Pressure-induced structural transition in Ln2Zr2O7 (Ln = Ce, Nd, Gd) pyrochlores

Autor:	Roberto Caciuffo, Philippe E. Raison, Daniel Bouëxière, S. Heathman, S. Surblé, Karin Popa
Rok vydání:	2010
Předmět:	Lanthanide Bulk modulus Equation of state Ionic radius Chemistry Pyrochlore Analytical chemistry Mineralogy engineering.material Geochemistry and Petrology Phase (matter) X-ray crystallography engineering General Materials Science Monoclinic crystal system
Zdroj:	Physics and Chemistry of Minerals. 37:761-767
ISSN:	1432-2021 0342-1791
Popis:	The structural behavior under pressure of three lanthanide pyrochlore zirconates Ln2Zr2O7 (Ln3+ = Ce, Nd and Gd) has been investigated by X-ray diffraction up to 50 GPa. For all three compounds, a symmetry reduction from cubic to monoclinic is observed under increasing pressure dependant on a pressure value that increases with the ionic radius of the lanthanide ions, r Ln. The cubic and monoclinic phases coexist over a wide pressure range which increases with r Ln. The zero-pressure bulk modulus of the cubic phase, B 0, and its pressure derivative, B 0′, have been determined by fitting the experimental compressibility curves to the Birch–Murnaghan equation of state.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::3d5941e156db86d795a9431ed8c6725e https://doi.org/10.1007/s00269-010-0374-3 Zobrazit plný text záznamu Full text from SpringerLink