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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.121  No.1409 (January) (2013)  >  pp.21-25

Journal of the Ceramic Society of Japan
<<Previous article Vol.121  No.1409 (January) (2013)   pp.21 - 25 Next article>>

Synthesis of (NH4)2XLa1−XSrX[Fe(CN)6]·nH2O from two heteronuclear complexes La[FeIII(CN)6]·5H2O and (NH4)2Sr[FeII(CN)6] by mechanochemical process

Hiromichi AONO1), Tomoya KAN1), Yoshiteru ITAGAKI1), Ken-ichi YAMAGUCHI2), Shun ITOH2), Masato KURIHARA2), Masatomi SAKAMOTO2)
1) Materials Science and Biotechnology, Graduate School of Science and Engineering, Ehime University 2) Material and Biological Chemistry, Graduate School of Science and Engineering, Yamagata University

A heteronuclear (NH4)2Sr[FeII(CN)6] complex having a tetragonal phase was synthesized from Sr(NO3)2 and (NH4)4[FeII(CN)6]·nH2O. A single phase of the heteronuclear (NH4)2XLa1−XSrX[Fe(CN)6]·nH2O complex was synthesized by the coprecipitation for two heteronuclear hexacyano complexes of La[FeIII(CN)6]·5H2O and (NH4)2Sr[FeII(CN)6]. In this chemical method, the X value (Sr content) for the complex was lower than that of the starting material. This (NH4)2XLa1−XSrX[Fe(CN)6]·nH2O complex was also obtained by a mechanochemical reaction using a planetary ball-mill for two complexes (Total 0.01 mol = ca. 4 g) of (1 − X)La[FeIII(CN)6]·5H2O and X(NH4)2Sr[FeII(CN)6] with a small amount (5 ml) of methanol. The hydration number calculated from the elemental analysis agreed with the estimated values when a hexagonal single (NH4)0.8La0.6Sr0.4[Fe(CN)6]·4.2H2O phase formed for X = 0.4. This reaction for X = 0.4 was also possible for the dry process without methanol. In the case of X > 0.4, the peaks of the SrFe- complex were observed in the XRD pattern. The perovskite phase was directly formed by the thermal decomposition at a low temperature for the milled X = 0.4 complex.


Keyword:
Mechanochemical reaction, Heteronuclear complex, La[Fe(CN)6]·5H2O, (NH4)2Sr[Fe(CN)6], X-ray diffraction, La1−XSrXFeO3

Received: July 23, 2012
Accepted: September 28, 2012 , Published online: January 01, 2013
Copyright © 2013 The Ceramic Society of Japan

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