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Japanese Journal of Applied Physics最新文献

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Room temperature synthesis of BaTiO3 nanoparticles using titanium bis(ammonium lactato) dihydroxide 利用双（乳酸铵）二氢氧化钛在室温下合成 BaTiO3 纳米粒子
IF 1.5 4区 物理与天体物理
Japanese Journal of Applied Physics Pub Date : 2024-09-12 DOI: 10.35848/1347-4065/ad70c1
Sou Yasuhara, Akira Orio, Shintaro Yasui and Takuya Hoshina
{"title":"Room temperature synthesis of BaTiO3 nanoparticles using titanium bis(ammonium lactato) dihydroxide","authors":"Sou Yasuhara, Akira Orio, Shintaro Yasui and Takuya Hoshina","doi":"10.35848/1347-4065/ad70c1","DOIUrl":"https://doi.org/10.35848/1347-4065/ad70c1","url":null,"abstract":"BaTiO3, known for its exceptional ferroelectric properties, is extensively applied in multi-layer ceramics capacitors (MLCCs). Achieving reliable, high-performance MLCCs requires sophisticated ceramics processes, notably in synthesizing submicron-order BaTiO3 powder with a narrow size distribution. Among various synthesis methods explored for submicron-size BaTiO3 powder, room temperature liquid-phase synthesis is most desirable due to its cost-effectiveness and large batch availability. In this study, we propose a synthesis method for obtaining BaTiO3 nanopowder at room temperature using titanium bis(ammonium lactato) dihydroxide and Ba(OH)2·8H2O as starting materials, reacted in tert-butylamine with NaOH and ethanol. The resulting powder, exhibiting a cubic phase of BaTiO3 with an average particle size of 35.8 nm, was obtained after a 7-day reaction at room temperature. Characterization involved X-ray diffraction, differential thermal analysis‒thermogravimetry, and scanning electron microscopy. Subsequently, the powder was used to sinter a BaTiO3 ceramic, whose dielectric performance was then evaluated.","PeriodicalId":14741,"journal":{"name":"Japanese Journal of Applied Physics","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142218093","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Reduction mechanism of loss tangent of scandium-doped aluminum nitride thin film by post-deposition annealing 沉积后退火降低掺钪氮化铝薄膜损耗正切的机理
IF 1.5 4区 物理与天体物理
Japanese Journal of Applied Physics Pub Date : 2024-09-11 DOI: 10.35848/1347-4065/ad7343
Akihiko Teshigahara, Tetsuya Enomoto, Hideo Yamada and Shinya Yoshida
{"title":"Reduction mechanism of loss tangent of scandium-doped aluminum nitride thin film by post-deposition annealing","authors":"Akihiko Teshigahara, Tetsuya Enomoto, Hideo Yamada and Shinya Yoshida","doi":"10.35848/1347-4065/ad7343","DOIUrl":"https://doi.org/10.35848/1347-4065/ad7343","url":null,"abstract":"Scandium-doped aluminum nitride thin films are key materials for MEMS applications including bulk acoustic wave devices for communication. Although one drawback is the increase in the loss tangent with increasing Sc concentration, the loss tangent is reported to decrease after post-deposition annealing. However, the underlying mechanisms remain unclear. In this study, we propose the hypothesis that a low-resistivity thin layer near the surface of a substrate is one of the main reasons for the high loss tangent, and that annealing enhances the resistivity, eventually decreasing the loss tangent. The reasonability of the hypothesis was successfully confirmed by analyzing the frequency response of the loss tangent using an equivalent circuit with current–voltage characteristics, cathodoluminescence, etc. This achievement represents a significant step toward advanced methods for reducing the loss tangent and its application to other thin-film materials.","PeriodicalId":14741,"journal":{"name":"Japanese Journal of Applied Physics","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142218100","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Using magneto-optical effects in soft X-ray reflectivity to study current driven magnetization reversal 利用软 X 射线反射中的磁光效应研究电流驱动的磁化反转
IF 1.5 4区 物理与天体物理
Japanese Journal of Applied Physics Pub Date : 2024-09-11 DOI: 10.35848/1347-4065/ad760b
Kiranjot, Raymond Fan, R. O. M. Aboljadayel, David M. Burn, Kalel Alsaeed, Aidan T. Hindmarch and Paul Steadman
{"title":"Using magneto-optical effects in soft X-ray reflectivity to study current driven magnetization reversal","authors":"Kiranjot, Raymond Fan, R. O. M. Aboljadayel, David M. Burn, Kalel Alsaeed, Aidan T. Hindmarch and Paul Steadman","doi":"10.35848/1347-4065/ad760b","DOIUrl":"https://doi.org/10.35848/1347-4065/ad760b","url":null,"abstract":"The soft X-ray reflectivity technique is frequently utilized for studying magnetization reversal in thin films due to its elemental and depth sensitivity. The characteristic hysteresis loops measured with this technique are dependent on both the magnetization direction in magnetic materials and the incident soft X-ray polarization. In this note, we have discussed these magneto-optical effects in soft X-ray reflectivity measurements. These effects can be exploited to probe magnetization reversal mechanisms driven by stimuli beyond conventional means of magnetic field. To demonstrate this, we have presented our investigations on current-induced magnetization switching in ferromagnet (FM)/heavy metal(HM) heterostructures.","PeriodicalId":14741,"journal":{"name":"Japanese Journal of Applied Physics","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142218108","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of oxygen content in CuO x nanofilms on chloride ion detection for ion sensor applications CuO x 纳米薄膜中的氧含量对离子传感器应用中氯离子检测的影响
IF 1.5 4区 物理与天体物理
Japanese Journal of Applied Physics Pub Date : 2024-09-11 DOI: 10.35848/1347-4065/ad7342
Yoshinari Kimura, Michihiro Sasaki and Hironori Tohmyoh
{"title":"Effect of oxygen content in CuO x nanofilms on chloride ion detection for ion sensor applications","authors":"Yoshinari Kimura, Michihiro Sasaki and Hironori Tohmyoh","doi":"10.35848/1347-4065/ad7342","DOIUrl":"https://doi.org/10.35848/1347-4065/ad7342","url":null,"abstract":"Sensors for detecting chloride ions have been required for routine monitoring of industry and human health. This study proposes a concept of an ion sensor based on CuOx nanofilms with different oxygen contents. The CuOx-based sensors exhibited an increase in DC current for those with low oxygen content and a decrease for those with high oxygen content following exposure to a chloride ion solution. AC impedance analysis suggested differential reactions of chloride ions in the bulk and surface regions of CuOx, dependent on the oxygen content. For the CuOx-based sensors with a ratio of 0.78 oxygen to copper atoms at chloride ion concentrations of 10−1000 ppm, the sensitivity in the bulk region calculated from AC impedance was 61−2926, which was higher than the sensitivity of 1.3−2.6 calculated from DC impedance. Finally, CuOx-based sensors demonstrated identifiability for chloride ions compared to sodium and calcium ions.","PeriodicalId":14741,"journal":{"name":"Japanese Journal of Applied Physics","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142218095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Capacitance reduction in AlGaN/GaN heterojunction diodes through thermally oxidized NiO anode 通过热氧化氧化镍阳极降低氮化铝/氮化镓异质结二极管的电容
IF 1.5 4区 物理与天体物理
Japanese Journal of Applied Physics Pub Date : 2024-09-10 DOI: 10.35848/1347-4065/ad6ed5
Qiuen Li, Xuanwu Kang, Hao Wu, Rikang Zhao, Yingkui Zheng, Hengyu Shang, Xinyu Liu and Chengjun Huang
{"title":"Capacitance reduction in AlGaN/GaN heterojunction diodes through thermally oxidized NiO anode","authors":"Qiuen Li, Xuanwu Kang, Hao Wu, Rikang Zhao, Yingkui Zheng, Hengyu Shang, Xinyu Liu and Chengjun Huang","doi":"10.35848/1347-4065/ad6ed5","DOIUrl":"https://doi.org/10.35848/1347-4065/ad6ed5","url":null,"abstract":"In this study, a thin barrier AlGaN/GaN heterojunction diode with a NiO anode is proposed. NiO as an anode combined with a 5 nm AlGaN barrier layer can significantly deplete two-dimensional electron gas in the anode region of the device. Combined with the etching-free technology, the damage caused by etching the AlGaN barrier layer is successfully avoided. The capacitance of the device was reduced from 28 pF mm−1 (Schottky) to 966 fF/mm (NiO) which reduced 97%. At the same time the NiO anode devices with a reverse current leakage of ~10−8 A/mm@−100V achieved a high current ON/OFF ratio of ~10-8. NiO not only reduces the capacitance and leakage of the device but also enhances its anti-collapse ability. Without using the structure of field plates, the breakdown voltage of the device was also increased compared with the Schottky diode.","PeriodicalId":14741,"journal":{"name":"Japanese Journal of Applied Physics","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142227051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Demonstration of β-(Al x Ga1−x )2O3/β-Ga2O3 superlattice growth by mist chemical vapor deposition 雾状化学气相沉积法β-(Al x Ga1-x )2O3/β-Ga2O3 超晶格生长演示
IF 1.5 4区 物理与天体物理
Japanese Journal of Applied Physics Pub Date : 2024-09-10 DOI: 10.35848/1347-4065/ad6f87
Masahiro Kaneko, Hiroki Miyake and Hiroyuki Nishinaka
{"title":"Demonstration of β-(Al x Ga1−x )2O3/β-Ga2O3 superlattice growth by mist chemical vapor deposition","authors":"Masahiro Kaneko, Hiroki Miyake and Hiroyuki Nishinaka","doi":"10.35848/1347-4065/ad6f87","DOIUrl":"https://doi.org/10.35848/1347-4065/ad6f87","url":null,"abstract":"This study demonstrates the successful growth of a β-(AlxGa1−x)2O3/β-Ga2O3 superlattice structure with six periods using mist CVD. High-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) analysis revealed that the superlattice consisted of six periods of β-(AlxGa1−x)2O3/β-Ga2O3 with an individual layer thickness of 12.9 nm and 9.1 nm, respectively. XRD analysis further confirmed the periodicity of the structure, yielding a period of 22.7 nm, which is in good agreement with the STEM result. Additionally, the Al composition was determined to be x = 0.085 based on XRD peak positions. Both atomic force microscopy and HAADF-STEM observations revealed atomically flat surfaces and sharp interfaces. This achievement highlights the potential of mist CVD for fabricating complex oxide heterostructures, offering a cost-effective and scalable alternative to conventional methods. The findings open new avenues for developing advanced electronic and optoelectronic devices based on wide-bandgap oxides.","PeriodicalId":14741,"journal":{"name":"Japanese Journal of Applied Physics","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142218096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A preliminary investigation into the potential of Ge-enhanced Cu2SnS3 (CTS) thin-film applications for water-splitting photoelectrodes 关于 Ge 增强 Cu2SnS3 (CTS) 薄膜应用于水分离光电电极潜力的初步研究
IF 1.5 4区 物理与天体物理
Japanese Journal of Applied Physics Pub Date : 2024-09-10 DOI: 10.35848/1347-4065/ad7433
Daiki Kanamori and Mutsumi Sugiyama
{"title":"A preliminary investigation into the potential of Ge-enhanced Cu2SnS3 (CTS) thin-film applications for water-splitting photoelectrodes","authors":"Daiki Kanamori and Mutsumi Sugiyama","doi":"10.35848/1347-4065/ad7433","DOIUrl":"https://doi.org/10.35848/1347-4065/ad7433","url":null,"abstract":"This study explores the potential of Ge-enhanced Cu2SnS3 (CTS) thin-films as photoelectrode materials for water splitting grown through a simple sulfurization process. The addition of Ge to CTS enabled tuning the bandgap and improved the photocurrent density. Films sulfurized at 520 °C exhibit enhanced grain size and reduced grain boundaries, which contribute to increased carrier transport efficiency. By optimizing Ge content and sulfurization conditions, the Cu2(Sn1−x,Gex)S3 films demonstrate promising capabilities for efficient green hydrogen production. This work lays the groundwork for developing advanced photoelectrodes and highlights the need for further refinement to maximize performance for practical applications.","PeriodicalId":14741,"journal":{"name":"Japanese Journal of Applied Physics","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142218105","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Low-thermal-budget crystallization of ferroelectric Al:HfO2 films by millisecond flash lamp annealing 通过毫秒闪光灯退火实现铁电 Al:HfO2 薄膜的低热预算结晶
IF 1.5 4区 物理与天体物理
Japanese Journal of Applied Physics Pub Date : 2024-09-08 DOI: 10.35848/1347-4065/ad70bf
Hideaki Tanimura, Yuma Ueno, Tomoya Mifune, Hironori Fujisawa, Seiji Nakashima, Ai I. Osaka, Shinichi Kato and Takumi Mikawa
{"title":"Low-thermal-budget crystallization of ferroelectric Al:HfO2 films by millisecond flash lamp annealing","authors":"Hideaki Tanimura, Yuma Ueno, Tomoya Mifune, Hironori Fujisawa, Seiji Nakashima, Ai I. Osaka, Shinichi Kato and Takumi Mikawa","doi":"10.35848/1347-4065/ad70bf","DOIUrl":"https://doi.org/10.35848/1347-4065/ad70bf","url":null,"abstract":"We report the use of a low-thermal-budget annealing technique; flash lamp annealing (FLA), which provides an extremely short annealing time in the millisecond range, on the ferroelectric properties of Al-doped HfO2 (HAO) films. HAO annealed at 1000 °C with 5 ms shows a higher remanent polarization value of 24.9 μC cm−2 compared to rapid thermal annealing (RTA), without degradation of endurance. GIXRD shows a stronger peak intensity originating from the orthorhombic (o-) phase and is observed when using FLA, indicating the formation of a larger amount of the o-phase. We believe that this is a consequence of the low thermal budget of FLA, and that specifically FLA can minimize the relaxation of the compressive stress in the TiN electrodes, inducing a high tensile stress to the HAO films and therefore an enhancement of o-phase formation. These results indicate that FLA is a promising annealing method for HAO crystallization due to the enhancement of o-phase formation.","PeriodicalId":14741,"journal":{"name":"Japanese Journal of Applied Physics","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2024-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142218099","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Spin-wave emission using a V-shaped antenna 利用 V 形天线发射自旋波
IF 1.5 4区 物理与天体物理
Japanese Journal of Applied Physics Pub Date : 2024-09-08 DOI: 10.35848/1347-4065/ad71d8
Ryota Yoshida, Shoki Nezu and Koji Sekiguchi
{"title":"Spin-wave emission using a V-shaped antenna","authors":"Ryota Yoshida, Shoki Nezu and Koji Sekiguchi","doi":"10.35848/1347-4065/ad71d8","DOIUrl":"https://doi.org/10.35848/1347-4065/ad71d8","url":null,"abstract":"We investigated the dynamics of spin waves in micro-patterned Permalloy thin films using time-resolved magneto-optic Kerr effect microscopy (TR-MOKE). By applying an external magnetic field, we observe the field dependence of spin wave signals with picosecond resolution. Fourier transform analysis of the signals confirms their agreement with the dispersion relation, demonstrating the successful detection of propagating spin waves using the MOKE technique. Furthermore, we perform dynamic measurements of interfering spin waves generated by a V-shaped antenna. The experimental results reveal differences in spin wave amplitude at each detection point. In combination with simulation analysis based on wave propagation from the V-shaped antenna, we reproduced the experimental results and revealed the existence of a protective zone.","PeriodicalId":14741,"journal":{"name":"Japanese Journal of Applied Physics","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2024-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142218098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Increased thermal stability by the addition of ZrO2 into a 0.48Ba(Zr0.2Ti0.8)O3-0.52(Ba0.7Ca0.3)TiO3 matrix material 通过在 0.48Ba(Zr0.2Ti0.8)O3-0.52(Ba0.7Ca0.3)TiO3 基体材料中添加 ZrO2 提高热稳定性
IF 1.5 4区 物理与天体物理
Japanese Journal of Applied Physics Pub Date : 2024-09-05 DOI: 10.35848/1347-4065/ad6c58
Alexander Martin, Naho Kato, Tobias Fey, Kyle G. Webber, Ken-ichi Kakimoto
{"title":"Increased thermal stability by the addition of ZrO2 into a 0.48Ba(Zr0.2Ti0.8)O3-0.52(Ba0.7Ca0.3)TiO3 matrix material","authors":"Alexander Martin, Naho Kato, Tobias Fey, Kyle G. Webber, Ken-ichi Kakimoto","doi":"10.35848/1347-4065/ad6c58","DOIUrl":"https://doi.org/10.35848/1347-4065/ad6c58","url":null,"abstract":"Ferroelectric ceramics based on <italic toggle=\"yes\">x</italic>(Ba<sub>0.7</sub>Ca<sub>0.3</sub>)TiO<sub>3</sub>–(1−<italic toggle=\"yes\">x</italic>)Ba(Zr<sub>0.2</sub>Ti<sub>0.8</sub>)O<sub>3</sub> (BCZT100x) are regarded as promising lead-free candidates for piezoelectric applications. Heightened piezoelectric properties are found around specific temperatures, i.e. polymorphic phase boundaries. As broader thermal stability is required for certain applications, this study aims to increase the diffusiveness of the phase transitions by introducing ZrO<sub>2</sub> as a filler material into a BCZT52 matrix. The diffuseness factor of the Curie point was evaluated and increased from approximately 1.60 to 1.88 with the addition of 4 vol% ZrO<sub>2</sub> to BCZT52. As a result, samples with an additional 2 vol% showed the highest thermal stability in the temperature range between 25 °C and 70 °C. Here, the large signal piezoelectric strain coefficient <inline-formula>\u0000<tex-math>\u0000<?CDATA ${d}_{33}^{* }$?>\u0000</tex-math>\u0000<mml:math overflow=\"scroll\"><mml:msubsup><mml:mrow><mml:mi>d</mml:mi></mml:mrow><mml:mrow><mml:mn>33</mml:mn></mml:mrow><mml:mrow><mml:mo>*</mml:mo></mml:mrow></mml:msubsup></mml:math>\u0000<inline-graphic xlink:href=\"jjapad6c58ieqn1.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> degraded only by 18%, compared to 30% in BCZT52. This increase was caused by the inhomogeneous distribution of Zr within the sample.","PeriodicalId":14741,"journal":{"name":"Japanese Journal of Applied Physics","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142218130","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","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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