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A Galvanic Cell Study Of the Ni-W-O System in the Temperature Range 1034-1317 K
KTH, Tidigare Institutioner                               , Metallurgi.
1994 (engelsk)Inngår i: Journal of Chemical Thermodynamics, ISSN 0021-9614, E-ISSN 1096-3626, Vol. 26, nr 5, s. 493-505Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
1994. Vol. 26, nr 5, s. 493-505
Emneord [en]
INTERMETALLIC PHASE; SYSTEM
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-12278DOI: 10.1006/jcht.1994.1059OAI: oai:DiVA.org:kth-12278DiVA, id: diva2:307593
Merknad
QC 20100401Tilgjengelig fra: 2010-04-01 Laget: 2010-04-01 Sist oppdatert: 2017-12-12bibliografisk kontrollert
Inngår i avhandling
1. Thermodynamic studies of some high temperature systems
Åpne denne publikasjonen i ny fane eller vindu >>Thermodynamic studies of some high temperature systems
1997 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
sted, utgiver, år, opplag, sider
Stockholm: Institutionen för tillämpad processmetallurgi, 1997. s. 162
Serie
Trita-MET ; 97:187
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-2593 (URN)91-7170-202-4 (ISBN)
Disputas
1997-12-05, 00:00 (engelsk)
Merknad
QC 2010-05-04Tilgjengelig fra: 2000-01-01 Laget: 2000-01-01 Sist oppdatert: 2010-05-04bibliografisk kontrollert

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