NDLI: Infrared-active phonons of perovskite HoMn/sub 1-x/Co/sub x/O/sub 3/ (x=0--0.8)

Content Provider	IEEE Xplore Digital Library
Author	Gao, F. Wang, X.L. Farhoudi, M.M. Lewis, R.A.
Copyright Year	1965
Abstract	Polycrystalline perovskites compounds HoMn/sub 1-x/Co/sub x/O/sub 3/ (x=0--0.8) have been prepared by conventional solid-state reaction. Here, we used far-infrared (FIR) spectroscopy to study infrared active phonon modes and present a comparative analysis of infrared transmission spectra of polycrystalline HoMn/sub 1-x/Co/sub x/O/sub 3/ (x=0--0.8). The data indicated that phonon modes significantly changed with increase of cobalt doping level. Four main bands were assigned as external, torsional, bending and stretching bands. The external vibration energy remain same at /spl omega//sub 1//spl sim/190 cm/sup -1/ for Co doping x/spl les/0.5 and shift to higher energy for x>0.5. Torsional and bending bands exhibit splitting. The stretching band is at 600 cm/sup -1/ for all samples, but the bandwidth is reduced as Co doping increased. The transmission spectrum of HoMn/sub 4/5/Co/sub 1/5/O/sub 3/ was analyzed to obtain the spectrum of optical density. The minimum number of oscillators to obtain a reliable fit is 5 by using a sum of noninteracting harmonic oscillators.
Sponsorship	IEEE Magnetics Society
Starting Page	2763
Ending Page	2765
Page Count	3
File Size	137321
File Format	PDF
ISSN	00189464
Volume Number	41
Issue Number	10
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Phonons Manganese Magnetic properties Spectroscopy Infrared spectra Doping Glass Superconducting materials Solid state circuits Finite impulse response filter phonon modes Far-infrared spectroscopy perovskites
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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