Journal ArticleDOI
Far-IR reflectance study on (Ba(1-x)Srx)(Zn1/3Ta2/3)O3 dielectric resonators as a function of tolerance factor
TLDR
In this article, the effect of the tilting of octahedra on polar phonon modes of lattice vibration was investigated, which contributes a major part to the dielectric polarization in the crystal.Abstract:
The aim of this work is to understand the effect of the tilting of octahedra on polar phonon modes of lattice vibration, which contributes a major part to the dielectric polarization in the crystal. The tolerance factor, which is a measure of the packing of ions in the perovskite unit cell, determines the tilting of oxygen octahedra in the perovskite materials. In this work we have discussed the variation of polar phonon frequencies with respect to the tolerance factor in the composition (Ba(1−x)Srx)(Zn1/3Ta2/3)O3 with x=0.0,0.3,0.5,0.7,1.0. The dielectric properties measured at the microwave frequency range are also highlighted to support the ideas proposed in this paper.read more
Citations
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Journal ArticleDOI
Infrared dielectric response of relaxor ferroelectrics
TL;DR: In this paper, the dielectric response of relaxor-type complex perovskites in the phonon-frequency region is discussed. And the effect of the cation occupational disorder and of the nanoscopic inhomogeneous polarisation on the infrared response is considered in the framework of the factor-group symmetry analysis and the effective medium approach.
Journal ArticleDOI
Correlation of crystal structure, dielectric properties and lattice vibration spectra of (Ba1−xSrx)(Zn1/3Nb2/3)O3 solid solutions
Feng Shi,Helei Dong +1 more
TL;DR: The results show that with the increase in Sr(2+) content, the lattice structures of ceramics turn gradually from disordered cubic structure to ordered structure because antiphase tilting of the oxygen octahedra occurs where x≥ 0.65, which is the main reason for the phase transitions and variation of crystal structure.
Journal ArticleDOI
Far-infrared spectroscopy in ordered and disordered BaMg1/3Nb2/3O3 microwave ceramics
Anderson Dias,Roberto L. Moreira +1 more
TL;DR: In this paper, a far-infrared spectroscopy of Ba(Mg1/3Nb2/3)O3 ceramics with suitable microwave dielectric properties for application in wireless communications and information access technologies was studied.
Journal ArticleDOI
Raman Spectroscopy of (Ba1-xSrx)(Mg1/3Nb2/3)O3 Solid Solutions from Microwave-Hydrothermal Powders
TL;DR: In this paper, the crystal structure and phonon modes of chemically substituted (Ba1-xSrx)(Mg1/3Nb2/3)O3 powders were evaluated using X-ray diffraction and Raman spectroscopy.
Journal ArticleDOI
Vibration Spectra and Structural Characteristics of Ba[(Zn1-x Mg x )1/3Nb2/3]O3 Solid Solutions
He Lei Dong,Feng Shi +1 more
TL;DR: In this article, the correlation between crystal structures and vibration modes of these solid solutions as a function of Zn2+ ions replaced by Mg2+ ion was found, and a correlation of phonon vibrations with the microstructure was found.
References
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Journal ArticleDOI
A Dielectric Resonator Method of Measuring Inductive Capacities in the Millimeter Range
B.W. Hakki,P.D. Coleman +1 more
TL;DR: In this article, a novel technique for the measurement of dielectric and magnetic properties of a homogeneous isotropic medium in the range of approximately 3 to 100 kmc is described.
Journal ArticleDOI
Simple ways of determining perovskite structures
TL;DR: In this article, a simple technique is described for ascertaining trial models for the structures of perovskites, which relies on an understanding of the fundamental components of the structure and rules are given for determining trial models rapidly.
Journal ArticleDOI
Analysis and Evaluation of a Method of Measuring the Complex Permittivity and Permeability Microwave Insulators
TL;DR: In this article, a resonant post technique for characterizing dielectric and magnetic materials at microwave frequencies was proposed and experimental results of the temperature dependence of the relative dielectrics constant of nonmagnetic materials with /spl epsilon/sub r/, varying from 4 to 60, and also loss tangent measurements at room temperature.
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Dielectric and Structural Characteristics of Ba- and Sr-based Complex Perovskites as a Function of Tolerance Factor
TL;DR: In this paper, a relationship between dielectric permittivity and the tolerance factor (t) is proposed, and transmission electron microscopy is used to demonstrate examples of the structural modifications which cause the anomalies in τe at given values of t.