A WIDE-ANGLE X-RAY-SCATTERING (WAXS) STUDY OF NONSTOICHIOMETRIC NICKEL MANGANITE SPINELS NIMN2-SQUARE-O-3-DELTA 4(4+DELTA)/

Authors
LABERTY C VERELST M LECANTE P ALPHONSE P MOSSET A ROUSSET A
Citation
C. Laberty et al., A WIDE-ANGLE X-RAY-SCATTERING (WAXS) STUDY OF NONSTOICHIOMETRIC NICKEL MANGANITE SPINELS NIMN2-SQUARE-O-3-DELTA 4(4+DELTA)/, Journal of solid state chemistry, 129(2), 1997, pp. 271-276
Citations number
18
Categorie Soggetti
Chemistry Inorganic & Nuclear","Chemistry Physical
Journal title
Journal of solid state chemistry → ACNP
ISSN journal
00224596
Volume
129
Issue
2
Year of publication
1997
Pages
271 - 276
Database
ISI
SICI code
0022-4596(1997)129:2<271:AWX(SO>2.0.ZU;2-M
Abstract
WAXS study of highly divided oxides obtained by low temperature decomp osition of mixed oxalates NiMn2(C2O4)(3) . nH(2)O in air at low temper atures (573 and 623 K) shows that oxalate decomposition leads probably directly to the spinel structure NiMn2 rectangle(3 delta/4)O(4+delta) with a very high content of cation vacancies essentially located in t etrahedral sites. Thermogravimetric analyses confirm that these oxides have a great nonstoichiometry proportion; the higher value (delta app roximate to 0.9) is observed for the compound synthesized at 573 K. (C ) 1997 Academic Press.