Showing papers by "V. R. K. Murthy published in 1995"
TL;DR: In this article, cavity perturbation technique is employed for the characterisation of semiconductors at microwave frequency for its conductivity, and temperature variation of microwave conductivity studies provide the information regarding the band gap, scattering parameter and impurity ionization energy.
Abstract: The cavity perturbation technique is employed for the characterisation of semiconductors at microwave frequency for its conductivity. Temperature variation of microwave conductivity studies provide the information regarding the band gap, scattering parameter and impurity ionization energy. Change in the real part of the dielectric permittivity with conductivity indicates the change in the momentum relaxation time.
7 citations
TL;DR: In this paper, the microwave characteristics of (Ca 0.6,Sr 0.4)ZrO3 with substitution of Ti in the place of Zr were studied in terms of change of octahedral tilting with composition and temperature.
Abstract: The microwave characteristics of (Ca0.6 ,Sr 0.4)ZrO3 were studied with substitution of Ti in the place of Zr. The substitution of Ti for Zr affects the microwave dielectric properties of (Ca0.6,Sr0.4)ZiO3, in that both the dielectric constant (ϵ r ) and temperature coefficient of resonant frequency (τ f ) increase and Q factor decreases. The results are discussed in terms of change of octahedral tilting with composition and temperature.
3 citations
TL;DR: In this paper, a noncontact method of measuring the conductivity of pure and mixed stages of graphite-ferric chloride intercalation compounds has been outlined, which is insensitive to the degree of anisotropy and is well suited to the measurement of in-plane conductivities in quasi-two-dimensional systems.
Abstract: A non-contact method of measuring the conductivity of pure and mixed stages of graphite-ferric chloride intercalation compounds has been outlined. This r.f. technique is insensitive to the degree of anisotropy and is found to be well suited to the measurement of in-plane conductivities in quasi-two-dimensional systems. An approximate method of estimating the percentage composition of stages in mixed stages by measuring the conductivity is described.
3 citations
TL;DR: In this paper, room temperature measurements of the 0.5-2.0 eV optical reflectance of carefully prepared pure stages 3,4,6 and the mixed stages (2,3, and (3,4) graphite-ferric chloride intercalation compound have been performed.
Abstract: Room temperature measurements of the 0.5-2.0 eV optical reflectance of carefully prepared pure stages 3,4,6 and the mixed stages (2,3) and (3,4) graphite-ferric chloride intercalation compound have been performed. The stages show metallic nature with a large contribution from the imaginary part of the dielectric constant. The higher value of the dielectric constant shows the charge transfer from graphite to ferric chloride to be ionic in nature.
1 citations
15 Feb 1995
TL;DR: In this paper, a force field technique and /spl delta/function potential model was used to determine the molecular polarizability of cytosine and its substituents, and the agreement was satisfactory.
Abstract: Bond and molecular polarizabilities of cytosine and a few of its substituents are determined by force field technique and /spl delta/-function potential model. Interestingly, the longitudinal bond polarizability coefficients of C/sub 4/-C/sub 5/, C/sub 5/-CH/sub 3/ bring out the aromatic nature of the C/sub 5/ X-ray and NMR observations, quantum chemical calculations and UV photoelectron studies are discussed in relation to this. The agreement is satisfactory.