Premium
The IR‐Optical Behaviour of Polycrystalline Dielectric Films An Anisotropic Maxwell Garnett Model
Author(s) -
Lehmann Annemarie
Publication year - 1991
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221660224
Subject(s) - crystallite , anisotropy , slab , ionic bonding , dielectric , materials science , condensed matter physics , volume fraction , maxwell's equations , ellipsoid , optics , intensity (physics) , atomic packing factor , physics , optoelectronics , composite material , nuclear magnetic resonance , classical mechanics , ion , quantum mechanics , astronomy , geophysics , metallurgy
The intrinsic anisotropy associated with any inhomogeneous or polycrystalline film is considered in a framework similar to the Maxwell Garnett theory by fields adjusted for a slab. While an earlier paper demonstrates this theory for small ionic volume fractions the case of high packing density of the ionic material is investigated here. Analytical solutions for vibrational frequency shifts and intensity changes in IR spectra are obtained in the approximation of a small fraction of nonabsorbing ellipsoids incorporated into the ionic film material.