ELECTRON-PARAMAGNETIC-RESONANCE IN PYROLUSITE AND CRYPTOMELANE MANGANESE DIOXIDES

Authors
ANANTH MV DAKSHINAMURTHI K
Citation
Mv. Ananth et K. Dakshinamurthi, ELECTRON-PARAMAGNETIC-RESONANCE IN PYROLUSITE AND CRYPTOMELANE MANGANESE DIOXIDES, Journal of materials chemistry, 7(3), 1997, pp. 517-520
Citations number
20
Categorie Soggetti
Chemistry Physical","Material Science
Journal title
Journal of materials chemistry → ACNP
ISSN journal
09599428
Volume
7
Issue
3
Year of publication
1997
Pages
517 - 520
Database
ISI
SICI code
0959-9428(1997)7:3<517:EIPACM>2.0.ZU;2-B
Abstract
Electron paramagnetic resonance spectroscopy has been applied to ident ify the singular structural features of pyrolusite (beta) and cryptome lane (alpha) manganese dioxides. At 77 K, the derivative linewidth of pyrolusite is reduced to that of cryptomelane and the M(S) = -3/2 spin states in cryptomelane are affected by the changes in crystal field. Isothermal heating of cryptomelane in air at 100 degrees C for two day s affects the M(s) = -5/2 and M(s) = -3/2 levels. The results seem to confirm the partial collapse of the lattice due to release of molecula r water on heating.