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M. Theivanayagom

Bio: M. Theivanayagom is an academic researcher from Hindu College, University of Delhi. The author has contributed to research in topics: Lattice constant & Debye model. The author has an hindex of 1, co-authored 1 publications receiving 15 citations.

Papers
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TL;DR: In this paper, single crystals were grown by the slow evaporation method from aqueous solutions and density was measured by the floatation method using X-ray diffraction data collected for powder samples and used for the estimation of lattice variation and thermal parameters.
Abstract: Ni x Mg1−x SO4·7H2O single crystals were grown by the slow evaporation method from aqueous solutions. Density was measured by the floatation method. X-ray diffraction data were collected for powder samples and used for the estimation of lattice variation and thermal parameters like Debye-Waller factor, mean-square amplitude of vibration and Debye temperature. Lattice volumes approximately obey a relation similar to Retger’s rule. Values of thermal parameters do not follow any particular order with composition. The results obtained are reported.

15 citations


Cited by
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TL;DR: In this paper, the authors have grown (KCl) x (KBr) y − x (KI) 1− y crystals for various values of x and y by the melt method and physically characterized.
Abstract: The mixed and impurity-added (doped) crystals of alkali halides are found to be harder than the end members and so they are more useful. In view of this, it becomes necessary and useful to prepare binary- and ternary-mixed crystals regardless of miscibility problem and characterize them by measuring their physical properties. In the present work, we have grown (KCl) x (KBr) y − x (KI) 1− y crystals for various values of x and y by the melt method and physically characterized. Bulk composition of the crystals was measured using the measured density and refractive index values. X-ray diffraction analysis indicates the existence of two phases in the mixed crystals. Thermal parameters were determined using the X-ray powder diffraction intensity data.

33 citations

Journal ArticleDOI
TL;DR: In this article, a multiphased mixed crystal of NaCl, KCl and KI was grown by the melt method, for the first time, and lattice parameters and thermal parameters (Debye-Waller factor, mean square amplitude of vibration, Debye temperature and Debye frequency) were determined from the X-ray powder diffraction data.
Abstract: Multiphased mixed crystals of NaCl, KCl and KI were grown by the melt method, for the first time. Densities and refractive indices of all the grown crystals were determined and used for the estimation of the composition in the crystal. Atomic absorption spectroscopic measurements were done to estimate the metal atom contents in the crystal. Lattice parameters and thermal parameters (Debye-Waller factor, mean square amplitude of vibration, Debye temperature and Debye frequency) were determined from the X-ray powder diffraction data. DC and AC electrical measurements were done at various temperatures ranging from 40 to 150°C. Activation energies were also estimated. The observed lattice parameters showed that the system exhibits three phases each nearly corresponds to NaCl, KCl and KI. The thermal and electrical parameters show a highly nonlinear bulk composition dependence. Results are reported. (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

28 citations

Journal ArticleDOI
TL;DR: In this paper, the Debye-Waller factor, mean square amplitude of vibration, Debye temperature and Debye frequency were determined from the X-ray powder diffraction data.

26 citations

Journal ArticleDOI
TL;DR: In this article, solid solutions of NaCl, KBr and KI were prepared by the melt method for the first time, and lattice parameters and thermal parameters like Debye-Waller factor, mean square amplitude of vibration, Debye temperature and Debye frequency were determined from the X-ray powder diffraction data.
Abstract: Solid solutions of NaCl, KBr and KI were prepared by the melt method for the first time. Densities and refractive indices of all the prepared solid solutions were determined and also used for the estimation of the bulk composition in the crystal. Lattice parameters and thermal parameters like Debye–Waller factor, mean square amplitude of vibration, Debye temperature and Debye frequency were determined from the X-ray powder diffraction data. The observed lattice parameters showed the existence of three phases in solid solutions each nearly corresponds to NaCl, KBr and KI. The thermal parameters show a highly non-linear bulk composition dependence.

22 citations