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Title: Structural and electronic phase transitions of Co2Te3O8 spiroffite under high pressure

Journal Article · · Physical Review B
 [1];  [2];  [3];  [1];  [1];  [4];  [4];  [5];  [1];  [1];  [1]
  1. Center for High Pressure Science and Technology Advanced Research, Shaghai (China)
  2. Univ. Hassan 1er, Settat (Morocco). Laboratoire des Sciences des Matériaux, des Milieux et de la modélisation (LS3M); Mohammed VI Polytechnic Univ., Hay Moulay Rachid, Ben Guerir (Morocco). Materials Science and Nano-Engineering
  3. Mohammed VI Polytechnic Univ., Hay Moulay Rachid, Ben Guerir (Morocco). Materials Science and Nano-Engineering
  4. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Proton Source (APS), High Pressure Collaborative Access Team (HPCAT)
  5. Uppsala Univ., Uppsala (Sweden). Dept. of Earth Sciences

The structural and electronic phase transitions of Co2Te3O8 spiroffite have been studied with a suite of in situ high-pressure characterization techniques including synchrotron x-ray diffraction, Raman, x-ray emission spectroscopy, UV-vis absorption, and electrical transport measurement. Two pressure-induced phase transitions were observed at about 6.9 and 14.4 GPa. The first transition is attributed to a small spin transition of Co along with discontinuity in unit-cell volume change, while the second one represents a first-order phase transition with a volume collapse of 4.5%. The latter transition is accompanied by the relaxation of distortion in CoO6 octahedron, which enhances the crystal-field strength inhibiting the occurrence of spin transition. What is more, the competition between contributions of electrons and oxygen ion to the overall conductivity is observed and affected by the phase transition under high pressure. Finally, this demonstration provides insights into the relationship between the lattice-structural and spin degrees of freedom, and highlights the impact of pressure on the control of structural and electronic states of a given material for optimized functionalities.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); National Natural Science Foundation of China (NSFC); National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
Grant/Contract Number:
AC02-06CH11357; FG02-99ER45775; EAR-1128799; FG02-94ER14466
OSTI ID:
1562278
Alternate ID(s):
OSTI ID: 1546303
Journal Information:
Physical Review B, Vol. 99, Issue 24; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 1 work
Citation information provided by
Web of Science

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