High pressure structure of Tb2Ti2O7 pyrochlore at cryogenic temperatures

Autor:	Andrew Cornelius, Ravhi S. Kumar, Maddury Somayazulu, Jason S. Gardner, Daniel Errandonea, Malcolm Nicol
Rok vydání:	2007
Předmět:	Diffraction Equation of state Bulk modulus Chemistry Pyrochlore Synchrotron radiation Thermodynamics Advanced Photon Source Crystal structure engineering.material Condensed Matter Physics Electronic Optical and Magnetic Materials Crystallography High pressure engineering
Zdroj:	physica status solidi (b). 244:266-269
ISSN:	1521-3951 0370-1972
DOI:	10.1002/pssb.200672558
Popis:	The structure of Th 2 Ti 2 O 7 pyrochlore was investigated at high pressures up to 24 GPa at cryogenic temperatures down to 6.5 K using angular dispersive X-ray diffraction with synchrotron radiation at HPCAT, Advanced Photon Source. The cell parameters were obtained by performing full profile Rietveld refinements of the diffraction data. The equation of state is obtained at low temperatures by fitting the pressure-volume data to a second order Birch Murnaghan eqation and a bulk modulus value of 168(4) GPa is obtained. The results show persistance of the pyrochlore structure up to the maximum pressure studied in the experiment and further indicate that pressure induces solely magnetic ordering which do not involve crystal symmetry changes.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::f85e0c24b0ab4a23952f99e7eef8ba99 https://doi.org/10.1002/pssb.200672558 Zobrazit plný text záznamu Plný text