Effect of the rate of cooling on the phase composition of rare-earth titanates

Journal Article · Fri Apr 01 04:00:00 EST 1988 · Inorg. Mater. (Engl. Transl.); (United States)

OSTI ID:6097628

Azimov, S A; Gulamova, D D; Suleimanov, S Kh

The purpose of this work was to investigate the effect of different regimes of quenching with cooling rates of approx. 10/sup 2/ and 10/sup 5/ K/sec on the phase composition of rare-earth mono- and dititanates, as well as the possibility of formation of glasses at the nonvariant points (eutectic and peritectic) of the binary systems TiO/sub 2/-Ln/sub 2/O/sub 3/ (Ln-La, Ce, Pr, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, Lu, Y, and Sc). For compounds of the types Ln/sub 2/TiO/sub 5/ and Ln/sub 2/Ti/sub 2/O/sub 7/ (Ln-La...Lu, Y, Sc) there is a tendency for a structure with a higher symmetry to form as the ionic radius of the lanthanide decreases and the rate of quenching increases. The use of ultrarapid quenching expanded the region of existence of the cubic structure of the fluorite type to Tb/sub 2/TiO/sub 5/ and the structure of the pyrochlore type up to Sm/sub 2/Ti/sub 2/O/sub 7/. Ultrarapid quenching of compounds with the composition Ln/sub 4/Ti/sub 9/O/sub 24/ led to a transition into the amorphous state.

• Research Organization: S.V. Starodubtsev Physicotechnical Institute (USSR)
• OSTI ID: 6097628
• Journal Information: Inorg. Mater. (Engl. Transl.); (United States), Journal Name: Inorg. Mater. (Engl. Transl.); (United States) Vol. 23:11; ISSN INOMA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
CHEMICAL COMPOSITION
COHERENT SCATTERING
COOLING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DIFFRACTION
DYSPROSIUM COMPOUNDS
DYSPROSIUM OXIDES
ERBIUM COMPOUNDS
ERBIUM OXIDES
EUROPIUM COMPOUNDS
EUROPIUM OXIDES
GADOLINIUM COMPOUNDS
GADOLINIUM OXIDES
HEAT TREATMENTS
HOLMIUM COMPOUNDS
HOLMIUM OXIDES
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
LATTICE PARAMETERS
LUTETIUM COMPOUNDS
LUTETIUM OXIDES
MICROSTRUCTURE
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PRASEODYMIUM COMPOUNDS
PRASEODYMIUM OXIDES
QUENCHING
RAMAN SPECTRA
RARE EARTH COMPOUNDS
SAMARIUM COMPOUNDS
SAMARIUM OXIDES
SCANDIUM COMPOUNDS
SCANDIUM OXIDES
SCATTERING
SPECTRA
TEMPERATURE EFFECTS
TERBIUM COMPOUNDS
TERBIUM OXIDES
THULIUM COMPOUNDS
THULIUM OXIDES
TITANATES
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
YTTRIUM OXIDES