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A Galvanic Cell Study Of the Ni-W-O System in the Temperature Range 1034-1317 K
KTH, Superseded Departments, Metallurgy.
1994 (English)In: Journal of Chemical Thermodynamics, ISSN 0021-9614, E-ISSN 1096-3626, Vol. 26, no 5, 493-505 p.Article in journal (Refereed) Published
Abstract [en]

Experimental studies of the standard molar Gibbs free energy of formation of NiWO4 have been carried out using a solid-state galvanic cell involving (zirconium oxide + calcium oxide) electrolyte in the temperature range T = 1034 K to 1317 K. The galvanic cell used can be represented as

-Pt|{(1 - δ)Ni + δW}(f.c.c.), NiWO4(s), WO2.72(s)|(1 - x)ZrO2 + x CaO|NiO(s), Ni(s)|Pt+,

where δ « 1. The e.m.f. against temperature plot shows a break at T ≈ 1167 K, indicating a possible phase transformation occurring in the ternary mixture. These studies were complemented by X-ray-diffraction studies of some ternary mixtures equilibrated at T = 1073 K and 1273 K. A thermodynamic assessment of (nickel + tungsten + oxygen) was carried out as part of the present work, incorporating the present results along with those available in the literature for the ternary as well as the three binaries involved. The isothermal sections at T = 1073 K and 1273 K are presented.

Place, publisher, year, edition, pages
1994. Vol. 26, no 5, 493-505 p.
Keyword [en]
INTERMETALLIC PHASE; SYSTEM
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:kth:diva-12278DOI: 10.1006/jcht.1994.1059OAI: oai:DiVA.org:kth-12278DiVA: diva2:307593
Note
QC 20100401Available from: 2010-04-01 Created: 2010-04-01 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Thermodynamic studies of some high temperature systems
Open this publication in new window or tab >>Thermodynamic studies of some high temperature systems
1997 (English)Doctoral thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: Institutionen för tillämpad processmetallurgi, 1997. 162 p.
Series
Trita-MET, 97:187
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-2593 (URN)91-7170-202-4 (ISBN)
Public defence
1997-12-05, 00:00 (English)
Note
QC 2010-05-04Available from: 2000-01-01 Created: 2000-01-01 Last updated: 2010-05-04Bibliographically approved

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