Phase relations in the oxygen rich region of the Cr--W--O ternary system

Journal Article · Sat Nov 01 04:00:00 EST 1975 · Mater. Res. Bull., v. 10, no. 11, pp. 1175-1180

DOI:https://doi.org/10.1016/0025-5408(75)90023-9· OSTI ID:4051723

Ekstroem, T; Tilley, R J.D.

The phases occurring in the ternary Cr--W--O system at 1370$sup 0$K have been determined using x-ray diffraction and electron and optical microscopy. It was found that at this temperature no Cr enters WO$sub 3$ or the other tungsten oxides and no ternary CS phases appear to form. Instead, the Cr reacts to form one or two ternary rutile phases and equilibrium lies between them and the appropriate binary tungsten oxide. The compositions of these ternary oxides are Cr$sub 2$WO$sub 6$ and a previously unreported phase CrWO$sub 4$. No extended homogeneity ranges have been detected for these oxides. A phase diagram summarizes the results which are also considered in the light of the formation of crystallographic shear phases in tungsten oxides. (auth)

• Research Organization: Univ. of Stockholm
• Sponsoring Organization: USDOE
• NSA Number: NSA-33-023698
• OSTI ID: 4051723
• Journal Information: Mater. Res. Bull., v. 10, no. 11, pp. 1175-1180, Journal Name: Mater. Res. Bull., v. 10, no. 11, pp. 1175-1180; ISSN MRBUA
• Country of Publication: United States
• Language: English

Related Subjects

*CHROMIUM OXIDES-- PHASE DIAGRAMS
*TUNGSTEN OXIDES-- PHASE DIAGRAMS
360202* --Materials--Ceramics
Cermets & Refractories-- Structure & Phase Studies
BINARY MIXTURES
CRYSTALLOGRAPHY
N50130* --Metals
Ceramics
& Other Materials--Ceramics & Cermets--Properties
Structure & Phase Studies
SHEAR
TUNGSTATES
VERY HIGH TEMPERATURE