Long-Wavelength Optical Lattice Vibrations in Mixed KMgF3-KNiF3Crystals

1968 ◽  
Vol 175 (3) ◽  
pp. 1180-1190 ◽  
Author(s):  
A. S. Barker ◽  
J. A. Ditzenberger ◽  
H. J. Guggenheim
Keyword(s):  
Optical Lattice ◽  
Lattice Vibrations ◽  
Long Wavelength

Long-Wavelength Optical Lattice Vibrations inBaySr1−yF2andSryCa1−yF2

1967 ◽  
Vol 164 (3) ◽  
pp. 1169-1184 ◽  
Author(s):  
H. W. Verleur ◽  
A. S. Barker
Keyword(s):  
Optical Lattice ◽  
Lattice Vibrations ◽  
Long Wavelength

Effect of in Concentration on the Optical Lattice Vibrations in Quaternary AlxInyGa1-x-yN Alloys

2012 ◽  
Vol 501 ◽  
pp. 281-285
Author(s):  
A.I. Aljameel ◽  
H. Abu Hassan ◽  
S.S Ng
Keyword(s):  
Mole Fraction ◽  
Optical Lattice ◽  
Room Temperature ◽  
Molecular Beam ◽  
Buffer Layers ◽  
Lattice Vibrations ◽  
High Quality ◽  
Long Wavelength ◽  
Sapphire Substrates ◽  
Mode Behavior

Fourier transform infrared (FTIR) spectroscopy has been utilized to measure long-wavelength optical lattice vibrations of high-quality quaternary AlxlnyGa1-x-yN thin films at room temperature. The AlxlnyGa1-x-yN films were grown on c-plane (0001) sapphire substrates with AlN as buffer layers using plasma assisted molecular beam epitaxy (PA-MBE) technique with indium (In) mole fraction y = 0.0 to 0.10 and constant aluminium (Al) mole fraction x = 0.06. The experimental results indicated that the AlxlnyGa1-x-yN alloys had two-mode behavior, for the A1 (LO) and E1 (TO) modes.

Long-wavelength lattice vibrations of Ag3In5Se9 and Ag3In5Te9 single crystals — An inversion of LO- and TO-mode frequencies

2016 ◽  
Vol 30 (18) ◽  
pp. 1650229 ◽  
Author(s):  
Nizami Mamed Gasanly
Keyword(s):  
Refractive Index ◽  
Single Crystals ◽  
Longitudinal Optical ◽  
Absorption Index ◽  
Energy Losses ◽  
Optical Parameters ◽  
Lattice Vibrations ◽  
Frequency Range ◽  
Long Wavelength ◽  
Optical Modes

Infrared (IR) reflectivities are registered in the frequency range of 50–2000 cm[Formula: see text] for Ag3In5Se9 and Ag3In5Te9 single crystals grown by Bridgman method. Three infrared-active modes are detected in spectra. The optical parameters, real and imaginary parts of the dielectric function, the function of energy losses, refractive index, absorption index and absorption coefficient were calculated from reflectivity experiments. The frequencies of transverse and longitudinal optical modes (TO and LO modes) and oscillator strength were also determined. The bands detected in infrared spectra were tentatively attributed to various vibration types (valence and valence-deformation). The inversion of LO- and TO-mode frequencies of the sandwiched pair was observed for studied crystals.

Detection of Optical Lattice Vibrations in Ge and ZrH by Scattering of Cold Neutrons

1957 ◽  
Vol 108 (4) ◽  
pp. 1091-1092 ◽  
Author(s):  
I. Pelah ◽  
C. M. Eisenhauer ◽  
D. J. Hughes ◽  
H. Palevsky
Keyword(s):  
Optical Lattice ◽  
Lattice Vibrations ◽  
Cold Neutrons
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