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Anisotropy of the Diamagnetic Susceptibility in 3,5-dibromo-p-amino and 3,5-dibromo-p-hydroxybenzoic Acids

100%

Abdel-Kader M.

Acta Physica Polonica A

1992

vol. 82

issue 3

407-411

The mean molar susceptibility (χ_{M}) for the two compounds 3,5-dibromo-p-aminobenzoic acid, Br_{2}C_{6}H_{2}(p-NH_{2})COOH, and 3,5-dibromo-p-hydroxybenzoic acid, Br_{2}C_{6}H_{2}(p-OH)COOH, has been determined. The principal molecular susceptibilities K^{∥} and K^{⊥} have been evaluated. The magnetic anisotropy of each of the two compounds was obtained. From the atonic coordinates, as given by the X-ray structure analysis of Br_{2}C_{6}H_{2}(p-NH_{2})COOH, the crystal susceptibilities (χ_{a}, χ_{b}, and χ_{c}) have been calculated. The magnetic properties are interpreted in the light of the crystal structure.

Electrical and Thermal Conductivities of Some Sulphate Compounds

45%

Abdel-Kader M., Mosaad M., Olofa S., Abdel-Ati M., El-Shawarby A.

Acta Physica Polonica A

1993

vol. 83

issue 2

187-194

The electrical conductivity σ and the thermal conductivity λ were investigated at varying temperature (40 < T < 120°C) for two sulphate compounds, anhydrous mercury(II) sulphate HgSO_{4} and cerous(III) sulphate Ce_{2}(SO_{4})_{3}·H_{2}O. It seems likely that each of the two sulphate salts undergoes structural phase transition around 90°C. The differential thermal analysis thermogram was carried out as an aid for confirming of the observed phase transitions. The mechanism of the heat transfer is mainly due to phonons. Interpretation of the obtained data was given on the basis of the reorientational motion of the SO_{4}‾ ‾ ions.

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2 Acta Physica Polonica A

1 1993

1 1992

2 Abdel-Kader M.

1 Abdel-Ati M.

1 El-Shawarby A.

1 Mosaad M.

1 Olofa S.

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Anisotropy of the Diamagnetic Susceptibility in 3,5-dibromo-p-amino and 3,5-dibromo-p-hydroxybenzoic Acids

Electrical and Thermal Conductivities of Some Sulphate Compounds