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Phase transitions of Fe$_2$O$_3$ under laser shock compression

Fuente: arXiv

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Detalles Bibliográficos
Autores principales:	Amouretti, A., Crépisson, C., Azadi, S., Cabaret, D., Campbell, T., Chin, D. A., Colin, B., Collins, G. R., Crandall, L., Fiquet, G., Forte, A., Gawne, T., Guyot, F., Heighway, P., Lee, H., McGonegle, D., Nagler, B., Pintor, J., Polsin, D., Rousse, G., Shi, Y., Smith, E., Wark, J. S., Vinko, S. M., Harmand, M.
Formato:	Preprint
Publicado:	2024
Materias:	Materials Science
Acceso en línea:	Acceder al recurso
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

_version_	1866908672155713536
author	Amouretti, A. Crépisson, C. Azadi, S. Cabaret, D. Campbell, T. Chin, D. A. Colin, B. Collins, G. R. Crandall, L. Fiquet, G. Forte, A. Gawne, T. Guyot, F. Heighway, P. Lee, H. McGonegle, D. Nagler, B. Pintor, J. Polsin, D. Rousse, G. Shi, Y. Smith, E. Wark, J. S. Vinko, S. M. Harmand, M.
author_facet	Amouretti, A. Crépisson, C. Azadi, S. Cabaret, D. Campbell, T. Chin, D. A. Colin, B. Collins, G. R. Crandall, L. Fiquet, G. Forte, A. Gawne, T. Guyot, F. Heighway, P. Lee, H. McGonegle, D. Nagler, B. Pintor, J. Polsin, D. Rousse, G. Shi, Y. Smith, E. Wark, J. S. Vinko, S. M. Harmand, M.
contents	We present in-situ x-ray diffraction and velocity measurements of Fe$_2$O$_3$ under laser shock compression at pressures between 38-116 GPa. None of the phases reported by static compression studies were observed. Instead, we observed an isostructural phase transition from $α$-Fe$_2$O$_3$ to a new $α^\prime$-Fe$_2$O$_3$ phase at a pressure of 50-62 GPa. The $α^\prime$-Fe$_2$O$_3$ phase differs from $α$-Fe$_2$O$_3$ by an 11% volume drop and a different unit cell compressibility. We further observed a two-wave structure in the velocity profile, which can be related to an intermediate regime where both $α$ and $α^\prime$ phases coexist. Density functional theory calculations with a Hubbard parameter indicate that the observed unit cell volume drop can be associated with a spin transition following a magnetic collapse.
format	Preprint
id	arxiv_https___arxiv_org_abs_2402_18432
institution	arXiv
publishDate	2024
record_format	arxiv
spellingShingle	Phase transitions of Fe$_2$O$_3$ under laser shock compression Amouretti, A. Crépisson, C. Azadi, S. Cabaret, D. Campbell, T. Chin, D. A. Colin, B. Collins, G. R. Crandall, L. Fiquet, G. Forte, A. Gawne, T. Guyot, F. Heighway, P. Lee, H. McGonegle, D. Nagler, B. Pintor, J. Polsin, D. Rousse, G. Shi, Y. Smith, E. Wark, J. S. Vinko, S. M. Harmand, M. Materials Science We present in-situ x-ray diffraction and velocity measurements of Fe$_2$O$_3$ under laser shock compression at pressures between 38-116 GPa. None of the phases reported by static compression studies were observed. Instead, we observed an isostructural phase transition from $α$-Fe$_2$O$_3$ to a new $α^\prime$-Fe$_2$O$_3$ phase at a pressure of 50-62 GPa. The $α^\prime$-Fe$_2$O$_3$ phase differs from $α$-Fe$_2$O$_3$ by an 11% volume drop and a different unit cell compressibility. We further observed a two-wave structure in the velocity profile, which can be related to an intermediate regime where both $α$ and $α^\prime$ phases coexist. Density functional theory calculations with a Hubbard parameter indicate that the observed unit cell volume drop can be associated with a spin transition following a magnetic collapse.
title	Phase transitions of Fe$_2$O$_3$ under laser shock compression
topic	Materials Science
url	https://arxiv.org/abs/2402.18432