{"title":"Enhanced ion conductivity and stability against Li metal in Dy3+-doped Li2ZrCl6 electrolytes for high-performance all-solid-state batteries","authors":"Ying Liang, Chuangjie Guo, Ying Qi, Hetian Chen, Haocheng Yuan, Dengfeng Yu, Peipei Ding, Yue Li, Hong Liu, Yaoyu Ren, Xue Zhang, Ce-Wen Nan","doi":"10.1016/j.jmat.2026.101178","DOIUrl":"https://doi.org/10.1016/j.jmat.2026.101178","url":null,"abstract":"","PeriodicalId":16173,"journal":{"name":"Journal of Materiomics","volume":"78 1","pages":""},"PeriodicalIF":9.4,"publicationDate":"2026-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146071512","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-24DOI: 10.1016/j.jmat.2026.101176
Konrad Eiler, Huan Tan, Aitor Arredondo-López, Pau Solsona, Eva Pellicer, Jordi Sort
Electric-field control of ferromagnetism is demonstrated in a mechanically flexible solid-state system through a proton-induced redox reaction at room temperature. Protons transported through a perfluorosulfonic acid (PFSA) proton exchange membrane (PEM) trigger the reduction of CoO by reacting with lattice oxygen, which enables reversible switching between paramagnetic and ferromagnetic states starting at voltages below 10 V. The proton supply is sustained by ambient humidity and water splitting at a Pt thin film counter electrode. Due to its flexibility, the device architecture—a sandwich of CoO and Pt thin films integrated with the polymeric PEM—retains full magneto-ionic functionality under mechanical bending. Three CoO films, synthesized via reactive sputtering under varying conditions, are compared: amorphous, crystalline, and mixed-phase CoO/Co. While the amorphous film exhibits weak response, both the crystalline and mixed-phase films show pronounced electric-field-dependent magnetic switching, highlighting the critical role of microstructure in magneto-ionic performance.
{"title":"Proton-driven ferromagnetic switching of CoO in flexible magneto-ionic cells","authors":"Konrad Eiler, Huan Tan, Aitor Arredondo-López, Pau Solsona, Eva Pellicer, Jordi Sort","doi":"10.1016/j.jmat.2026.101176","DOIUrl":"https://doi.org/10.1016/j.jmat.2026.101176","url":null,"abstract":"Electric-field control of ferromagnetism is demonstrated in a mechanically flexible solid-state system through a proton-induced redox reaction at room temperature. Protons transported through a perfluorosulfonic acid (PFSA) proton exchange membrane (PEM) trigger the reduction of CoO by reacting with lattice oxygen, which enables reversible switching between paramagnetic and ferromagnetic states starting at voltages below 10 V. The proton supply is sustained by ambient humidity and water splitting at a Pt thin film counter electrode. Due to its flexibility, the device architecture—a sandwich of CoO and Pt thin films integrated with the polymeric PEM—retains full magneto-ionic functionality under mechanical bending. Three CoO films, synthesized <em>via</em> reactive sputtering under varying conditions, are compared: amorphous, crystalline, and mixed-phase CoO/Co. While the amorphous film exhibits weak response, both the crystalline and mixed-phase films show pronounced electric-field-dependent magnetic switching, highlighting the critical role of microstructure in magneto-ionic performance.","PeriodicalId":16173,"journal":{"name":"Journal of Materiomics","volume":"395 1","pages":""},"PeriodicalIF":9.4,"publicationDate":"2026-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146044813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Low read/write voltage and high endurance of the ferroelectric memory with Hf0.5Zr0.5O2 film","authors":"Hongdi Wu, Guodong Zhang, Junfeng Zheng, Xubing Lu, Jun-Ming Liu, Guoliang Yuan","doi":"10.1016/j.jmat.2026.101175","DOIUrl":"https://doi.org/10.1016/j.jmat.2026.101175","url":null,"abstract":"","PeriodicalId":16173,"journal":{"name":"Journal of Materiomics","volume":"85 1","pages":""},"PeriodicalIF":9.4,"publicationDate":"2026-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146014431","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01Epub Date: 2025-05-29DOI: 10.1016/j.jmat.2025.101091
Zhixing Wan , Shuo Wang , Yahao Mu , Ruihua Zhou , Hang Liu , Tingwu Jin , Di Wu , Jianlong Xia , Ce-Wen Nan
Organic cathode materials have garnered significant attention for their potential application in lithium-ion batteries due to their lightweight nature, tunable structures, high energy density, and environmental friendliness. However, the dissolution of organic cathodes in liquid electrolytes often leads to poor cycling stability, which limits their practical application. In this study, a composite cathode was prepared by ball milling the PTCDA/CuS (perylene-3,4,9,10-tetracarboxylic dianhydride, PTCDA) with a sulfide-based electrolyte and carbon nanotubes. By optimizing the component ratios, the assembled all-solid-state batteries (ASSBs) show a high discharge capacity of 210 mA⸱h/g after 200 cycles without any capacity degradation at a current density of 33.0 mA/g. Through comprehensive characterization techniques including X-ray diffraction (XRD), Raman spectroscopy, Fourier-transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS), the coordination of Cu2+ and the formation of sulfur-linked polymers during the charge-discharge processes are elucidated, and the reversibility of the electrochemical reactions has been confirmed. This work highlights the excellent compatibility between organic cathodes and sulfide-based electrolytes, providing a new way for the development of high-performance ASSBs with high energy density and extended lifespan.
{"title":"PTCDA/CuS cathode enabling stable sulfide-based all-solid-state batteries","authors":"Zhixing Wan , Shuo Wang , Yahao Mu , Ruihua Zhou , Hang Liu , Tingwu Jin , Di Wu , Jianlong Xia , Ce-Wen Nan","doi":"10.1016/j.jmat.2025.101091","DOIUrl":"10.1016/j.jmat.2025.101091","url":null,"abstract":"<div><div>Organic cathode materials have garnered significant attention for their potential application in lithium-ion batteries due to their lightweight nature, tunable structures, high energy density, and environmental friendliness. However, the dissolution of organic cathodes in liquid electrolytes often leads to poor cycling stability, which limits their practical application. In this study, a composite cathode was prepared by ball milling the PTCDA/CuS (perylene-3,4,9,10-tetracarboxylic dianhydride, PTCDA) with a sulfide-based electrolyte and carbon nanotubes. By optimizing the component ratios, the assembled all-solid-state batteries (ASSBs) show a high discharge capacity of 210 mA⸱h/g after 200 cycles without any capacity degradation at a current density of 33.0 mA/g. Through comprehensive characterization techniques including X-ray diffraction (XRD), Raman spectroscopy, Fourier-transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS), the coordination of Cu<sup>2+</sup> and the formation of sulfur-linked polymers during the charge-discharge processes are elucidated, and the reversibility of the electrochemical reactions has been confirmed. This work highlights the excellent compatibility between organic cathodes and sulfide-based electrolytes, providing a new way for the development of high-performance ASSBs with high energy density and extended lifespan.</div></div>","PeriodicalId":16173,"journal":{"name":"Journal of Materiomics","volume":"12 1","pages":"Article 101091"},"PeriodicalIF":9.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144176964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01Epub Date: 2025-06-23DOI: 10.1016/j.jmat.2025.101102
Marija Dunce , Vladimir V. Shvartsman , Mahmoud Hotari , Doru C. Lupascu , Eriks Birks , Andrei Kholkin
The stability of the polarization state in Na0.5Bi0.5TiO3 (NBT) ceramics has been a long-standing problem for its use in piezoelectric applications at elevated temperatures. It has been generally believed that the polarization state, depolarization temperature, and depolarization process are all linked to the grain size in these materials. In this work, we perform a thorough Piezoresponse Force Microscopy (PFM) study of the NBT ceramic samples with substantially different grain sizes sintered as a function of temperature. As-grown, macroscopically poled, and locally poled samples were investigated focusing on the polarization behavior at depolarization temperature. Switching Spectroscopy PFM (SS-PFM) measurements were conducted as a function of grain size and temperature. No direct correlation is observed between the grain size and the switching parameters in any sample. However, temperature-dependent measurements reveal significant differences that are explained by different concentrations of oxygen vacancies. We rationalized the observed behavior, e.g. apparent stabilization of the locally probed polarization above the depolarization temperature, by accumulation and depletion of oxygen vacancies in the vicinity of the internal boundary of the poled region. Significant asymmetry of the PFM hysteresis loops at elevated temperatures confirms this assumption.
{"title":"Polarization stability in lead-free Na0.5Bi0.5TiO3 ceramics: Grain size and temperature effects","authors":"Marija Dunce , Vladimir V. Shvartsman , Mahmoud Hotari , Doru C. Lupascu , Eriks Birks , Andrei Kholkin","doi":"10.1016/j.jmat.2025.101102","DOIUrl":"10.1016/j.jmat.2025.101102","url":null,"abstract":"<div><div>The stability of the polarization state in Na<sub>0.5</sub>Bi<sub>0.5</sub>TiO<sub>3</sub> (NBT) ceramics has been a long-standing problem for its use in piezoelectric applications at elevated temperatures. It has been generally believed that the polarization state, depolarization temperature, and depolarization process are all linked to the grain size in these materials. In this work, we perform a thorough Piezoresponse Force Microscopy (PFM) study of the NBT ceramic samples with substantially different grain sizes sintered as a function of temperature. As-grown, macroscopically poled, and locally poled samples were investigated focusing on the polarization behavior at depolarization temperature. Switching Spectroscopy PFM (SS-PFM) measurements were conducted as a function of grain size and temperature. No direct correlation is observed between the grain size and the switching parameters in any sample. However, temperature-dependent measurements reveal significant differences that are explained by different concentrations of oxygen vacancies. We rationalized the observed behavior, <em>e.g.</em> apparent stabilization of the locally probed polarization above the depolarization temperature, by accumulation and depletion of oxygen vacancies in the vicinity of the internal boundary of the poled region. Significant asymmetry of the PFM hysteresis loops at elevated temperatures confirms this assumption.</div></div>","PeriodicalId":16173,"journal":{"name":"Journal of Materiomics","volume":"12 1","pages":"Article 101102"},"PeriodicalIF":9.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144341088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01Epub Date: 2025-06-26DOI: 10.1016/j.jmat.2025.101105
Cancan Shao , Xiaoming Shi , Ke Xu , Rongzhen Gao , Shiyu Tang , Zhaobo Liu , Houbing Huang
The exceptional breakdown field strength of polymers, combined with the large spontaneous polarization exhibited by inorganic ferroelectric materials, has led to continuous advancements in the records for the giant electrocaloric effect (ECE) in polymer composites enhanced by ferroelectric inorganic components. This study aims to investigate the ECE properties of P(VDF-TrFE-CFE)/Ba0.67Sr0.33TiO3 (BST67) composites by analyzing the aspect ratio, composition ratio, and orientation of BST67 nanoparticles in conjunction with the P(VDF-TrFE-CFE) matrix. The results of the P–E loop calculations indicate that all three factors related to the BST67 nanoparticles enhance the ferroelectric polarization value of the composite material. This enhancement is attributed to the longer aspect ratio, higher composition ratio, and improved orientation, which enable the BST67 nanoparticles to achieve a greater electric field strength. The calculation of ΔT using the LGD method reveals that these three factors of BST67 can independently increase ΔT, and they exhibit a synergistic effect on the ECE performance of the ferroelectric polymer. Our conclusions provide valuable insights for future research on ECE in polymer/inorganic ferroelectric composites.
{"title":"Nanofiller orientation-enhanced electrocaloric effect: A case study of P(VDF-TrFE-CFE)/Ba0.67Sr0.33TiO3 composites","authors":"Cancan Shao , Xiaoming Shi , Ke Xu , Rongzhen Gao , Shiyu Tang , Zhaobo Liu , Houbing Huang","doi":"10.1016/j.jmat.2025.101105","DOIUrl":"10.1016/j.jmat.2025.101105","url":null,"abstract":"<div><div>The exceptional breakdown field strength of polymers, combined with the large spontaneous polarization exhibited by inorganic ferroelectric materials, has led to continuous advancements in the records for the giant electrocaloric effect (ECE) in polymer composites enhanced by ferroelectric inorganic components. This study aims to investigate the ECE properties of P(VDF-TrFE-CFE)/Ba<sub>0.67</sub>Sr<sub>0.33</sub>TiO<sub>3</sub> (BST67) composites by analyzing the aspect ratio, composition ratio, and orientation of BST67 nanoparticles in conjunction with the P(VDF-TrFE-CFE) matrix. The results of the <em>P</em>–<em>E</em> loop calculations indicate that all three factors related to the BST67 nanoparticles enhance the ferroelectric polarization value of the composite material. This enhancement is attributed to the longer aspect ratio, higher composition ratio, and improved orientation, which enable the BST67 nanoparticles to achieve a greater electric field strength. The calculation of Δ<em>T</em> using the LGD method reveals that these three factors of BST67 can independently increase Δ<em>T</em>, and they exhibit a synergistic effect on the ECE performance of the ferroelectric polymer. Our conclusions provide valuable insights for future research on ECE in polymer/inorganic ferroelectric composites.</div></div>","PeriodicalId":16173,"journal":{"name":"Journal of Materiomics","volume":"12 1","pages":"Article 101105"},"PeriodicalIF":9.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144515636","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01Epub Date: 2025-08-08DOI: 10.1016/j.jmat.2025.101117
Mingyue Yang , Liangyu Mo , Jincheng Qin , Faqiang Zhang , Mingsheng Ma , Yongxiang Li , Zhifu Liu
The temperature coefficient of resonance frequency (τf or TCF) is the key parameter for evaluating temperature stability of microwave dielectric ceramics. In this work, a machine learning framework was proposed to predict the τf values of ABO3-type microwave dielectric ceramics. Leveraging a curated dataset of 104 single-phase ABO3-type compounds, we systematically evaluated models based on five machine learning algorithms using 31 structural descriptors as input features. The eXtreme Gradient Boosting (XGB) algorithm emerged as the optimal predictive model, demonstrating robust performance on the test set (R2 = 0.7799, RMSE = 15.7494 × 10−6 °C−1). Consistent results on the validation set further confirmed its generalization capability. Critical features contributing to the model's performance include molecular dielectric polarizability (pm), tolerance factor (tt), ionic volume (Vi) and relative molecular mass (m). Structure-property relationship studies revealed that the pm plays an important role in modulating the τf value by affecting the permittivity. Quantitative thresholds for these critical descriptors were also derived for identifying materials with near-zero τf. This work provides an effective data-driven approach for accelerating the discovery of microwave dielectric ceramics with good temperature stability.
{"title":"Machine learning assisted τf value prediction of ABO3-type microwave dielectric ceramics","authors":"Mingyue Yang , Liangyu Mo , Jincheng Qin , Faqiang Zhang , Mingsheng Ma , Yongxiang Li , Zhifu Liu","doi":"10.1016/j.jmat.2025.101117","DOIUrl":"10.1016/j.jmat.2025.101117","url":null,"abstract":"<div><div>The temperature coefficient of resonance frequency (<em>τ</em><sub>f</sub> or TCF) is the key parameter for evaluating temperature stability of microwave dielectric ceramics. In this work, a machine learning framework was proposed to predict the <em>τ</em><sub>f</sub> values of ABO<sub>3</sub>-type microwave dielectric ceramics. Leveraging a curated dataset of 104 single-phase ABO<sub>3</sub>-type compounds, we systematically evaluated models based on five machine learning algorithms using 31 structural descriptors as input features. The eXtreme Gradient Boosting (XGB) algorithm emerged as the optimal predictive model, demonstrating robust performance on the test set (<em>R</em><sup>2</sup> = 0.7799, RMSE = 15.7494 × 10<sup>−6</sup> °C<sup>−1</sup>). Consistent results on the validation set further confirmed its generalization capability. Critical features contributing to the model's performance include molecular dielectric polarizability (<em>p</em><sub>m</sub>), tolerance factor (<em>t</em><sub>t</sub>), ionic volume (<em>V</em><sub>i</sub>) and relative molecular mass (<em>m</em>). Structure-property relationship studies revealed that the <em>pm</em> plays an important role in modulating the <em>τ</em><sub>f</sub> value by affecting the permittivity. Quantitative thresholds for these critical descriptors were also derived for identifying materials with near-zero <em>τ</em><sub>f</sub>. This work provides an effective data-driven approach for accelerating the discovery of microwave dielectric ceramics with good temperature stability.</div></div>","PeriodicalId":16173,"journal":{"name":"Journal of Materiomics","volume":"12 1","pages":"Article 101117"},"PeriodicalIF":9.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144797432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01Epub Date: 2025-06-04DOI: 10.1016/j.jmat.2025.101095
Xin Liu , Fan Zhang , Ji Zou , Weimin Wang , Wei Ji , Zhengyi Fu
The nacreous layer of shells has become an excellent biomimetic template of materials due to its unique structure. Inspired by the highly complex multilayered structure of shells, biomimetic layered composite protective materials with outstanding strength, toughness, and impact resistance have been developed. As the hard phase in biomimetic pearlescent layered protective materials, ceramics suffer from inherent low toughness. Applying prestress proved to be an efficient method to enhance their toughness and impact resistance. In this study, prestressed biomimetic periodic laminated (TiB2TiB)/Ti protective materials were fabricated with spark plasma sintering (SPS) technology under the conditions of 1450 °C and 30 MPa in an argon atmosphere. Moreover, both experimental and numerical simulation analyses were conducted to investigate their protective performance. Compared to non-prestressed protective materials, the prestressed constrained materials exhibited the significantly improved protective performance with reduced penetration depth, substantially lower residual velocity, and kinetic energy after impact. This study provided valuable insights into the structural design and performance optimization of other protective materials.
{"title":"Biomimetic multi-layered protective materials with prestress and a periodic laminated structure","authors":"Xin Liu , Fan Zhang , Ji Zou , Weimin Wang , Wei Ji , Zhengyi Fu","doi":"10.1016/j.jmat.2025.101095","DOIUrl":"10.1016/j.jmat.2025.101095","url":null,"abstract":"<div><div>The nacreous layer of shells has become an excellent biomimetic template of materials due to its unique structure. Inspired by the highly complex multilayered structure of shells, biomimetic layered composite protective materials with outstanding strength, toughness, and impact resistance have been developed. As the hard phase in biomimetic pearlescent layered protective materials, ceramics suffer from inherent low toughness. Applying prestress proved to be an efficient method to enhance their toughness and impact resistance. In this study, prestressed biomimetic periodic laminated (TiB<sub>2</sub><img>TiB)/Ti protective materials were fabricated with spark plasma sintering (SPS) technology under the conditions of 1450 °C and 30 MPa in an argon atmosphere. Moreover, both experimental and numerical simulation analyses were conducted to investigate their protective performance. Compared to non-prestressed protective materials, the prestressed constrained materials exhibited the significantly improved protective performance with reduced penetration depth, substantially lower residual velocity, and kinetic energy after impact. This study provided valuable insights into the structural design and performance optimization of other protective materials.</div></div>","PeriodicalId":16173,"journal":{"name":"Journal of Materiomics","volume":"12 1","pages":"Article 101095"},"PeriodicalIF":9.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144218682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01Epub Date: 2025-06-04DOI: 10.1016/j.jmat.2025.101094
Qingfeng Li , Jie Li , Ying Tang , Huaicheng Xiang , Di Zhou , Kaixin Song , Liang Fang
The low dielectric constant (εr < 15) is the key to improving the signal transmission speed of microwave communication devices. However, the resonant frequency temperature coefficient (τf) of most low-εr microwave dielectric ceramics is usually negative. Aiming to modify the large negative τf of scheelite CaWO4 and explore the underlying mechanism between the structure and microwave dielectric properties, a series of Ca1–x(Li1/2Eu1/2)xWO4 (x = 0.1−1.0) (CLEWOx) ceramics were prepared at low sintering temperatures (750−875 °C). The εr increased from 10.46 to 18.55, and the Q× f decreased from 39,032 GHz–7425 GHz, mainly due to the enhanced rattling effect of Li+. The τf rapidly increased from negative (−19.91 × 10−6 °C−1) to abnormally positive (+162.15 × 10−6 °C−1), influenced by the reduced temperature coefficient of ion polarizability (ταm) caused by the rattling Li + cation. The CLEWO0.15 sample has good comprehensive performance (εr = 12.28, Q×f = 28,027 GHz, and τf = −0.5 × 10−6 °C−1) and compatibility with the Ag electrode, showing the potential of LTCC applications. Additionally, a dielectric resonator antenna based on CLEWO0.15 ceramic was designed with a bandwidth of 254 MHz at 4.504−4.758 GHz and a gain of 4.87 dBi at 4.62 GHz, indicating that CLEWO0.15 may be a potential candidate for dielectric resonator antennas.
{"title":"Rattling effect mechanism on the temperature stability of low-sintered Ca1–x(Li1/2Eu1/2)xWO4 microwave dielectric ceramics for dielectric resonant antenna applications","authors":"Qingfeng Li , Jie Li , Ying Tang , Huaicheng Xiang , Di Zhou , Kaixin Song , Liang Fang","doi":"10.1016/j.jmat.2025.101094","DOIUrl":"10.1016/j.jmat.2025.101094","url":null,"abstract":"<div><div>The low dielectric constant (<em>ε</em><sub>r</sub> < 15) is the key to improving the signal transmission speed of microwave communication devices. However, the resonant frequency temperature coefficient (<em>τ</em><sub>f</sub>) of most low-<em>ε</em><sub>r</sub> microwave dielectric ceramics is usually negative. Aiming to modify the large negative <em>τ</em><sub>f</sub> of scheelite CaWO<sub>4</sub> and explore the underlying mechanism between the structure and microwave dielectric properties, a series of Ca<sub>1–<em>x</em></sub>(Li<sub>1/2</sub>Eu<sub>1/2</sub>)<sub><em>x</em></sub>WO<sub>4</sub> (<em>x</em> = 0.1−1.0) (CLEWO<sub><em>x</em></sub>) ceramics were prepared at low sintering temperatures (750−875 °C). The <em>ε</em><sub>r</sub> increased from 10.46 to 18.55, and the <em>Q</em>× <em>f</em> decreased from 39,032 GHz–7425 GHz, mainly due to the enhanced rattling effect of Li<sup>+</sup>. The <em>τ</em><sub>f</sub> rapidly increased from negative (−19.91 × 10<sup>−6</sup> °C<sup>−1</sup>) to abnormally positive (+162.15 × 10<sup>−6</sup> °C<sup>−1</sup>), influenced by the reduced temperature coefficient of ion polarizability (<em>τ</em><sub>αm</sub>) caused by the rattling Li <sup>+</sup> cation. The CLEWO<sub>0.15</sub> sample has good comprehensive performance (<em>ε</em><sub>r</sub> = 12.28, <em>Q×f</em> = 28,027 GHz, and <em>τ</em><sub>f</sub> = −0.5 × 10<sup>−6</sup> °C<sup>−1</sup>) and compatibility with the Ag electrode, showing the potential of LTCC applications. Additionally, a dielectric resonator antenna based on CLEWO<sub>0.15</sub> ceramic was designed with a bandwidth of 254 MHz at 4.504−4.758 GHz and a gain of 4.87 dBi at 4.62 GHz, indicating that CLEWO<sub>0.15</sub> may be a potential candidate for dielectric resonator antennas.</div></div>","PeriodicalId":16173,"journal":{"name":"Journal of Materiomics","volume":"12 1","pages":"Article 101094"},"PeriodicalIF":9.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144218690","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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