THE EQUILIBRIUM DIAGRAMS OF THE SYSTEMS FORMED BY GERMANIUM OXIDE WITH THE OXIDES OF ZIRCONIUM AND HAFNIUM

Journal Article · Sun Jan 01 04:00:00 EST 1961 · Bull. soc. chim. France

OSTI ID:4033172

Lefevre, J; Collongues, R

BS> Solid solutions GeO/sub 2/-AO/sub 2/ (A = Zr or Hf) were prepared by the coprecipitation method. Radiocrystallographic analysis permitted the identification of the phases present after thermal treatment between 50 and 1600 deg C. Two compounds were distinguished in each system: AGeO/sub 4/ and A/sub 3/ GeO/sub 8/. The AGeO/sub 4/ compounds have the Scheelite CaWO/sub 4/ structure with a face-centered lattice. A comparison of tbe Debye-Scherrer diagrams of HfGeO/sub 4/ and Hf/sub 3/GeO/sub 8/ show supplementary rays in the latter compound. The intensity of the rays correspond to that calculated. The diagram of Zr/sub 3/GeO/sub 8/ shows no supplementary rays with respect to that of ZrGeO/ sub 4/. An extended region of homogeneity which is temperature-independent from 1200 to 1600 deg is found at the stoichiometric composition. The equilibrium diagrams of the systems ZrO/sub 2/-GeO/sub 2/ and HfO/sub 2/-GeO/sub 2/ show three distinct monophase regions occupied by quadratic phases whose structures are simply derived from the structure of quadratic ZrO/sub 2/. (J.S.R.)

• Research Organization: C.N.R.S., Paris
• NSA Number: NSA-15-016089
• OSTI ID: 4033172
• Journal Information: Bull. soc. chim. France, Journal Name: Bull. soc. chim. France Vol. Vol: No. 1
• Country of Publication: Country unknown/Code not available
• Language: French

Related Subjects

CALCIUM OXIDES
COMPOUNDS
CRYSTALS
DIAGRAMS
GERMANIUM OXIDES
HAFNIUM OXIDES
HEAT TREATMENTS
HOMOGENEOUS REACTORS
LATTICES
METALS, CERAMICS, AND OTHER MATERIALS
NUMERICALS
PHASE DIAGRAMS
PRECIPITATION
PREPARATION
RADIOGRAPHY
SOLID SOLUTIONS
STABILITY
TUNGSTEN OXIDES
ZIRCONIUM OXIDES
ZONES