Pressure-induced structural transition and metallization in MnSe2

被引：3
作者：
Wang, Baoyun [1 ,2 ]
Wang, Xiaoning [1 ,2 ]
Wang, Simeng [1 ,2 ]
Tan, Dayong [3 ]
Xiao, Wansheng [3 ]
Liang, Wen [4 ]
Song, Maoshuang [1 ]
机构：
[1] Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China
[2] Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
[3] Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Mineral & Metallogeny, Guangzhou 510640, Peoples R China
[4] Chinese Acad Sci, Inst Geochem, Key Lab High Temp & High Pressure Study Earths In, Guiyang 550081, Peoples R China
来源：
PHYSICS AND CHEMISTRY OF MINERALS | 2020年 / 47卷 / 09期
基金：
中国国家自然科学基金;
关键词：
Manganese diselenide (MnSe2); Arsenopyrite-type structure; Disordered intermediate; Large volume collapse; Pressure-induced metallization; X-RAY-DIFFRACTION; INDUCED PHASE-TRANSITION; MAGNETIC-PROPERTIES; VOLUME COLLAPSE; SPIN-STATE; PYRITE; MNTE2; DICHALCOGENIDES; ARSENOPYRITE; FES2;
D O I：
10.1007/s00269-020-01111-9
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The high-pressure behavior of manganese diselenide MnSe2 was investigated by synchrotron angle-dispersive X-ray diffraction (ADXRD) and infrared reflection spectroscopy equipped with a diamond-anvil cell. It was found that MnSe2 with a pyrite-type structure undergoes a transformation into a disordered intermediate phase at similar to 12.5 GPa, with a ground state composed of an arsenopyrite-type structure, as confirmed by laser-heating treatment. The pyrite to arsenopyrite phase transition was found to be coupled to a large collapse in the unit-cell volume (increment V similar to 19%) and an electronic transition from a high-spin to low-spin state for manganese cations (Mn2+). With a fixed value for the pressure derivation of the bulk modulusK' = 4, fitting of the pressure-volume data to a second-order Birch-Murnaghan equation of state yielded isothermal bulk modulus values of K-0 = 56.1(9) GPa and K-0 = 93.1(4) GPa for the pyrite-type and arsenopyrite-type phases, respectively. The measured infrared reflectivity (R-sd) for MnSe2 showed a drastic increase at pressures between 13 and 20 GPa, but became insensitive to pressure under further compression, implying a pressure-induced transition from an insulator to metallic state.
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页数：10
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