Strain dependence of the low‐frequency dielectric constants of a few alkali halides

1983 ◽  
Vol 54 (5) ◽  
pp. 2875-2877 ◽  
Author(s):  
Geetha Balakrishnan ◽  
K. Srinivasan ◽  
R. Srinivasan
Keyword(s):  
Low Frequency ◽  
Alkali Halides ◽  
Dielectric Constants ◽  
Strain Dependence

Refractive indices, electronic polarizabilities and dielectric constants of alkali halides

1992 ◽  
Vol 33 (5) ◽  
pp. 389-393 ◽  
Author(s):  
R.R. Reddy ◽  
S. Anjaneyulu ◽  
T.V.R. Rao
Keyword(s):  
Alkali Halides ◽  
Dielectric Constants ◽  
Refractive Indices

Vibronic side bands of Sm2+ in alkali halides

1969 ◽  
Vol 47 (17) ◽  
pp. 1757-1767 ◽  
Author(s):  
M. Buchanan ◽  
E. J. Woll Jr.
Keyword(s):  
Low Frequency ◽  
Alkali Halides ◽  
Frequency Region ◽  
Defects In Crystals ◽  
Side Band

The calculation of vibronic side bands of defects in crystals is discussed. A model for the deformation of the lattice about a Sm2+ defect in alkali halides and side-band calculations on this model for KBr and KCl containing Sm2+ are compared with experimentally observed side bands. Improvements, particularly in the low frequency region, are found over the calculations assuming no deformation.

scholarly journals Dielectric Constants of a Binary Solution Near the Critical Solution Temperature

1973 ◽  
Vol 51 (4) ◽  
pp. 545-550 ◽  
Author(s):  
I. Lubezky ◽  
R. McIntosh
Keyword(s):  
High Frequency ◽  
Binary Solution ◽  
Critical Concentration ◽  
Low Frequency ◽  
Dielectric Constants ◽  
Solution Temperature ◽  
Dielectric Losses ◽  
Theoretical Studies ◽  
Critical Solution Temperature ◽  
Experimental Knowledge

The dielectric constants and dielectric losses of solutions of nitrobenzene and 2,2,4-trimethyl pentane have been measured near the critical solution temperature over a concentration range of 22–75% by weight and in the frequency regions of 5–60 and 1000 – 4000 kHz. It was found that below a critical concentration of 35% maxima existed in ε′ and ε″ at a temperature of 0.3 °C above the critical solution temperature. At higher concentrations the maxima disappeared and phase separation was preceded only by changes in the thermal coefficients dε′/dT and dε″/dT. The present study combined with others indicates that two regions of loss exist for the system near the critical temperature: low frequency losses of a conductive nature and high frequency losses of the Debye type. The published experimental knowledge of such systems remains insufficient to enable a thorough test of the theoretical studies published recently by Snider.

Electronic polarizability of ions in the alkali-halide crystals

1988 ◽  
Vol 66 (5) ◽  
pp. 385-389 ◽  
Author(s):  
S. K. Sharma ◽  
R. M. Misra ◽  
M. N. Sharma ◽  
M. P. Madan
Keyword(s):  
Theoretical Estimate ◽  
Alkali Halides ◽  
Dielectric Constants ◽  
Electronic Polarizability ◽  
Ionic Radii ◽  
Crystalline Environment ◽  
The Family ◽  
Alkali Halide Crystals ◽  
Experimental Data Analysis ◽  
Good Agreement

A theoretical estimate of the high-frequency dielectric constants is made using the molar polarizabilities for a number of alkali halides. These are shown to be in good agreement with the new and more reliable experimental data. Analysis by means of the additivity rule within the family of salts is used to compute the total free ion polarizability of ionic constituents and the change in polarizability when the ions are placed in a crystalline environment. Furthermore, the anion electronic polarizability in ionic crystals has been determined. It is found to vary from crystal to crystal, as opposed to the generally accepted assumption that each ion has the same polarizability in all compounds. The dependence of polarizability upon ionic radii has been discussed. The results from this simple analysis compare well with other determinations.

Calculations of the Spontaneous Polarizations and Dielectric Constants for AlN, GaN, InN, and SiC

2010 ◽  
Vol 645-648 ◽  
pp. 1203-1206
Author(s):  
Sergey Y. Davydov ◽  
Alexander A. Lebedev
Keyword(s):  
Experimental Data ◽  
Ab Initio ◽  
Spontaneous Polarization ◽  
Reasonable Agreement ◽  
Low Frequency ◽  
Analytical Form ◽  
Dielectric Constants ◽  
Numerical Calculations ◽  
Ab Initio Methods ◽  
Theoretical Results

Within the scope of the Harrison’s bond orbital model the spontaneous polarization, high- and low frequency dielectric constants are obtained in an analytical form. Theoretical results are in a reasonable agreement with the experimental data available and the numerical calculations based on the ab initio methods.

Low frequency electro-optic and dielectric constants of lithium niobate

1966 ◽  
Vol 21 (3) ◽  
pp. 259-260 ◽  
Author(s):  
E. Bernal ◽  
G.D. Chen ◽  
T.C. Lee
Keyword(s):  
Lithium Niobate ◽  
Low Frequency ◽  
Dielectric Constants ◽  
Electro Optic

Epitaxial lift-off of strontium titanate thin films and the temperature dependence of the low frequency dielectric properties of the films

1997 ◽  
Vol 493 ◽  
Author(s):  
M. J. Dalberth ◽  
J. C. Price ◽  
C. T. Rogers
Keyword(s):  
Strontium Titanate ◽  
Low Frequency ◽  
Dielectric Constants ◽  
Thermally Activated ◽  
Lanthanum Aluminate ◽  
Barium Copper ◽  
Dielectric Constant And Loss ◽  
Acid Etch ◽  
Yttrium Barium ◽  
Lift Off

ABSTRACTUsing pulsed laser ablation, we have grown epitaxial bilayers of strontium titanate (STO) and yttrium barium copper oxide (YBCO) on lanthanum aluminate (LAO) and neodymium gallate (NGO) substrates. Using a selective acid etch, we have removed the YBCO from the middle of the bilayer and lifted off the strontium titanate films from their parent substrates. Using coplanar interdigital capacitors patterned on the films' surface, we have measured the dielectric constant and loss as a function of frequency and temperature and have resolved frequency dependent loss peaks which indicate thermally activated behavior. Also, by applying a dc bias to the capacitor, we have seen tuning of the lifted off films' dielectric constants that compares favorably to films attached to substrates.

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