SMALL POLARON INTERPRETATION OF BATIO3 TRANSPORT PROPERTIES FROM DRIFT MOBILITY MEASUREMENTS
SMALL POLARON INTERPRETATION OF BATIO3 TRANSPORT PROPERTIES FROM DRIFT MOBILITY MEASUREMENTS
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DOI：
10.1088/0022-3719/12/3/021
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发表时间：
1979-01-01
期刊：
影响因子：
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通讯作者：
MICHELCALENDINI, FM
中科院分区：
文献类型：
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作者：
BOYEAUX, JP;MICHELCALENDINI, FM
用Spear方法测定了熔融生长BaTiO_3单晶在20~80℃温度范围内的漂移迁移率模数。室温下，mod=(3+或-1)×10-7m2V-1 S-1，电阻率为4×108欧姆，迁移率为0.15+或-0.04 eV。在半经典和量子力学情况下，用非绝热小极化子跳跃理论解释了这一结果。推导了相关的极化子和能带参数，考虑到LO声子能量h(交叉)omega0，半带宽J在0.03-0.06 eV之间。得到了霍尔迁移率、Seebeck系数和吸收系数随参数h(Cross)omega0、Ea和J的变化关系，并与已有的实验数据进行了比较。
The drift mobility mu d of melt-grown BaTiO 3 single crystals has been determined in the 20 degrees C to 80 degrees C temperature range, using the Spear method. At room temperature, mu d=(3+ or-1)* 10-7 m 2 V-1 s-1 with a resistivity of 4* 10 8 Omega m. The mobility thermally activated with an activation energy of 0.15+ or-0.04 eV. The results are interpreted in terms of non-adiabatic small-polaron hopping theory in the semi-classical and quantum mechanical cases. The related polaron and band parameters are deduced; taking into account the LO phonon energy h (cross) omega 0, the half-bandwidth J lies between 0.03 and 0.06 eV. Hall mobility, Seebeck coefficient and absorption coefficient are obtained as functions of parameters h (cross) omega 0, E a and J and compared with existing experimental data.