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La 2 Ti 2 O 7 Ceramics
Author(s) -
Fuierer Paul A.,
Newnham Robert E.
Publication year - 1991
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1991.tb06857.x
Subject(s) - materials science , calcination , microstructure , scanning electron microscope , dielectric , sintering , ceramic , molten salt , lanthanum , thermal decomposition , chemical engineering , composite material , mineralogy , diffraction , phase (matter) , metallurgy , optics , inorganic chemistry , chemistry , biochemistry , physics , optoelectronics , organic chemistry , engineering , catalysis
La 2 Ti 2 O 7 powders were prepared using three different techniques. Single‐phase material was obtained at 1150°C by calcination of mixed oxides, at 1000°C by molten salt synthesis, and at 850°C by evaporative decomposition of solutions. Particle sizes and morphologies of the powders differed substantially, as did the sintered microstructures and dielectric properties. Very dense (99%), translucent, grain‐oriented lanthanum titanate was fabricated by hot‐forging at 1300°C under a 200‐kg load. Anisotropy was demonstrated by X‐ray diffraction, scanning electron microscopy, thermal expansion, and dielectric measurements.