Field sums for extended dipoles in ferroelectric polymers
作者:
R. Al‐Jishi,
P. L. Taylor,
期刊:
Journal of Applied Physics
(AIP Available online 1985)
卷期:
Volume 57,
issue 3
页码: 897-901
ISSN:0021-8979
年代: 1985
DOI:10.1063/1.334689
出版商: AIP
数据来源: AIP
摘要:
A previously described method for calculating the Lorentz factorLfor orthorhombic polar crystals is modified to allow discussion of dipoles of finite size. In this approach, the field due to a lattice of point charges ±qseparated by a distancedis calculated. The Lorentz factor, which relates the field at a lattice site to the macroscopic polarization, is found as a function of the dipole lengthd, and is seen to vary appreciably with changes in the separation between the charges. Assumption of a value of 1/3 forLcan thus lead to significant errors in determining the self‐consistent polarization of crystals consisting of polarizable molecules.
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