Pressure-induced phase transformation of CsPbI3 by X-ray diffraction and Raman spectroscopy

被引：72
作者：
Yuan, Guan [1 ]
Qin, Shan [1 ]
Wu, Xiang [2 ]
Ding, Hongrui [1 ]
Lu, Anhuai [1 ]
机构：
[1] Peking Univ, Sch Earth & Space Sci, Key Lab Orogen Belts & Crustal Evolut, Minist Educ, Beijing, Peoples R China
[2] China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan, Hubei, Peoples R China
来源：
PHASE TRANSITIONS | 2018年 / 91卷 / 01期
基金：
中国国家自然科学基金;
关键词：
CsPbI3; X-ray diffraction; Raman spectroscopy; diamond anvil cell; phase transformation; HYBRID PEROVSKITES; INORGANIC PEROVSKITE; CESIUM; TRANSITIONS;
D O I：
10.1080/01411594.2017.1357180
中图分类号：
O7 [晶体学];
学科分类号：
0702 ; 070205 ; 0703 ; 080501 ;
摘要：
The structural transformation of cesium lead iodine (CsPbI3) has been investigated in diamond anvil cells up to similar to 15 GPa at room temperature by employing synchrotron radiation X-ray diffraction and Raman spectroscopy. One reversible transformation from orthorhombic (Pnma) to monoclinic (P2(1)/m) phase has been observed at 3.9 GPa. Isothermal pressure-volume relationship of orthorhombic CsPbI3 is well fitted by the third-order Birch-Murnaghan equation of state with K-0 = 14(3) GPa, K'(0) = 6(2) and V-0 = 891(7) angstrom(3). The ultralow value of bulk modulus K-0 demonstrates the high compressible nature of CsPbI3, similar to those of organic-inorganic metal halide perovskites. The present results provide essential information on the intrinsic properties and stability of CsPbI3, which may be applied in photovoltaic devices.
引用
收藏
页码：38 / 47
页数：10
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