Abstract
The high-pressure behaviour of LiCrO2, a compound isostructural to the battery compound LiCoO2, has been investigated by synchrotron-based angle-dispersive X-ray powder diffraction, Raman spectroscopy, and resistance measurements up to 41, 30, and 10 Gpa, respectively. The stability of the layered structured compound on a triangular lattice with R-3m space group is confirmed in all three measurements up to the highest pressure reached. The dependence of lattice parameters and unit-cell volume with pressure has been determined from the structural refinements of X-ray diffraction patterns that are used to extract the axial compressibilities and bulk modulus by means of Birch–Murnaghan equation-of-state fits. The pressure coefficients for the two Raman-active modes, A1g and Eg, and their mode-Grüneisen parameters are reported. The electrical resistance measurements indicate that pressure has little influence in the resistivity up to 10 GPa. The obtained results for the vibrational and structural properties of LiCrO2 under pressure are in line with the published results of the similar studies on the related compounds. Research work reported in this article contributes significantly to enhance the understanding on the structural and mechanical properties of LiCrO2 and related lithium compounds.
Highlights
Layered ABO2 transition-metal oxides, where A (B) is an alkali or noble metal (3d transition metal), have attracted considerable interest due to the wide variety of attributes that are exhibited by them [1,2,3,4].The major crystal structures adopted by these compounds is either delafossite or α−NaFeO2 -type structure, which belong to space group R-3m
We report the influence of pressure at ambient temperature on the structural, vibrational, and electrical properties of LiCrO2
These properties were investigated by synchrotron X-ray diffraction, Raman spectroscopy, and electrical resistance measurements up to 41, 30, and 10 Gpa, respectively
Summary
Layered ABO2 transition-metal oxides, where A (B) is an alkali or noble metal (3d transition metal), have attracted considerable interest due to the wide variety of attributes that are exhibited by them [1,2,3,4]. The compounds with A as noble metal (Cu, Ag, Au) adopt the delafossite structure, forming a family of materials showing a rare combination of electrical conductivity and optical transparency widely known as transparent conducting oxides [6,7]. These compounds find a plethora of technological. We report the influence of pressure at ambient temperature on the structural, vibrational, and electrical properties of LiCrO2 These properties were investigated by synchrotron X-ray diffraction, Raman spectroscopy, and electrical resistance measurements up to 41, 30, and 10 Gpa, respectively. The pressure dependence of two expected Raman modes, along with their Gruneisen parameter, has been obtained
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