scholarly journals Far-infrared Reflection Spectra, Optical and Dielectric Constants, and Lattice Vibrations of Some Fluoride Crystals

1971 ◽  
Vol 44 (11) ◽  
pp. 3014-3020 ◽  
Author(s):  
Ichiro Nakagawa
Keyword(s):  
Far Infrared ◽  
Dielectric Constants ◽  
Reflection Spectra ◽  
Lattice Vibrations ◽  
Infrared Reflection ◽  
Fluoride Crystals

Lattice Vibration Spectra XXIV*. Far-Infrared Reflection Spectra, Optical and Dielectric Constants, and Effective Charges of the Pyrite Type Compounds FeS2, MnS2, MnSe2, and MnTe2

1981 ◽  
Vol 36 (2) ◽  
pp. 184-190 ◽  
Author(s):  
H. D. Lutz ◽  
G. Kliche ◽  
H. Haeuseler
Keyword(s):  
Lattice Vibration ◽  
Far Infrared ◽  
Dielectric Constants ◽  
Reflection Spectra ◽  
Classical Oscillator ◽  
Infrared Reflection ◽  
Effective Charges ◽  
First Time ◽  
Born Effective Charge

AbstractFrom the far-infrared reflection spectra of the pyrite type compounds FeS2, MnS2, MnSe2, and MnTe2 we determined the TO and LO phonon frequencies at wave vector | q | ≈ 0 by both Kramers-Kronig analysis and classical oscillator fit method. In the case of MnSe2 and MnTe2 we found for the first time all five group-theoretically allowed reststrahlen bands. The phonon frequencies obtained from both single crystal and pressed pellet reflection measurements do not show any significant differences. The calculated optical and dielectric constants however are strongly affected by the surface quality of the sample. Effective ionic charges (Born effective charge, Szigeti charge) were calculated from the experimentally determined TO/LO splittings. They demonstrate an increasing ionicity in the order FeS2<MnTe2<MnSe2<MnS2.

scholarly journals Far Infrared Reflection Spectra and Lattice Vibrations of CsNiCl3Crystal

1978 ◽  
Vol 51 (1) ◽  
pp. 103-107 ◽  
Author(s):  
Kenji Akiyama ◽  
Yoshiyuki Morioka ◽  
Ichiro Nakagawa
Keyword(s):  
Far Infrared ◽  
Reflection Spectra ◽  
Lattice Vibrations ◽  
Infrared Reflection

Determining the Free Carrier Density in Cd x Hg1–xTe Solid Solutions from Far-Infrared Reflection Spectra

2017 ◽  
Vol 51 (13) ◽  
pp. 1732-1736
Author(s):  
A. G. Belov ◽  
I. A. Denisov ◽  
V. E. Kanevskii ◽  
N. V. Pashkova ◽  
A. P. Lysenko
Keyword(s):  
Solid Solutions ◽  
Carrier Density ◽  
Far Infrared ◽  
Free Carrier ◽  
Reflection Spectra ◽  
Free Carrier Density ◽  
Infrared Reflection
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