タングステンブロンズ型 (Pb<sub>1-<i>X</i></sub>La<sub>2<i>X</i>/3</sub>)<sub>5</sub>Nb<sub>10</sub>O<sub>30</sub> (<i>X</i>=0.0-0.50) 新化合物のMPB現象

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  • Morphotropic Phase Boundary (MPB) of Tungsten Bronze Type New Compounds (Pb1-xLa2x/3)5Nb10O30 (X=0.0-0.50).

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The structural and ferroelectric properties of new compounds (Pb1-X2+La2X/33+)5Nb10O30 (X=0.00-0.50) were studied with respect to La3+ ion substitution of Pb2+ ion in Pb5Nb10O30 having the orthorhombic tungsten bronze structure. Phase identification shows that the structure of compounds will change from orthorhombic to tetragonal symmetry along with the increase of La3+ amount. The co-existence of two ferroelectric phases between 0.20<X<0.30 was confirmed by XRD analysis. Result of dielectric measurement also reveals the dielectric abnormality in this narrow compositional area, i.e., a rapid change of both the Curie temperature and the dielectric constant. In addition, the hysteresis loop measurement suggests that it also has significantly improved polarization properties. This set of evidences implies that the new compounds (Pb1-X2+La2X/33+)5Nb10O30 show a morphotropic phase boundary (MPB) between 0.20<X<0.30.

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