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Pressure-induced amorphization of the Y3Ga5O12 garnet studied to 1 Mbar

Abstract: We use micro-beam synchrotron x-ray diffraction to study the pressure-induced amorphization of nano-sized and single crystals of Y3Ga5O12 up to pressures exceeding 1 Mbar in static compression. The abrupt pressure-induced amorphization found for both 56 nm and bulk micrometric crystals at around 76 GPa independently of the pressure transmitting medium employed demonstrates its intrinsic nature, previously predicted at 79 GPa by ab initio calculations. The single crystal structural solution at 50 GPa shows that the contraction of the unit-cell, mostly accommodated by the compressible YO8 dodecahedra, gives rise to a regularization and tilting increase of the GaO6 polyhedra with the Y?O-Ga angle changing from 104.84° to 102.34° in 50 GPa. We obtain a bulk modulus of 178(3) GPa for the single crystal and 172(3) GPa for the nanocrystals in excellent agreement with previous calculations.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Fuente: Journal of Alloys and Compounds 830 (2020) 15467

Editorial: Elsevier Ltd

 Fecha de publicación: 01/07/2020

Nº de páginas: 8

Tipo de publicación: Artículo de Revista

 DOI: 10.1016/j.jallcom.2020.154678

ISSN: 0925-8388,1873-4669

Proyecto español: PGC-2018-097520-A-100

Url de la publicación: https://doi.org/10.1016/j.jallcom.2020.154678