压力诱导CsCu<sub>2</sub>I<sub>3</sub>不可逆非晶化和金属化

张鸿生; 姚先祥; 吕心邓; 宋昊; 黄艳萍; 方裕强; 崔田

doi:10.11858/gywlxb.20230607

压力诱导CsCu₂I₃不可逆非晶化和金属化

doi: 10.11858/gywlxb.20230607

张鸿生^1,,
姚先祥¹,
吕心邓¹,
宋昊¹,
黄艳萍^1,*, ,,
方裕强^2,*, ,,
崔田^{1, 3,*, ,}

1.
宁波大学高压物理科学研究院, 物理科学与技术学院, 浙江宁波　315211
2.
中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室, 上海　200050
3.
吉林大学超硬材料国家重点实验室, 物理学院, 吉林长春　130012

基金项目: 国家自然科学基金（52072188）；浙江省科技创新团队项目（2021R01004）；宁波市科技计划项目（2021J121）

详细信息

作者简介:
张鸿生（1995—），男，硕士研究生，主要从事卤化物钙钛矿的高压物性研究.E-mail：2011086196@nbu.edu.cn

通讯作者:
黄艳萍（1987—），女，博士，副教授，主要从事高压下凝聚态物质结构与性质研究.E-mail：huangyanping@nbu.edu.cn

方裕强（1993—），男，博士，助理研究员，主要从事二维层状材料研究.E-mail：fangyuqiang@mail.sic.ac.cn

崔　田（1964—），男，博士，教授，主要从事高压等极端条件下新型功能材料设计与合成研究.E-mail：cuitian@nbu.edu.cn

中图分类号: O521.2
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出版历程
- 收稿日期: 2023-02-01
- 修回日期: 2023-02-05
- 网络出版日期: 2023-02-28
- 刊出日期: 2023-02-05

Pressure-Induced Irreversible Amorphization and Metallization of CsCu₂I₃

ZHANG Hongsheng^1
,,
YAO Xianxiang¹,
LYU Xindeng¹,
SONG Hao¹,
HUANG Yanping^{1,*
, ,},
FANG Yuqiang^{2,*
, ,},
CUI Tian^{1, 3,*
, ,}

1.
Institute of High Pressure Physics Science, School of Physical Science and Technology, Ningbo University, Ningbo 315211, Zhejiang, China
2.
State Key Laboratory of High-Performance Ceramics and Superﬁne Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
3.
State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, Jilin, China

摘要

摘要: 近年来，压力作用下卤化物钙钛矿的结构和性质引起了科学家们的极大兴趣。然而，对于高压下钙钛矿非晶相的潜在性质和应用仍缺乏深入系统的研究。利用金刚石对顶砧，结合原位高压同步辐射X射线衍射、原位高压拉曼光谱、高压变温电学测量技术，对准一维卤化物钙钛矿CsCu₂I₃在高压下的非晶化行为进行了系统的研究。结果表明：CsCu₂I₃在35.9 GPa以上开始出现可逆的压致非晶化，形成低密度的非晶态Ⅰ相；在更高压力下，发生由低密度到高密度的非晶转变，形成非晶态Ⅱ相，并可以截获至常压条件。进一步的电学实验表明，136.0 GPa时，CsCu₂I₃发生了由绝缘体向金属相的转变，对高压下金属相的非晶态进行卸压电阻测试，发现其金属特性至少可稳定至90.0 GPa。这些结果为进一步探索非晶钙钛矿的潜在性质和应用提供了重要的科学依据。
- 高压 /
- CsCu₂I₃ /
- 非晶化 /
- 金属化
Abstract: Exploring the structures and properties of halide perovskite under pressure have triggered great interest among scientists in recent years. However, there is still little understanding on the potential properties and applications of their amorphous phase under high pressure. In this paper, we utilized diamond anvil cell, combined with in situ high pressure synchrotron radiation X-ray diffraction, Raman spectroscopy and electrical resistance measurement to investigated the amorphization of quasi-one-dimensional halide perovskite CsCu₂I₃ under high pressure. It was observed that CsCu₂I₃ started to transform to a reversible low-density amorphous phase Ⅰ above 35.9 GPa. An irreversible high density amorphous phase Ⅱ was realized at higher pressure, which can be maintained to ambient pressure. With the application of pressure up to 136.0 GPa, the initially insulating CsCu₂I₃ transform to a metallic phase. In addition, the metallic amorphous phase Ⅱ can be preserved to at least 90.0 GPa. These results provide an important scientific basis for further exploring the potential properties and applications of amorphous perovskite.
- high pressure /
- CsCu₂I₃ /
- amorphization /
- metallization

HTML全文

图 1 (a) CsCu₂I₃的SEM图像，(b) 常压下CsCu₂I₃ 的XRD数据与PDF标准卡片对比

Figure 1. (a) SEM images of CsCu₂I₃, (b) XRD data of CsCu₂I₃ under ambient pressure compared with PDF card

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图 2 CsCu₂I₃在常压下的晶体结构(a)、0.2 GPa时衍射谱的Rietveld精修结果 (b) 以及XRD谱随压力的变化(c)

Figure 2. (a) Crystal structure of CsCu₂I₃ at ambient pressure, (b) rietveld refinement result of CsCu₂I₃ XRD pattern at 0.2 GPa, and (c) XRD patterns of CsCu₂I₃ as a function of pressure

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图 3 CsCu₂I₃的拉曼光谱随压力变化情况(a) 以及拉曼频移随压力的变化情况 (b)

Figure 3. (a) Variation of Raman spectra of CsCu₂I₃ versus pressure and (b) Raman shift versus pressure

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图 4 不同压力下CsCu₂I₃的XRD衍射环 (a) 和XRD谱 (b)

Figure 4. XRD rings (a) and patterns (b) of CsCu₂I₃ under different pressures

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图 5 CsCu₂I₃的室温电阻随压力的变化情况(a)，温度-压力-电阻三维相图(b)以及电阻随温度的变化关系(c)

Figure 5. (a) Variation of room temperature resistance versus pressure, (b) temperature-pressure-resistance three-dimensional phase diagram, and (c) pressure dependence of resistance as a function temperature for CsCu₂I₃

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图 6 CsCu₂I₃在卸压过程中的电阻与温度的变化关系

Figure 6. Temperature dependence of CsCu₂I₃ resistance during decompression

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