Accession Number : AD0699677

Title :   THE CRYSTAL STRUCTURE OF alpha-Ca2P2O7,

Corporate Author : MCMASTER UNIV HAMILTON (ONTARIO)

Personal Author(s) : Calvo,C.

Report Date : 06 DEC 1967

Pagination or Media Count : 7

Abstract : The high-temperature form of calcium pyrophosphate, alpha-Ca2P2O7, crystallizes in the monoclinic space group P2(1)/n. The structure is closely related to that of alpha-Sr2P2O7, although the latter has orthorhombic symmetry. Both cations show coordination numbers of eight with average cation-oxygen atom bond lengths of 2.54 and 2.51 A for the individual cation sites. The structure was refined by a full-matrix least-squares procedure using 1416 reflections whose intensities were estimated visually. The final value for the conventional R value is 0.098. The diffraction pattern shows a marked orthorhombic character suggesting a high-temperature phase with Pbnm symmetry. (Author)

Descriptors :   (*PHOSPHATES, *CRYSTAL STRUCTURE), CALCIUM COMPOUNDS, X RAY DIFFRACTION, CANADA

Subject Categories : Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE