OXYGEN NONSTOICHIOMETRY OF (ND2 3CE1/3)(4)(BA2/3ND1/3)(4)CU6O16+X/

Authors
PATRAKEEV MV LEONIDOV IA LAKHTIN AA KOZHEVNIKOV VL NIKOLAEV AV
Citation
Mv. Patrakeev et al., OXYGEN NONSTOICHIOMETRY OF (ND2 3CE1/3)(4)(BA2/3ND1/3)(4)CU6O16+X/, Journal of solid state chemistry, 120(1), 1995, pp. 146-150
Citations number
8
Categorie Soggetti
Chemistry Inorganic & Nuclear","Chemistry Physical
Journal title
Journal of solid state chemistry → ACNP
ISSN journal
00224596
Volume
120
Issue
1
Year of publication
1995
Pages
146 - 150
Database
ISI
SICI code
0022-4596(1995)120:1<146:ONO(3>2.0.ZU;2-0
Abstract
The equilibrium oxygen content of (Nd2/3Ce1/3)(4)(Ba-2/3 Nd-1/3)(4)Cu6 O16+x was measured by coulomeric titration in the temperature range 55 0-820 degrees C and at oxygen pressures between 10(-3) and 1 atm. From the results, the partial molar enthalpy and entropy of oxygen were ca lculated as functions of the oxygen content. The data were explained b ased on a point defects model and the equilibrium constants of the red ox and charge disproportionation reactions involved were derived. A ph ase transition near the point x approximate to 1.83, which nominally c orresponds to one trivalent copper cation per elementary unit, was obs erved. (C) 1995 Academic Press,Inc.