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1

Doping and Irradiation Dependence of Electrical Conductivity of Fe^{3+} and Ni^{2+} Doped Polyvinyl Alcohol Films

100%

Vijaya Kumar G., Chandramani R.

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issue 6

917-920

EN

PVA and doped PVA films were prepared by solution casting. The Change in electrical conductivity of pure PVA and transition elements FeCl_3 and NiCl_2·6H_2O doped PVA films with and without γ-irradiation in the temperature range 50-130°C has been investigated using four point probe technique. The dc electrical conductivity increases with increase in dopant concentration, with temperature and γ-irradiation. The results revealed that γ-irradiation enhances the electrical conductivity. The variation of electrical conductivity σ with temperature, before and after irradiation is due to the intermolecular hydrogen bonding between Fe^{3+} with OH group of PVA and Ni^{2+} with OH group of PVA. We found that Fe^{3+} doped PVA films show higher conductivity than Ni^{2+} doped PVA films.

2

Molecular Dynamics in Chlorine Compounds Using X-Ray Thermal Parameters and Nuclear Quadrupole Resonance Data

81%

Ramu L., Banu R., Rani S., Chandramani R.

Acta Physica Polonica A

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2006

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vol. 109

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issue 6

775-779

EN

Molecular dynamics (torsional frequencies) in several chlorine compounds were evaluated on the basis of X-ray thermal parameter data and nuclear quadrupole resonance data using Bayer's and Brown's approximation. It was found that the values obtained in both cases are in good agreement. The above approach is a good illustration of the supplementary nature of the data from X-ray studies in relation to nuclear quadrupole resonance studies of compounds in solid state.

3

^{35}Cl NQR Study of Cation Polarizability in Metal Salts of Monochloro Acetic Acid

71%

Ramananda D., Ramu L., Chandramani R., Ramesh K., Uchil J.

Acta Physica Polonica A

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2008

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vol. 113

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issue 6

1679-1685

EN

Various metal salts (Na, K, Rb, and NH_4) of monochloro acetic acid were prepared and the ^{35}Cl nuclear quadrupole resonance frequencies were measured at room temperature. A comparative study of nuclear quadrupole resonance frequencies of monochloro acetic acid and its metal salts is carried out. The frequency shifts obtained in the respective metal chloroacetates are used to estimate the changes in the ionicity of C-Cl bond. Further, the changes in the ionicity of C-Cl bond were used to estimate the percentage of intra-molecular charge transfer between respective cation-anion of the metal salts of chloro acetic acid. The nuclear quadrupole resonance frequency is found to decrease with increasing ionicity of the alkali metal ion.

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1 Uchil J.

1 Vijaya Kumar G.

Doping and Irradiation Dependence of Electrical Conductivity of Fe^{3+} and Ni^{2+} Doped Polyvinyl Alcohol Films

Molecular Dynamics in Chlorine Compounds Using X-Ray Thermal Parameters and Nuclear Quadrupole Resonance Data

^{35}Cl NQR Study of Cation Polarizability in Metal Salts of Monochloro Acetic Acid