Crystal structure of low-cristobalite-type Al0.5Ga 0.5PO4: A combined Rietveld refinement of neutron and X-ray diffraction data

Powder Diffraction

Volumn 20, Issue 3, 2005, Pages 207-211

  Achary, S N ^a   Tyagi, A K ^a   Kulshreshtha, S K ^a   Jayakumar, O D ^a   Krishna, P S R ^a   Shinde, A B ^a   Chakraborty, K R ^a  

^a BHABHA ATOMIC RESEARCH CENTRE   (India)

Author keywords

Cristobalite; Crystal structure; Neutron diffraction; Phosphate; Rietveld refinement; X ray diffraction

Indexed keywords

AMORPHOUS PRECIPITATE; CRISTOBALITES; CRYSTAL STRUCTURE ANALYSIS; POLYCRYSTALLINE POWDERS; POWDER X RAY DIFFRACTION; TETRAHEDRAL COORDINATION; THREE-DIMENSIONAL FRAMEWORKS; X-RAY DIFFRACTION DATA;

AMORPHOUS MATERIALS; CRYSTAL STRUCTURE; NEUTRON DIFFRACTION; PHOSPHATES; SILICATE MINERALS; X RAY DIFFRACTION;

RIETVELD REFINEMENT;

EID: 31144462337     PISSN: 08857156     EISSN: 19457413     Source Type: Journal    
DOI: 10.1154/1.1924436     Document Type: Article

References (10)

1. Achary, S. N., Jayakumar, O. D., Tyagi, A. K., and Kulshreshtha, S. K. (2003). " Preparation, phase transition and thermal expansion studies on low-cristobalite type Al1-xGaxPO4 (x=0.0, 0.20, 0.50, 0.80 and 1.00)., " J. Solid State Chem. 176, 37-46.
2. Achary, S. N., Mishra, R., Jayakumar, O. D., Tyagi, A. K., and Kulshreshtha, S. K. (2004). " On α-Β phase transition of cristobalite type Al1-xGaxPO4 (0.00≤x≤1.00). " (unpublished).
3. Evans, J. S. O., Mary, T. A., and Sleight, A. W. (1997). " Negative thermal expansion in a large molybdate and tungstate family., " J. Solid State Chem. 133, 580-583.
4. Evans, J. S. O., Mary, T. A., Vogt, T., Subramanian, M. A., and Sleight, A. W. (1996). " Negative thermal expansion in ZrW2O8 and HfW2O8., " Chem. Mater. 8, 2809-2823.
5. Hummel, F. A. (1949). " Properties of some substances isostructural with silica. " J. Am. Ceram. Soc. 32, 320-326.
6. Kulshreshtha, S. K., Jayakumar, O. D., and Sudarsan, V. (2004). " P31 and Al27 NMR study of Al1-xGaxPO4., " J. Phys. Chem. Solids 65, 1141-1146.
7. Mooney, R. C. L. (1956). " The crystal structure of aluminum phosphate and gallium Phosphate, low cristobalite type., " Acta Crystallogr. 9, 728-734.
8. Ng, H. N., and Calvo, C. (1977). " X-ray study of the twinning and phase transformation of phosphocristobalite (AlPO4)., " Can. J. Phys. 55, 677-683.
9. Perloff, A. (1956). " Temperature inversion of anhydrous gallium orthophosphate., " J. Am. Ceram. Soc. 39, 83-88.
10. Rodriguez-Carvajal, J. (2000). Fullprof 2000: A Program for Rietveld, Profile Matching and Integrated Intensity Refinements for X-ray and Neutron Data., Version 1.6, Laboratoire Leon Brillouin, Gif-sur-Yvette, France.