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

Journal Article · Fri Apr 01 00:00:00 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), Vol. 23:11; Other Information: Translated from Izv. Akad. Nauk SSSR, Neorg. Mater.; 23, No. 11, 1875-1880 (Nov 1987)
• Country of Publication: United States
• Language: English

Related Subjects

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