Phase transitions and ferroelectric behavior in Pb5M3O9F10(M=Mo, W) and phase transition in Pb5Ti3O3F16

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Phase transitions and ferroelectric behavior in Pb5M3O9F10(M=Mo, W) and phase transition in Pb5Ti3O3F16

机译：Pb5M3O9F10（M = Mo，W）中的相变和铁电行为以及Pb5Ti3O3F16中的相变

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Two new nonlinear optic lead transition‐metal oxyfluorides have been prepared and characterized. Pb5W3O9F10 is tetragonal with a=14.583(3), c=7.365(1) Å and nonlinear dielectric susceptibility d33=0.025(5)10-12 V-1 m. The atomic arrangement permits reversal of the spontaneous polarization, with resulting maximum atomic displacements along the polar axis of about 0.4 Å. The Curie temperature predicted on the basis of the tungsten and associated oxygen atom displacements is about 840 K. The experimental phase transition temperature is 785(15) K. The dielectric permittivity reaches a maximum of 2.4×107 at 805(10) K as the loss tangent passes through a minimum. Pb5Mo3O9F10 is isostructural with Pb5W3O9F10 and exhibits similar properties. The PbF2–MoO3 system contains five distinct and newly characterized phases: cubic Pb1-xMoxO3xF2-2x with 0≤x≤0.15, orthorhombic Pb3MoO3F6 with distorted fluorite‐type structure, the closely related α and β phases of tetragonal Pb5Mo3O9F10, and tetragonal PbMoO3F2. Pb5Ti3O3F16 is isostructural with Pb5W3O9F10, with a phase transition at 780(10) K and d33≪10-16 V-1 m.

机译：已经制备并表征了两种新的非线性光学铅过渡金属氟氧化物。 Pb5W3O9F10是a = 14.583（3），c = 7.365（1）Å和非线性介电常数d33 = 0.025（5）10-12 V-1 m的四边形。原子排列可逆转自发极化，导致沿极轴的最大原子位移约为0.4。根据钨和相关的氧原子位移预测的居里温度约为840K。实验的相变温度为785（15）K。在805（10）K时，介电常数最大为2.4×107。损耗角正切通过最小值。 Pb5Mo3O9F10与Pb5W3O9F10是同构的，并且表现出相似的特性。 PbF2-MoO3系统包含五个不同且新近表征的相：0≤x≤0.15的立方Pb1-xMoxO3xF2-2x，萤石型结构扭曲的斜方Pb3MoO3F6，四方Pb5Mo3O9F10和四方PbMoO3F2紧密相关的α和β相。 Pb5Ti3O3F16与Pb5W3O9F10同构，在780（10）K和d33≪10-16 V-1 m处具有相变。

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《Journal of Applied Physics》 |1986年第1期|P.357-360|共4页
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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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Phase transitions and ferroelectric behavior in Pb5M3O9F10(M=Mo, W) and phase transition in Pb5Ti3O3F16

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