La₂Ti₂O₇ Ceramics

Abstract

LaZTi207 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. [

Study on properties of tantalum-dopedLa2Ti2O7ferroelectric ceramics

“…The highest Curie temperatures have been found in some perovskite-like layer structured (PLS) ferroelectrics with a general formula of A 2 B 2 O 7 , such as La 2 Ti 2 O 7 (T c $ 1461 C), Nd 2 Ti 2 O 7 (T c $ 1482 C), Sr 2 Nb 2 O 7 (T c $ 1327 C), etc. [10][11][12][13][14][15][16][17] Their super-high Curie points has stimulated considerable interests in this system. Among them, La 2 Ti 2 O 7 is a promising candidate for hightemperature piezoelectric sensors due to its piezoelectric activity and extremely high Curie point.…”

Low-Temperature Synthesis of La2Ti2O7 Nanocrystal by Metallorganic Decomposition Method

“…La 2 Ti 2 O 7 belongs to the family of perovskite layer structure compounds in monoclinic symmetry with a space group P2 1 , which is one of interesting ferroelectric substances characterized by high Curie tempera tures and coercive fields. 1) A series of new photocatalysts with layered perovskite structure such as Sr 2 2),3) The synthesis of La 2 Ti 2 O 7 has been reported using solidstate reaction (SSR), polymerized complex, sol gel, coprecipitation and hydrothermal synthesis methods.…”

Molten Salt Synthesis of Calcium Hydroxyapatite Whiskers

“…10 The MSS technique is based on the use of low-melting solvents, such as alkali chlorides, sulfates, carbonates, or hydroxides, as the medium of reaction for the ceramics. The literature on molten salt synthesis is quite extensive and, to name just a few cases, this technique has been used (with different alkali salts) to prepare ferrites, 10 titanates, [11][12][13] niobates, 14 -17 mullite, 18 aluminum borate, 19,20 wollastonite, 21 and carbonated apatite (Ca 9.8 ((PO 4 ) 5.6 (CO 3 ) 0.4 )(CO 3 ), by using a high-melting flux of CaCO 3 ). 22 The selection of the salt in MSS is critical for obtaining desirable powder morphology and characteristics.…”