酸化物系フラックスを用いたSr_<0.5>Ba_<0.5>Nb_2O_6単結晶の育成

概要

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Sr_<0.5>Ba_<0.5>Nb_2O_6(SBN) single crystal with various oxide fluxes was grown by flux cooling method. The results were as follows. (1) SBN single crystal was only grown in binary of SrB_4O_7-BaB_4O_7 flux. The maximum size of the obtained SEN single crystal was over 1 mm. (2) The SBN single crystal obtained in binary flux had following properties. Curie point was 95℃. Electric resistivity was 3.0×10^8Ω・cm at room temperature. Activation energy was 0.97 eV in ferroelectric phase and 0.16 eV in paraelectric phase. (3) From additive of MgO in binary flux, SBN single crystal was changed to colorless and transparent. For the lattice constant, a axis was increased but c axis was decreased in dependence on amount of added MgO. Electric resistivity of the MgO doped SBN crystal was higher value than that of the MgO undoped SBN crystal. (4) SBN single crystal was not grown in respective simple oxide fluxes. Pb_5Nb_4O_<15> crystal was formed in PbO flux. Ba_3Nb_<10> O_<28> and Sr_2Nb_2O_7 crystals were formed m CuO flux. Na_<0.5>Sr_<0.25>NbO_3 crystal was formed in Na_2B_4O_7 flux.
社団法人日本セラミックス協会の論文
1990-02-01