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M.S.R. Rao

Bio: M.S.R. Rao is an academic researcher from Indian Institute of Technology Kharagpur. The author has contributed to research in topics: Dielectric & Dielectric loss. The author has an hindex of 1, co-authored 1 publications receiving 5 citations.

Papers
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Journal ArticleDOI
TL;DR: In this article, the variations in the dielectric constant (K′ ) and dielectrics loss (tan δ) with frequency and temperature were studied and various results obtained are presented.
Abstract: Alkaline earth sulphide (AES) phosphors have been of considerable importance in research in recent years because of their potential for many device applications. AES phosphors doped with varying concentrations of rare earth (RE) impurities were prepared by the carbon reduction method and dielectric studies were carried out on them. The variations in the dielectric constant ( K′ ) and dielectric loss (tan δ) with frequency and temperature were studied and various results obtained are presented. An attempt has been made to propose a plausible model to explain the different results obtained in this study.

5 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, a comparative analysis of optical, luminescence and dielectric properties of Tb doped lanthanum and gadolinium molybdate phosphors is presented.

32 citations

Journal ArticleDOI
TL;DR: In this paper, the variations of the dielectric constant, the loss tan and the conductivity with the temperature and frequency are analyzed, and the functional relationship between the different values of these values is determined by fitting the observed data with the respective polymeric expressions of the type ϵ ′ = a 0 + a 1 T 2 - lnσ = a + b (T - T 0 ) 2.
Abstract: Results of dielectric measurements conducted on lanthanum heptamolybdate grown by a gel technique employing the system La(NO 3 ) 3 MoO 3 NH 4 OHHNO 3 Na 2 SiO 3 are presented. The variations of the dielectric constant e′, dielectric loss tan δ and conductivity σ with the temperature and frequency are critically analyzed. The dielectric constant increases with temperature at lower frequencies (10 3 Hz), reaching a maximum value of 320 at 125 °C, after which it abruptly decreases. The dielectric loss tan δ and conductivity σ show both a temperature as well as a frequency dependence. The sharp increase in e′ with temperature is attributed to total polarization resulting from a space charge effect. The functional relationship between the dielectric constant, conductivity and temperature is determined by fitting the observed data with the respective polymeric expressions of the type ϵ ′ = a 0 + a 1 T 2 - lnσ = a + b ( T - T 0 ) 2 The non-linearities and anomalous behaviour of the dielectric constant near the transition temperature, supported by hysteresis studies, indicate the possibility of these materials ferroelectric.

24 citations

Journal ArticleDOI
TL;DR: In this paper, the variation of the dielectric constant (e ) and the electrical conductivity ( σ ) at different temperatures and frequencies of the applied electric field was studied on mixed Gd-Ba molybdate crystals.

21 citations

Journal ArticleDOI
TL;DR: In this paper, the dielectric properties of non-linear organic crystals of acetoacetanilide are studied before and after irradiation, where the defects produced due to irradiation are found to cause an increase in dielectrics.
Abstract: Dielectric properties of non-linear organic crystals of acetoacetanilide are studied before and after irradiation. Crystals are irradiated by 120 MeV Ag13+ ions. The variation of dielectric constant, dielectric loss, ac conductivity and the loss factor of both unirradiated and irradiated samples are measured, at different fluences. The defects produced due to irradiation, cause an increase in dielectric constant. At higher fluence, i.e. 10 12 ions / cm 2 , the defects are found to anneal out.

12 citations