POWDER NEUTRON-DIFFRACTION STUDY OF PYROLUSITE, BETA-MNO2

Authors
BOLZAN AA FONG C KENNEDY BJ HOWARD CJ
Citation
Aa. Bolzan et al., POWDER NEUTRON-DIFFRACTION STUDY OF PYROLUSITE, BETA-MNO2, Australian Journal of Chemistry, 46(6), 1993, pp. 939-944
Citations number
18
Categorie Soggetti
Chemistry
Journal title
Australian Journal of Chemistry → ACNP
ISSN journal
00049425
Volume
46
Issue
6
Year of publication
1993
Pages
939 - 944
Database
ISI
SICI code
0004-9425(1993)46:6<939:PNSOPB>2.0.ZU;2-W
Abstract
The powder neutron diffraction pattern of pyrolusite, beta-MnO2 [P4(2) /mnm, No. 136, a = 4.4041(1), c = 2.8765(1) angstrom], has been refine d by the Rietveld method to give values for both the oxygen position p arameter u = 0.3046(1) and the anisotropic thermal parameters. The dat a confirm the MnO6 octahedra to be elongated with two long [1.894(1) a ngstrom] and four short [1.882(2) angstrom] Mn-O bond distances. The e ffect of the stereochemistry on the thermal vibrations is discussed.