na2HPO4.12H2O, AgNO3, Nigella sativa seed extract, and KI with variation concentration as sources of iodine dopant. The results revealed that KI addition causes significant changes in the UV-DRS absorption, PL spectra, FTIR, and Raman spectra. The lower concentration of KI treatment resulted in a more effective iodine dopant in the Ag3PO4 surface. This treatment lowers the d-space of the Ag3PO4 crystal, increases the bandgap energy, and decreases the P/Ag atomic ratio, resulting in I-doped Ag3PO4 with phosphate deficiency. The photocatalytic activity showed a significant effect on the degradation of Rhodamine B (RhB), Methylene Blue (MB), and Methyl Orange (MO). This excellent photocatalytic activity is mainly due to a higher active species of holes and superoxide anion radicals.</div></div>","PeriodicalId":432,"journal":{"name":"Solid State Sciences","volume":"160 ","pages":"Article 107836"},"PeriodicalIF":3.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143098786","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigating samarium doping effects on the structural, morphological, optical and dielectric properties of zinc cobalt ferrites: A detailed insight

IF 3.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Solid State Sciences

Pub Date : 2025-02-01 DOI: 10.1016/j.solidstatesciences.2025.107824

Ayesha Aslam , Muhammad Tayyab Iqbal , Saqib Shabbir , Shahzab Raza , Majed Yousef Awaji , Hafeez Anwar , Zia Ul Haq

In this study, Samarium-substituted zinc cobalt ferrites [Zn_0.5Co_0.5Sm_xFe_2-xO₄, (0.0 ≤ x ≤ 0.2; step 0.02)] were prepared using the simple co-precipitation technique. XRD analysis with Rietveld refinement confirmed a single-phase spinel cubic structure, with lattice constants ranging from 8.39 to 8.43 Å and 8.385 to 8.420 Å, respectively. Crystallite sizes, determined via Scherrer's and Williamson-Hall methods, ranged between 29.16 - 34.09 nm and 35.2–52.6 nm, respectively. SEM results revealed spherical nanoparticles ranging from 0.28 to 0.38 μm, determined using ImageJ software. FTIR spectra showed metal oxide absorption peaks at 430 cm⁻¹ and 529 cm⁻¹, confirming the presence of a cubic spinel phase. UV–visible analysis indicated a decreasing energy band gap from 2.91 to 2.76 eV with increasing rare earth (RE) Sm³⁺ substitution. The dielectric constant has a maximum value at higher frequencies ranging from 0.5 to 3.2 GHz, while AC conductivity reached a maximum of 0.025 (Ω cm)⁻¹. The electric modulus increased steadily with frequency. Such improved properties make these materials potential candidates for high frequency devices, actuators and energy storage systems applications.

{"title":"Investigating samarium doping effects on the structural, morphological, optical and dielectric properties of zinc cobalt ferrites: A detailed insight","authors":"Ayesha Aslam , Muhammad Tayyab Iqbal , Saqib Shabbir , Shahzab Raza , Majed Yousef Awaji , Hafeez Anwar , Zia Ul Haq","doi":"10.1016/j.solidstatesciences.2025.107824","DOIUrl":"10.1016/j.solidstatesciences.2025.107824","url":null,"abstract":"<div><div>In this study, Samarium-substituted zinc cobalt ferrites [Zn0.5Co0.5SmxFe2-xO4, (0.0 ≤ x ≤ 0.2; step 0.02)] were prepared using the simple co-precipitation technique. XRD analysis with Rietveld refinement confirmed a single-phase spinel cubic structure, with lattice constants ranging from 8.39 to 8.43 Å and 8.385 to 8.420 Å, respectively. Crystallite sizes, determined via Scherrer's and Williamson-Hall methods, ranged between 29.16 - 34.09 nm and 35.2–52.6 nm, respectively. SEM results revealed spherical nanoparticles ranging from 0.28 to 0.38 μm, determined using ImageJ software. FTIR spectra showed metal oxide absorption peaks at 430 cm−1 and 529 cm−1, confirming the presence of a cubic spinel phase. UV–visible analysis indicated a decreasing energy band gap from 2.91 to 2.76 eV with increasing rare earth (RE) Sm3+ substitution. The dielectric constant has a maximum value at higher frequencies ranging from 0.5 to 3.2 GHz, while AC conductivity reached a maximum of 0.025 (Ω cm)−1. The electric modulus increased steadily with frequency. Such improved properties make these materials potential candidates for high frequency devices, actuators and energy storage systems applications.</div></div>","PeriodicalId":432,"journal":{"name":"Solid State Sciences","volume":"160 ","pages":"Article 107824"},"PeriodicalIF":3.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143149345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhanced design optimization of micro-thermoelectric cooler in optical module

IF 3.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Solid State Sciences

Pub Date : 2025-02-01 DOI: 10.1016/j.solidstatesciences.2025.107829

Yutian Liu, Dongwang Yang, Kechen Tang, Jianan Lyu, Zinan Zhang, Chenyang Li, Yu Zheng, YongZhong Jia, Junhao Li, Yonggao Yan

Optical modules serve as crucial components for converting signals between optical and electrical forms in high-speed communication and sensing systems, with their performance dependent on precise temperature control. Thermoelectric devices (TED) provide a solution utilizing the Peltier effect and their efficiency is constrained by the design of their geometric structure. However, while traditional research methods have shown some effectiveness in optimizing the size of single-stage thermoelectric coolers, they may face the trap of local optimal solutions when dealing with complex multi-variable and multi-objective optimization problems, and the search efficiency for global optimal solutions is relatively low. The primary focus of this study is the utilization of thermoelectric devices in 5G/6G optical modules, employing finite element numerical simulation methods to deeply analyze the impact of different geometric parameters (leg height l, leg width w, number of leg pairs p_d) and environmental parameters (ambient temperature T_m, cooling capacity Q_c) on the performance of the devices. To enhance the efficiency of choosing optimal device parameters and meet various performance criteria, a proposed multi-objective optimization strategy is employed. Under the condition of T_m = 90 °C and Q_c = 1 W, the optimal device geometry is as follows: p_d = 224 legs/cm², w = 0.5 mm, l = 0.8 mm, and P_min = 1.5 W. Under the condition of T_m = 90 °C and Q_c = 1.5 W, the optimal device geometry is as follows: p_d = 224 legs/cm², w = 0.5 mm, l = 0.5 mm, and P_min = 2.42 W.

{"title":"Enhanced design optimization of micro-thermoelectric cooler in optical module","authors":"Yutian Liu, Dongwang Yang, Kechen Tang, Jianan Lyu, Zinan Zhang, Chenyang Li, Yu Zheng, YongZhong Jia, Junhao Li, Yonggao Yan","doi":"10.1016/j.solidstatesciences.2025.107829","DOIUrl":"10.1016/j.solidstatesciences.2025.107829","url":null,"abstract":"<div><div>Optical modules serve as crucial components for converting signals between optical and electrical forms in high-speed communication and sensing systems, with their performance dependent on precise temperature control. Thermoelectric devices (TED) provide a solution utilizing the Peltier effect and their efficiency is constrained by the design of their geometric structure. However, while traditional research methods have shown some effectiveness in optimizing the size of single-stage thermoelectric coolers, they may face the trap of local optimal solutions when dealing with complex multi-variable and multi-objective optimization problems, and the search efficiency for global optimal solutions is relatively low. The primary focus of this study is the utilization of thermoelectric devices in 5G/6G optical modules, employing finite element numerical simulation methods to deeply analyze the impact of different geometric parameters (leg height l, leg width w, number of leg pairs pd) and environmental parameters (ambient temperature Tm, cooling capacity Qc) on the performance of the devices. To enhance the efficiency of choosing optimal device parameters and meet various performance criteria, a proposed multi-objective optimization strategy is employed. Under the condition of Tm = 90 °C and Qc = 1 W, the optimal device geometry is as follows: pd = 224 legs/cm2, w = 0.5 mm, l = 0.8 mm, and Pmin = 1.5 W. Under the condition of Tm = 90 °C and Qc = 1.5 W, the optimal device geometry is as follows: pd = 224 legs/cm2, w = 0.5 mm, l = 0.5 mm, and Pmin = 2.42 W.</div></div>","PeriodicalId":432,"journal":{"name":"Solid State Sciences","volume":"160 ","pages":"Article 107829"},"PeriodicalIF":3.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143098777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of Pr³⁺ substitution on the structural, optical, magnetic, and dielectric properties of Sr2FeTiO6−δ double perovskites

IF 3.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Solid State Sciences

Pub Date : 2025-02-01 DOI: 10.1016/j.solidstatesciences.2025.107825

J. Stella Punitha , Ramesh Kumar Raji , Tholkappiyan Ramachandran , K. Saravana Kumar , Muthu Dhilip , Fathalla Hamed , A. Nataraj

Double perovskite compounds Sr_2-xPr_xFeTiO_6−δ (x = 0.2, 0.4, 0.6, 0.8) were synthesized using a high-temperature solid-state reaction method. X-ray diffraction (XRD) analysis confirmed that all samples exhibit a cubic structure with a space group of Pm-3m. Rietveld refinement using the pseudo-Voigt function confirmed the formation of a single-phase compound with good reliability factors. Scanning electron microscopy (SEM) showed that the particles were spherical with minimal clumping and were uniform in size and shape. Energy dispersive X-ray (EDAX) analysis confirmed the presence of Sr, Pr, Ti, Fe, and O elements. The oxidation states of the constituent elements were validated by X-ray photoelectron spectroscopy (XPS), confirming the stability of the crystal structure. Diffuse reflectance spectroscopy indicated semiconductor-like behavior, with the energy band gap decreasing from 3.24 eV to 2.71 eV as Pr content increased. Dielectric studies showed a frequency and temperature-dependent dielectric constant increases with increasing Pr substitution from x = 0.2 to 0.8. Magnetic measurements revealed a transition from antiferromagnetic to ferromagnetic characteristic as the Pr concentration increased. These findings suggest that the synthesized Sr_2-xPr_xFeTiO_6−δ compounds are promising candidates for use in advanced electronic technologies, magneto-optical storage, optoelectronic devices, and sensor applications.

{"title":"Influence of Pr³⁺ substitution on the structural, optical, magnetic, and dielectric properties of Sr2FeTiO6−δ double perovskites","authors":"J. Stella Punitha , Ramesh Kumar Raji , Tholkappiyan Ramachandran , K. Saravana Kumar , Muthu Dhilip , Fathalla Hamed , A. Nataraj","doi":"10.1016/j.solidstatesciences.2025.107825","DOIUrl":"10.1016/j.solidstatesciences.2025.107825","url":null,"abstract":"<div><div>Double perovskite compounds Sr2-xPrxFeTiO6−δ (x = 0.2, 0.4, 0.6, 0.8) were synthesized using a high-temperature solid-state reaction method. X-ray diffraction (XRD) analysis confirmed that all samples exhibit a cubic structure with a space group of Pm-3m. Rietveld refinement using the pseudo-Voigt function confirmed the formation of a single-phase compound with good reliability factors. Scanning electron microscopy (SEM) showed that the particles were spherical with minimal clumping and were uniform in size and shape. Energy dispersive X-ray (EDAX) analysis confirmed the presence of Sr, Pr, Ti, Fe, and O elements. The oxidation states of the constituent elements were validated by X-ray photoelectron spectroscopy (XPS), confirming the stability of the crystal structure. Diffuse reflectance spectroscopy indicated semiconductor-like behavior, with the energy band gap decreasing from 3.24 eV to 2.71 eV as Pr content increased. Dielectric studies showed a frequency and temperature-dependent dielectric constant increases with increasing Pr substitution from x = 0.2 to 0.8. Magnetic measurements revealed a transition from antiferromagnetic to ferromagnetic characteristic as the Pr concentration increased. These findings suggest that the synthesized Sr2-xPrxFeTiO6−δ compounds are promising candidates for use in advanced electronic technologies, magneto-optical storage, optoelectronic devices, and sensor applications.</div></div>","PeriodicalId":432,"journal":{"name":"Solid State Sciences","volume":"160 ","pages":"Article 107825"},"PeriodicalIF":3.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143098780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Coral like g-C3N4/Br-Bi2O2CO3 type-II heterojunction with efficient photocatalytic performance and mechanism for degradation of tetracycline

IF 3.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Solid State Sciences

Pub Date : 2025-02-01 DOI: 10.1016/j.solidstatesciences.2024.107765

Bowen Lu , Ling Wang , Xiaoya Zhu , Qinyi Gu , Chujun Feng , Jian Rong , Zhongyu Li , Song Xu

Photocatalytic technology is an effective strategy to address the proliferation of antibiotics. In this study, a coral-like g-C₃N₄/Br-Bi₂O₂CO₃ (C-CN/Br-BOC) photocatalyst with a type-Ⅱ heterojunction was constructed for efficient degradation of tetracycline (TC). The as-prepared C-CN/Br-BOC composites showed excellent photocatalytic performance for degradation of tetracycline. The degradation efficiency of 0.7C-CN/Br-BOC photocatalyst reached 94.2 % within 120 min, and the catalytic performance and crystal structure remained stable after 5 cycles. The enhancement of photocatalytic activity can be attributed to the formation of type-II heterojunction and the successful doping of Br elements, which significantly improves the separation ability and electron mobility of the electron-hole pairs produced by photons. In addition, the photocatalytic mechanism of C-CN/Br-BOC heterojunction and degradation pathways of TC are also proposed.

{"title":"Coral like g-C3N4/Br-Bi2O2CO3 type-II heterojunction with efficient photocatalytic performance and mechanism for degradation of tetracycline","authors":"Bowen Lu , Ling Wang , Xiaoya Zhu , Qinyi Gu , Chujun Feng , Jian Rong , Zhongyu Li , Song Xu","doi":"10.1016/j.solidstatesciences.2024.107765","DOIUrl":"10.1016/j.solidstatesciences.2024.107765","url":null,"abstract":"<div><div>Photocatalytic technology is an effective strategy to address the proliferation of antibiotics. In this study, a coral-like g-C3N4/Br-Bi2O2CO3 (C-CN/Br-BOC) photocatalyst with a type-Ⅱ heterojunction was constructed for efficient degradation of tetracycline (TC). The as-prepared C-CN/Br-BOC composites showed excellent photocatalytic performance for degradation of tetracycline. The degradation efficiency of 0.7C-CN/Br-BOC photocatalyst reached 94.2 % within 120 min, and the catalytic performance and crystal structure remained stable after 5 cycles. The enhancement of photocatalytic activity can be attributed to the formation of type-II heterojunction and the successful doping of Br elements, which significantly improves the separation ability and electron mobility of the electron-hole pairs produced by photons. In addition, the photocatalytic mechanism of C-CN/Br-BOC heterojunction and degradation pathways of TC are also proposed.</div></div>","PeriodicalId":432,"journal":{"name":"Solid State Sciences","volume":"160 ","pages":"Article 107765"},"PeriodicalIF":3.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143093192","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tailoring Ge-Sb-Te alloys for thermoelectric applications: A review on insights from doping studies

IF 3.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Solid State Sciences

Pub Date : 2025-02-01 DOI: 10.1016/j.solidstatesciences.2024.107813

Puspender Singh Beniwal, Yogita Batra

Ge-Sb-Te (GST) alloys have garnered considerable interest due to their rapid crystallization rates, thermal stability, and reversible phase change. These characteristics make them promising candidates for various applications, including thermoelectric energy conversion. Doping GST alloys has been found to enhance their thermal stability and modify the temperature at which the amorphous-to-crystalline phase transition occurs. The doping process alters the excitation energy and transition temperature of the material allowing customization for specific applications. It gives useful insights to tailor the composition of GST alloys for improved thermoelectric performance. Understanding of these processes can aid in the development of high-performance GST alloy-based thermoelectric devices, enabling efficient energy conversion and utilization of waste heat. This review discusses the potential of GST as a thermoelectric material and examines the effect of doping on its characteristics. The article begins with thermoelectric fundamentals followed by a discussion on unique properties of GST. It provides a brief explanation of the techniques used to boost the ZT value. Additionally, it discusses various strategies to get around the interdependency of factors and increase ZT. Further experimental and theoretical studies are necessary to completely utilize the potential of GST alloys in thermoelectric applications.

{"title":"Tailoring Ge-Sb-Te alloys for thermoelectric applications: A review on insights from doping studies","authors":"Puspender Singh Beniwal, Yogita Batra","doi":"10.1016/j.solidstatesciences.2024.107813","DOIUrl":"10.1016/j.solidstatesciences.2024.107813","url":null,"abstract":"<div><div>Ge-Sb-Te (GST) alloys have garnered considerable interest due to their rapid crystallization rates, thermal stability, and reversible phase change. These characteristics make them promising candidates for various applications, including thermoelectric energy conversion. Doping GST alloys has been found to enhance their thermal stability and modify the temperature at which the amorphous-to-crystalline phase transition occurs. The doping process alters the excitation energy and transition temperature of the material allowing customization for specific applications. It gives useful insights to tailor the composition of GST alloys for improved thermoelectric performance. Understanding of these processes can aid in the development of high-performance GST alloy-based thermoelectric devices, enabling efficient energy conversion and utilization of waste heat. This review discusses the potential of GST as a thermoelectric material and examines the effect of doping on its characteristics. The article begins with thermoelectric fundamentals followed by a discussion on unique properties of GST. It provides a brief explanation of the techniques used to boost the ZT value. Additionally, it discusses various strategies to get around the interdependency of factors and increase ZT. Further experimental and theoretical studies are necessary to completely utilize the potential of GST alloys in thermoelectric applications.</div></div>","PeriodicalId":432,"journal":{"name":"Solid State Sciences","volume":"160 ","pages":"Article 107813"},"PeriodicalIF":3.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143149350","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Molten salt flux synthesis of two new alkali rare earth silicate fluorides: Rb3Sc2[Si4O12]F and Rb2Sm[Si4O10]F

IF 3.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Solid State Sciences

Pub Date : 2025-02-01 DOI: 10.1016/j.solidstatesciences.2024.107802

Hunter B. Tisdale , Hans-Conrad zur Loye

Two new alkali rare earth silicate fluorides have been synthesized as single crystals in a molten eutectic flux, RbCl/HRbF₂. Rb₃Sc₂[Si₄O₁₂]F crystallizes in a novel structure type with the orthorhombic, noncentrosymmetric space group Pna2₁ and lattice parameters a = 18.5645(13) Å, b = 6.7591(4) Å, and c = 10.4217(7) Å. Rb₂Sm[Si₄O₁₀]F forms as a distortion of the known A₂Ln[Si₄O₁₀]F structure, crystallizing in the monoclinic space group P2₁/m, with lattice parameters a = 8.0886(2) Å, b = 8.8000(3) Å, c = 8.2285(3) Å, and β = 90.2350(10)°. The syntheses and structures of these two compositions are discussed as well as the optical behavior of the Eu-doped Rb₃[Sc_1.9Eu_0.1][Si₄O₁₂]F.

引用次数: 0

Pb1−xCoxSnS3: Synthesis, structure, and magnetic properties of a series of quaternary chalcogenides

IF 3.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Solid State Sciences

Pub Date : 2025-02-01 DOI: 10.1016/j.solidstatesciences.2024.107818

Tuhin Subhra Dash , Prasanjit Agasti , Abinash Pradhan , Debakanta Samal , Saroj L. Samal

Quaternary metal chalcogenides, Pb_1−xCo_xSnS₃ (x = 0.00, 0.10, 0.20, and 0.40), were synthesized from high purity elements at high temperature via sealed tube solid state synthesis method. All the compounds crystallised in the orthorhombic crystal system with Pnma space group. Single crystal study indicated that Co substitute at the Pb-site in Pb_1−xCo_xSnS₃ in a disordered manner. The structure of Pb_1−xCo_xSnS₃ compounds contains edge shared bi-octahedral chains of SnS₆ and zig-zag chains of (Pb/Co)S running along b-direction. XPS study indicates that cobalt exists as Co²⁺ while tin and sulphur remain as Sn⁴⁺ and S²⁻ respectively. Magnetic susceptibility studies on Pb_1−xCo_xSnS₃ (x = 0.1, 0.2 and 0.40) suggest ferromagnetic ordering below 125 K. The Pb/Co-S-Pb/Co bond angle (88.6°) in the Pb/Co-S chains is very close to 90° suggesting ferromagnetic ordering in these compounds, which corroborate the magnetic susceptibility results. As the amount of Co substitution increases, the magnetic susceptibility values gradually increases as evident from the M-T curves, which is attributed to substitution of more Co²⁺ at the non-magnetic Pb²⁺ site in Pb_1−xCo_xSnS₃. The M − H isotherms reveal saturation magnetic moment that is smaller than the expected value, possibly due to disorder of the magnetic ions in these compounds. However, neutron diffraction study is required to completely understand the detailed magnetic properties in these compounds.

{"title":"Pb1−xCoxSnS3: Synthesis, structure, and magnetic properties of a series of quaternary chalcogenides","authors":"Tuhin Subhra Dash , Prasanjit Agasti , Abinash Pradhan , Debakanta Samal , Saroj L. Samal","doi":"10.1016/j.solidstatesciences.2024.107818","DOIUrl":"10.1016/j.solidstatesciences.2024.107818","url":null,"abstract":"<div><div>Quaternary metal chalcogenides, Pb1−xCoxSnS3 (x = 0.00, 0.10, 0.20, and 0.40), were synthesized from high purity elements at high temperature via sealed tube solid state synthesis method. All the compounds crystallised in the orthorhombic crystal system with Pnma space group. Single crystal study indicated that Co substitute at the Pb-site in Pb1−xCoxSnS3 in a disordered manner. The structure of Pb1−xCoxSnS3 compounds contains edge shared bi-octahedral chains of SnS6 and zig-zag chains of (Pb/Co)S running along b-direction. XPS study indicates that cobalt exists as Co2+ while tin and sulphur remain as Sn4+ and S2− respectively. Magnetic susceptibility studies on Pb1−xCoxSnS3 (x = 0.1, 0.2 and 0.40) suggest ferromagnetic ordering below 125 K. The Pb/Co-S-Pb/Co bond angle (88.6°) in the Pb/Co-S chains is very close to 90° suggesting ferromagnetic ordering in these compounds, which corroborate the magnetic susceptibility results. As the amount of Co substitution increases, the magnetic susceptibility values gradually increases as evident from the M-T curves, which is attributed to substitution of more Co2+ at the non-magnetic Pb2+ site in Pb1−xCoxSnS3. The M − H isotherms reveal saturation magnetic moment that is smaller than the expected value, possibly due to disorder of the magnetic ions in these compounds. However, neutron diffraction study is required to completely understand the detailed magnetic properties in these compounds.</div></div>","PeriodicalId":432,"journal":{"name":"Solid State Sciences","volume":"160 ","pages":"Article 107818"},"PeriodicalIF":3.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143149343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Carbon nanotube-mediated Ni3(PO4)2/NiCo2O4 hybrids for advanced energy storage in asymmetric supercapacitors

IF 3.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Solid State Sciences

Pub Date : 2025-02-01 DOI: 10.1016/j.solidstatesciences.2025.107834

Lei Yuan, Zhenyu Zhu, Dongkun Fan, Jiarui Xun, Jie Liu, Ku Jiang, Liwei Zhang, Na Xin

A simple hydrothermal method was proposed to synthesize a high contact area Ni₃(PO₄)₂/NiCo₂O₄@CNTs composite material for asymmetric supercapacitors. By utilizing the advantages of both phosphates and bimetallic oxides and their synergistic effect after compounding, a hierarchical structure is formed, thereby improving the overall electrochemical performance of the composite material. The capacitance of this electrode material is 1563 F g⁻¹ (1 A g⁻¹). The capacitance of the asymmetric supercapacitor assembled positive electrode Ni₃(PO₄)₂/NiCo₂O₄@CNTs and negative electrode activated carbon (AC) as the negative electrode is 102.2 F⁻¹ at 1 A g⁻¹. The capacity retention rate is 83.6 % after 10,000 charge and discharge cycles. In addition, when the power density is 800 W kg⁻¹, its specific energy is as high as 36.3 Wh kg⁻¹. It proves that the composite materials prepared by this strategy have the potential application as electrode materials for capacitors.

{"title":"Carbon nanotube-mediated Ni3(PO4)2/NiCo2O4 hybrids for advanced energy storage in asymmetric supercapacitors","authors":"Lei Yuan, Zhenyu Zhu, Dongkun Fan, Jiarui Xun, Jie Liu, Ku Jiang, Liwei Zhang, Na Xin","doi":"10.1016/j.solidstatesciences.2025.107834","DOIUrl":"10.1016/j.solidstatesciences.2025.107834","url":null,"abstract":"<div><div>A simple hydrothermal method was proposed to synthesize a high contact area Ni3(PO4)2/NiCo2O4@CNTs composite material for asymmetric supercapacitors. By utilizing the advantages of both phosphates and bimetallic oxides and their synergistic effect after compounding, a hierarchical structure is formed, thereby improving the overall electrochemical performance of the composite material. The capacitance of this electrode material is 1563 F g−1 (1 A g−1). The capacitance of the asymmetric supercapacitor assembled positive electrode Ni3(PO4)2/NiCo2O4@CNTs and negative electrode activated carbon (AC) as the negative electrode is 102.2 F−1 at 1 A g−1. The capacity retention rate is 83.6 % after 10,000 charge and discharge cycles. In addition, when the power density is 800 W kg−1, its specific energy is as high as 36.3 Wh kg−1. It proves that the composite materials prepared by this strategy have the potential application as electrode materials for capacitors.</div></div>","PeriodicalId":432,"journal":{"name":"Solid State Sciences","volume":"160 ","pages":"Article 107834"},"PeriodicalIF":3.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143149426","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

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