Taketo Kowaki, W. Matsumura, Koki Hanasaku, Ryo Okuno, Daisuke Inahara, S. Matsuda, S. Kurai, Yongzhao Yao, Y. Ishikawa, N. Okada, Y. Yamada
The nitrogen‐polar (N‐polar) AlGaN/AlN structure is expected to have higher carrier density than conventional metal‐polar AlGaN/GaN electronic devices, and the AlN substrate offers various advantages, such as high breakdown voltage and high‐temperature operation. Herein, a N‐polar AlGaN/AlN‐heterostructured field‐effect transistor (FET) with static FET characteristics is successfully fabricated. However, the drain current density, IDS, remains significantly small. This study aims to improve IDS by doping Si in the topmost AlGaN channel layer under various conditions.
{"title":"Si‐Doping Effects in AlGaN Channel Layer on Performance of N‐Polar AlGaN/AlN FETs","authors":"Taketo Kowaki, W. Matsumura, Koki Hanasaku, Ryo Okuno, Daisuke Inahara, S. Matsuda, S. Kurai, Yongzhao Yao, Y. Ishikawa, N. Okada, Y. Yamada","doi":"10.1002/pssa.202200872","DOIUrl":"https://doi.org/10.1002/pssa.202200872","url":null,"abstract":"The nitrogen‐polar (N‐polar) AlGaN/AlN structure is expected to have higher carrier density than conventional metal‐polar AlGaN/GaN electronic devices, and the AlN substrate offers various advantages, such as high breakdown voltage and high‐temperature operation. Herein, a N‐polar AlGaN/AlN‐heterostructured field‐effect transistor (FET) with static FET characteristics is successfully fabricated. However, the drain current density, IDS, remains significantly small. This study aims to improve IDS by doping Si in the topmost AlGaN channel layer under various conditions.","PeriodicalId":87717,"journal":{"name":"Physica status solidi (A): Applied research","volume":"24 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90321191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Ozen, A. Karabiber, Sevinc Sener, O. İpek, F. Ozel
Triboelectric nanogenerator (TENG) technology is one of the new, low‐cost, and simple methods used to convert mechanical energy into electrical energy. Despite having so many advantages, the energy efficiency of this technology is extremely low. Therefore, their current performance needs to be improved so that they can be used more in daily life. Nanofibers (NFs) are one of the most important material groups that can be used for this technology due to their large surface area–volume ratio, easy production, low cost, and simplicity. Herein, Nylon 6.6 and polyacrylonitrile are used as tribopositive and tribonegative dielectric layers, respectively. To increase the output performances of the TENG system, different weight ratios (1, 2, 3 wt%) of phthalocyanine containing zinc‐based carborane units (ZnPc) are added into the Nylon 6.6 NFs. In accordance with the obtained results, the maximum open circuit voltage and power are measured as 228 V and 7.76 mW, respectively. These results correspond for the TENG system with 1% by weight ZnPc doped into the NFs. These results show that high‐efficiency TENG systems can be obtained with nanofiber‐based dielectric layers and can be used effectively in self‐powered systems.
{"title":"Triboelectric Nanogenerator with Nanofiber Dielectric Layer Enriched through Novel Zinc Phthalocyanine Carrying Four O‐Carboranyl Units","authors":"A. Ozen, A. Karabiber, Sevinc Sener, O. İpek, F. Ozel","doi":"10.1002/pssa.202300191","DOIUrl":"https://doi.org/10.1002/pssa.202300191","url":null,"abstract":"Triboelectric nanogenerator (TENG) technology is one of the new, low‐cost, and simple methods used to convert mechanical energy into electrical energy. Despite having so many advantages, the energy efficiency of this technology is extremely low. Therefore, their current performance needs to be improved so that they can be used more in daily life. Nanofibers (NFs) are one of the most important material groups that can be used for this technology due to their large surface area–volume ratio, easy production, low cost, and simplicity. Herein, Nylon 6.6 and polyacrylonitrile are used as tribopositive and tribonegative dielectric layers, respectively. To increase the output performances of the TENG system, different weight ratios (1, 2, 3 wt%) of phthalocyanine containing zinc‐based carborane units (ZnPc) are added into the Nylon 6.6 NFs. In accordance with the obtained results, the maximum open circuit voltage and power are measured as 228 V and 7.76 mW, respectively. These results correspond for the TENG system with 1% by weight ZnPc doped into the NFs. These results show that high‐efficiency TENG systems can be obtained with nanofiber‐based dielectric layers and can be used effectively in self‐powered systems.","PeriodicalId":87717,"journal":{"name":"Physica status solidi (A): Applied research","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80618751","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Neef, M. Rossi, M. Wolf, R. Ernstorfer, H. Seiler
{"title":"On the Role of Nuclear Motion in Singlet Exciton Fission: The Case of Single‐Crystal Pentacene","authors":"A. Neef, M. Rossi, M. Wolf, R. Ernstorfer, H. Seiler","doi":"10.1002/pssa.202300304","DOIUrl":"https://doi.org/10.1002/pssa.202300304","url":null,"abstract":"","PeriodicalId":87717,"journal":{"name":"Physica status solidi (A): Applied research","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75321744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
B. S. Mpofu, Musindo R. T. Madhovi, Tanaka Majuru, K. Munjeri, Timothy Gutu
A key challenge facing fabrication of nanomaterials is the ability to precisely control the surface morphology of the nanostructures through exploitation of process parameters. In this study, palladium thin films with carefully controlled surface morphologies are obtained through the careful choice of the reducing agent used during the pre‐plating activation step in the three‐step autocatalytic electroless plating consisting of 1) surface functionalization; 2) surface activation; and 3) deposition of the film onto alumina substrates. It is important to note that the reducing agents that influenced the surface morphology of the palladium thin films are employed in the pre‐plating activation step instead of the widely utilized electroless deposition step. It is revealed in the high‐resolution scanning electron microscope results that the hydrogen reducing agent yields a dense film with 3D spheroidal morphologies with an average cluster size of ≈415 nm while the hydrazine reducing agent produces a very smooth uniform surface morphology consisting of extremely small grains. The obtained results can be exploited in controlling and tailoring the surface‐dependent properties of the palladium thin film for applications in gas sensors, detectors, or palladium‐based membranes.
{"title":"Utilizing Hydrazine and Hydrogen as Reducing Agents to Control the Nanoscale Surface Morphology of the Palladium Thin Films","authors":"B. S. Mpofu, Musindo R. T. Madhovi, Tanaka Majuru, K. Munjeri, Timothy Gutu","doi":"10.1002/pssa.202200645","DOIUrl":"https://doi.org/10.1002/pssa.202200645","url":null,"abstract":"A key challenge facing fabrication of nanomaterials is the ability to precisely control the surface morphology of the nanostructures through exploitation of process parameters. In this study, palladium thin films with carefully controlled surface morphologies are obtained through the careful choice of the reducing agent used during the pre‐plating activation step in the three‐step autocatalytic electroless plating consisting of 1) surface functionalization; 2) surface activation; and 3) deposition of the film onto alumina substrates. It is important to note that the reducing agents that influenced the surface morphology of the palladium thin films are employed in the pre‐plating activation step instead of the widely utilized electroless deposition step. It is revealed in the high‐resolution scanning electron microscope results that the hydrogen reducing agent yields a dense film with 3D spheroidal morphologies with an average cluster size of ≈415 nm while the hydrazine reducing agent produces a very smooth uniform surface morphology consisting of extremely small grains. The obtained results can be exploited in controlling and tailoring the surface‐dependent properties of the palladium thin film for applications in gas sensors, detectors, or palladium‐based membranes.","PeriodicalId":87717,"journal":{"name":"Physica status solidi (A): Applied research","volume":"180 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86811652","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Annu Yadav, P. Lohia, Sachin Singh, S. Yadav, A. Mishra, D. K. Dwivedi
A Kretschmann configuration‐based surface plasmon resonance sensor is proposed. The sensor is made up of calcium fluoride prism, silver, silicon, and tungsten di selenide nanolayer. The theoretical and numerical study of surface plasmon resonance sensor is analyzed by angle interrogation method with the help of MATLAB 2017b. The transfer matrix method (TMM) is the foundation for simulation and a monochromatic light of wavelength 633 nm is considered as source. In the proposed device structure, each layer is arranged in vertical format to improve the electrical and optical properties. The refractive index for analyte is considered as 1.330 to 1.335. Silver (Ag) metal is used for the generation of surface plasmons. It has good chemical properties like metallic conductivity, chemical stability, bandgap, small work function, and acts as an adhesive layer between calcium fluoride prism and silicon layer. To improve the molecular contact and absorption, the transition metal dichalcogenide nanofilm tungsten di selenide (WSe2) is applied at the top. The sensitivity of 367.4 deg RIU−1, detection accuracy of 0.4169 deg−1, quality factor of 193.58, and full‐width half maximum of 1.8985 deg are obtained optimized performance parameters of the proposed device structure.
{"title":"Numerical Study of Silicon and Tungsten Diselenide Nanomaterial‐Based Surface Plasmon Resonance Sensor for Refractive Index Sensing","authors":"Annu Yadav, P. Lohia, Sachin Singh, S. Yadav, A. Mishra, D. K. Dwivedi","doi":"10.1002/pssa.202300340","DOIUrl":"https://doi.org/10.1002/pssa.202300340","url":null,"abstract":"A Kretschmann configuration‐based surface plasmon resonance sensor is proposed. The sensor is made up of calcium fluoride prism, silver, silicon, and tungsten di selenide nanolayer. The theoretical and numerical study of surface plasmon resonance sensor is analyzed by angle interrogation method with the help of MATLAB 2017b. The transfer matrix method (TMM) is the foundation for simulation and a monochromatic light of wavelength 633 nm is considered as source. In the proposed device structure, each layer is arranged in vertical format to improve the electrical and optical properties. The refractive index for analyte is considered as 1.330 to 1.335. Silver (Ag) metal is used for the generation of surface plasmons. It has good chemical properties like metallic conductivity, chemical stability, bandgap, small work function, and acts as an adhesive layer between calcium fluoride prism and silicon layer. To improve the molecular contact and absorption, the transition metal dichalcogenide nanofilm tungsten di selenide (WSe2) is applied at the top. The sensitivity of 367.4 deg RIU−1, detection accuracy of 0.4169 deg−1, quality factor of 193.58, and full‐width half maximum of 1.8985 deg are obtained optimized performance parameters of the proposed device structure.","PeriodicalId":87717,"journal":{"name":"Physica status solidi (A): Applied research","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80886058","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Congying Ding, Le Wang, Rabiul Islam, Shouheng Zhang, Xia Wang, Hongli Li, W. He, Xing-hua Zhu, Zhao Yao, Zhejun Jin, Guoxia Zhao, Yong Peng, G. Miao, Shandong Li
Theoretically, tetragonal lattice distortion of FeCo epitaxial films can result in a very large in‐plane magnetic anisotropy field, leading to an extremely high ferromagnetic resonance (FMR) frequency. Herein, Fe 75 Co 25 $left(text{Fe}right)_{75} left(text{Co}right)_{25}$ thin films are epitaxially grown on (001) MgAl2O4 single‐crystal substrates. A triclinic lattice distortion with a ≠ b ≠ c $a neq b neq c$ , instead of a tetragonal one, is found in the FeCo films. The cubic symmetry breaking leads to a deviation of easy axes from the 100 $100$ directions, forming a distribution of magnetic moments with a strong perpendicular magnetic anisotropy (PMA) along the out‐of‐plane [001] directions and a deviation of the in‐plane components from the ([10 100]) directions. The effective field of the former is as high as 1.5–2.5 T, enough to overcome the thin film shape anisotropy, while that of the latter stays at a low value of around 0.05 T. The strain‐induced PMA gradually relaxes to in‐plane for thicker films with a strained sublayer remaining. As a result, an extremely high out‐of‐plane FMR frequency over 40 GHz is achieved, accompanied by a lower in‐plane FMR frequency around 8 GHz. This study provides a possible approach to prepare self‐biased soft magnetic films with extremely high‐resonance frequency for applications in microwave‐integrated circuits.
从理论上讲，FeCo外延膜的四方晶格畸变会导致非常大的面内磁各向异性场，从而导致极高的铁磁共振(FMR)频率。本文中，Fe 75 Co 25 $left(text{Fe}right)_{75} left(text{Co}right)_{25}$薄膜被外延生长在(001)MgAl2O4单晶衬底上。在FeCo薄膜中发现了A≠b≠c $a neq b neq c$的三斜晶格畸变，而不是四方晶格畸变。立方对称破缺导致易轴偏离100 $100$方向，形成沿面外[001]方向具有强垂直磁各向异性(PMA)的磁矩分布，面内分量偏离([10 100])方向。前者的有效场高达1.5-2.5 T，足以克服薄膜形状的各向异性，而后者的有效场保持在0.05 T左右的低值。应变诱导的PMA在较厚的薄膜中逐渐松弛到平面内，并留下一个应变亚层。因此，实现了超过40 GHz的极高面外FMR频率，同时伴随着8 GHz左右的较低面内FMR频率。该研究提供了一种可能的方法来制备具有极高谐振频率的自偏置软磁薄膜，用于微波集成电路。
{"title":"Extremely High Ferromagnetic Resonance Frequency Induced by Triclinic Lattice Distortion in Epitaxial FeCo/MgAl2O4 (001) Films","authors":"Congying Ding, Le Wang, Rabiul Islam, Shouheng Zhang, Xia Wang, Hongli Li, W. He, Xing-hua Zhu, Zhao Yao, Zhejun Jin, Guoxia Zhao, Yong Peng, G. Miao, Shandong Li","doi":"10.1002/pssa.202300438","DOIUrl":"https://doi.org/10.1002/pssa.202300438","url":null,"abstract":"Theoretically, tetragonal lattice distortion of FeCo epitaxial films can result in a very large in‐plane magnetic anisotropy field, leading to an extremely high ferromagnetic resonance (FMR) frequency. Herein, Fe 75 Co 25 $left(text{Fe}right)_{75} left(text{Co}right)_{25}$ thin films are epitaxially grown on (001) MgAl2O4 single‐crystal substrates. A triclinic lattice distortion with a ≠ b ≠ c $a neq b neq c$ , instead of a tetragonal one, is found in the FeCo films. The cubic symmetry breaking leads to a deviation of easy axes from the 100 $100$ directions, forming a distribution of magnetic moments with a strong perpendicular magnetic anisotropy (PMA) along the out‐of‐plane [001] directions and a deviation of the in‐plane components from the ([10 100]) directions. The effective field of the former is as high as 1.5–2.5 T, enough to overcome the thin film shape anisotropy, while that of the latter stays at a low value of around 0.05 T. The strain‐induced PMA gradually relaxes to in‐plane for thicker films with a strained sublayer remaining. As a result, an extremely high out‐of‐plane FMR frequency over 40 GHz is achieved, accompanied by a lower in‐plane FMR frequency around 8 GHz. This study provides a possible approach to prepare self‐biased soft magnetic films with extremely high‐resonance frequency for applications in microwave‐integrated circuits.","PeriodicalId":87717,"journal":{"name":"Physica status solidi (A): Applied research","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78119661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ram Sevak Singh, R. D. Patidar, Ashutosh Kumar Singh, Kalim Deshmukh, K. Thakur, A. Gautam
This article reports a simple thermal annealing‐assisted direct synthesis method to prepare copper oxide (CuO) nanoparticles incorporated in polyvinyl alcohol (PVA) films and a systematic study of their optical properties. CuO‐PVA nanocomposite films are prepared with a different weight percentage of CuO in the PVA matrix. Scanning electron microscopy (SEM), X‐ray diffraction (XRD), UV‐visible spectroscopy, and photoluminescence spectroscopy are employed to study the prepared films. XRD confirms the formation of crystalline CuO nanoparticles in PVA, while the SEM analysis shows uniformly distributed spherical nanoparticles in PVA. The findings show that thermal annealing at a mild temperature plays a crucial role in improving the crystallinity and optical properties of the nanocomposite film. In comparison to PVA, CuO‐PVA nanocomposite exhibits improved absorption with a new absorption band in the lower wavelength region. The nanocomposite samples excited with 300 nm show intense photoluminescence (PL) at 365 nm and an increase of PL intensity with CuO concentration in the PVA matrix. In contrast, samples excited with 425 nm show green emission at 550 nm in the visible region of the electromagnetic spectrum. The PL in CuO‐PVA nanocomposites can be originated due to the transitions associated with acceptor and donor defects in the material. The study opens up a new route to fabricate CuO‐PVA nanocomposites with superior optical properties.
{"title":"Simple Thermal Annealing‐Assisted Direct Synthesis and Optical Property Study of CuO Nanoparticles Incorporated Polyvinyl Alcohol Films","authors":"Ram Sevak Singh, R. D. Patidar, Ashutosh Kumar Singh, Kalim Deshmukh, K. Thakur, A. Gautam","doi":"10.1002/pssa.202300328","DOIUrl":"https://doi.org/10.1002/pssa.202300328","url":null,"abstract":"This article reports a simple thermal annealing‐assisted direct synthesis method to prepare copper oxide (CuO) nanoparticles incorporated in polyvinyl alcohol (PVA) films and a systematic study of their optical properties. CuO‐PVA nanocomposite films are prepared with a different weight percentage of CuO in the PVA matrix. Scanning electron microscopy (SEM), X‐ray diffraction (XRD), UV‐visible spectroscopy, and photoluminescence spectroscopy are employed to study the prepared films. XRD confirms the formation of crystalline CuO nanoparticles in PVA, while the SEM analysis shows uniformly distributed spherical nanoparticles in PVA. The findings show that thermal annealing at a mild temperature plays a crucial role in improving the crystallinity and optical properties of the nanocomposite film. In comparison to PVA, CuO‐PVA nanocomposite exhibits improved absorption with a new absorption band in the lower wavelength region. The nanocomposite samples excited with 300 nm show intense photoluminescence (PL) at 365 nm and an increase of PL intensity with CuO concentration in the PVA matrix. In contrast, samples excited with 425 nm show green emission at 550 nm in the visible region of the electromagnetic spectrum. The PL in CuO‐PVA nanocomposites can be originated due to the transitions associated with acceptor and donor defects in the material. The study opens up a new route to fabricate CuO‐PVA nanocomposites with superior optical properties.","PeriodicalId":87717,"journal":{"name":"Physica status solidi (A): Applied research","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73433820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Flexible transparent electrodes are prerequisites of next‐generation electronic devices. Most of the synthesis process of conventional transparent conducting oxides (TCOs) require high vacuum and high temperature, which hinder its application in flexible devices. Colloidal TCO nanocrystals (NCs) can be potential candidates in this regard. But till date, the electrical performances are not promising for commercial applications. Therefore, a detailed understanding of synthesis, electrical transport, and challenges is required for further development of colloidal NC‐based transparent electrode. Herein, notable works with emphasis on synthesis, postsynthesis modification, along with film deposition techniques are summarized. The comparative studies of electrical performance of promising TCO materials with its thin‐film counterpart are presented to draw future prospects of TCO NCs as commercial transparent electrodes.
{"title":"Transparent Conducting Oxide Nanocrystals: Synthesis, Challenges, and Future Prospects for Optoelectronic Devices","authors":"Averi Guha, Tapas K. Paira, Sanjit Sarkar","doi":"10.1002/pssa.202300351","DOIUrl":"https://doi.org/10.1002/pssa.202300351","url":null,"abstract":"Flexible transparent electrodes are prerequisites of next‐generation electronic devices. Most of the synthesis process of conventional transparent conducting oxides (TCOs) require high vacuum and high temperature, which hinder its application in flexible devices. Colloidal TCO nanocrystals (NCs) can be potential candidates in this regard. But till date, the electrical performances are not promising for commercial applications. Therefore, a detailed understanding of synthesis, electrical transport, and challenges is required for further development of colloidal NC‐based transparent electrode. Herein, notable works with emphasis on synthesis, postsynthesis modification, along with film deposition techniques are summarized. The comparative studies of electrical performance of promising TCO materials with its thin‐film counterpart are presented to draw future prospects of TCO NCs as commercial transparent electrodes.","PeriodicalId":87717,"journal":{"name":"Physica status solidi (A): Applied research","volume":"94 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75657170","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Huan-Yeuh Chu, G. Hao, Puguang Ji, Jianjun Zhang, Tianyuan Zheng, Qingzhou Wang
Porous Cu–Al–Ni shape memory alloys (SMAs) are fabricated via powder metallurgy method using Cu, Al, Ni powders and Cu–Al–Ni alloy powder as raw materials, respectively. It is found that the two kinds of specimens have similar macroscopic morphologies: connected pores are uniformly distributed in the Cu–Al–Ni matrix, forming a 3D network structure. By comparison, the specimen fabricated using alloy powder has much finer microstructures than the specimens fabricated using Cu, Al, Ni powders. After adding Ce element to the latter, the microstructure of the Cu–Al–Ni matrix is significantly refined because of the formation of Ce‐rich particles. Damping tests show that the latter has superior damping capacity than the former. With the increase of Ce content, the damping of the latter increases first and then decreases. When the Ce content reaches 0.05 wt%, the highest damping can be achieved. Correlated mechanisms are discussed based on the microstructural observations.
以Cu、Al、Ni粉末和Cu - Al - Ni合金粉末为原料，采用粉末冶金法制备了多孔Cu - Al - Ni形状记忆合金。结果发现，两种试样具有相似的宏观形貌:连通孔隙均匀分布在Cu-Al-Ni基体中，形成三维网状结构。通过比较，合金粉末制备的试样比Cu、Al、Ni粉末制备的试样具有更精细的显微组织。在Cu-Al-Ni基体中加入Ce元素后，Cu-Al-Ni基体的微观结构明显细化，形成了富Ce颗粒。阻尼试验表明，后者的阻尼能力优于前者。随着Ce含量的增加，后者的阻尼先增大后减小。当Ce含量达到0.05 wt%时，阻尼达到最大。根据微观结构观察，讨论了相关机理。
{"title":"Fabrication and Damping Property of Porous Cu–Al–Ni Shape Memory Alloys Fabricated using Different Raw Materials","authors":"Huan-Yeuh Chu, G. Hao, Puguang Ji, Jianjun Zhang, Tianyuan Zheng, Qingzhou Wang","doi":"10.1002/pssa.202300229","DOIUrl":"https://doi.org/10.1002/pssa.202300229","url":null,"abstract":"Porous Cu–Al–Ni shape memory alloys (SMAs) are fabricated via powder metallurgy method using Cu, Al, Ni powders and Cu–Al–Ni alloy powder as raw materials, respectively. It is found that the two kinds of specimens have similar macroscopic morphologies: connected pores are uniformly distributed in the Cu–Al–Ni matrix, forming a 3D network structure. By comparison, the specimen fabricated using alloy powder has much finer microstructures than the specimens fabricated using Cu, Al, Ni powders. After adding Ce element to the latter, the microstructure of the Cu–Al–Ni matrix is significantly refined because of the formation of Ce‐rich particles. Damping tests show that the latter has superior damping capacity than the former. With the increase of Ce content, the damping of the latter increases first and then decreases. When the Ce content reaches 0.05 wt%, the highest damping can be achieved. Correlated mechanisms are discussed based on the microstructural observations.","PeriodicalId":87717,"journal":{"name":"Physica status solidi (A): Applied research","volume":"46 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73654901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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