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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.121  No.1409 (January) (2013)  >  pp.74-79

Journal of the Ceramic Society of Japan
<<Previous article Vol.121  No.1409 (January) (2013)   pp.74 - 79 Next article>>

Low temperature synthesis of ATiO3 (A: Mg, Ca, Sr, Ba) by using molten salt

Nobuhiro KUMADA1), Akira MIURA1), Takahiro TAKEI1), Indri Badria ADILINA2), Syogo SHIMAZU2)
1) Department of Research Interdisciplinary Graduate School of Medicine and Engineering Center for Crystal Science and Technology, University of Yamanashi 2) Graduate School of Engineering, Chiba University

Alkaline earth metal titanates ATiO3 (A: Mg, Ca, Sr, Ba) were prepared from two types of layered potassium titanates [K2Ti2O5 and K0.6Ti1.85O4 (hereafter, Lss)] by using alkaline earth metal molten salts [ACl2 + A(NO3)2 (1:1)]. For A = Ca a single phase of perovskite-type compound was prepared at 600°C by using both starting compounds and the reaction temperature was lower than in 400°C that of the solid state reaction with TiO2 (anatase) and CaCO3. A single phase of perovskite-type SrTiO3 was obtained at 600 and 700°C for K2Ti2O5 and Lss, respectively and these temperatures were much lower than that (1200°C) of the solid state reaction with TiO2 (anatase) and SrCO3. In the case of perovskite-type BaTiO3 a single phase of perovskite-type compound was prepared at 700°C by using both starting compounds and also this temperature was much lower than that (above 1300°C) of the solid state reaction with TiO2 (anatase) and BaCO3. Although neither K2Ti2O5 nor Lss could produce a single phase of ilmenite-type MgTiO3, it was prepared by the solid state reaction with TiO2 (anatase) and magnesium basic carbonate at 900°C. A single phase of ilmenite-type CdTiO3 was prepared from K2Ti2O5 by using cadmium molten salts [CdCl2 + Cd(NO3)2 (1:1)] at 500°C. By taking account of the fact that ilmenite-type CdTiO3 transforms to perovskite-type structure, this preparative method using layered potassium titanates with molten salts preferred to crystallize perovskite-type titanates at lower temperature rather than ilmenite-type ones.


Keyword:
Alkaline earth metal titanates, Molten salt, Layered potassium titanate

Received: July 30, 2012
Accepted: October 29, 2012 , Published online: January 01, 2013
Copyright © 2013 The Ceramic Society of Japan

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