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Crystals 2019, 9(1), 2;

LiCrO2 Under Pressure: In-Situ Structural and Vibrational Studies

High Pressure and Synchrotron Radiation Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India
Departamento de Física Aplicada-ICMUV, MALTA Consolider Team, Universidad de Valencia, Edificio de Investigación, C/Dr. Moliner 50, Burjassot, 46100 Valencia, Spain
Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
CELLS-ALBA Synchrotron Light facility, 08290 Cerdanyola, Barcelona, Spain
Luminescent Materials Laboratory, Department of Biotechnology, University of Verona and INSTM, UdR Verona, Strada Le Grazie, 15371 34 Verona, Italy
Author to whom correspondence should be addressed.
Received: 1 December 2018 / Revised: 16 December 2018 / Accepted: 17 December 2018 / Published: 20 December 2018
(This article belongs to the Section Crystalline Materials)
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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. View Full-Text
Keywords: high-pressure; X-ray diffraction; Raman spectroscopy; equation of state high-pressure; X-ray diffraction; Raman spectroscopy; equation of state

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Garg, A.B.; Errandonea, D.; Pellicer-Porres, J.; Martinez-Garcia, D.; Kesari, S.; Rao, R.; Popescu, C.; Bettinelli, M. LiCrO2 Under Pressure: In-Situ Structural and Vibrational Studies. Crystals 2019, 9, 2.

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