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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.116  No.1358 (October) (2008)  >  pp.1108-1114

Journal of the Ceramic Society of Japan
<<Previous article Vol.116  No.1358 (October) (2008)   pp.1108 - 1114 Next article>>

Comprehensive study of crystallization and phase formation in (La,Gd)BGeO5 glass

Yoshihiro TAKAHASHI1), Yasuhiko BENINO2), Takumi FUJIWARA1) and Takayuki KOMATSU3)
1) Department of Applied Physics, Tohoku University
2) Graduate School of Environmental Science, Okayama University
3) Department of Materials Science and Technology, Nagaoka University of Technology


  The glasses with (25-x)La2O3·xGd2O3·25B2O3·50GeO2 composition corresponding to the (La,Gd)BGeO5 were prepared, and the substitution effect of gadolinium ions (Gd3+) on crystallization behavior and phase formation was examined by DTA, XRD and Raman techniques in detail. Ferroelectric (La,Gd)BGeO5 phase with hexagonal stillwellite structure were crystallized in the composition range of x = 0-15. Although no significant change in physical properties was observed in the whole composition range, crystallization behavior was drastically changed as the progressive substitution of Gd3+ was carried out (i.e., crystallization of monoclinic phase of (La,Gd)BGeO5 and high-pressure phase of Gd2Ge2O7 with a triclinic structure). Structure of the glasses and crystallized phases, and the phase formation mechanism were also discussed.


Keyword:
Stillwellite, LaBGeO5, Glass, Crystallization, Phase formation

Received: June 11, 2008
Accepted: September 11, 2008 , Published online: October 01, 2008
Copyright (c) 2008 The Ceramic Society of Japan

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