Book reviewPhysics of non-crystalline solids: edited by J. A. Prins. 667 pages, diagrams, illus. 6 × 9 in. New York, John Wiley & Sons, Interscience, 1965. Price, $27.50

EPR and FT-IR spectroscopic studies of B2O3Bi2O3MnO glasses

The effect of silicate network modifiers on colour and electron spectra of transition metal ions

Thermal, structural and magnetic properties of some zinc phosphate glasses doped with manganese ions

Mixed alkali effect in borate glasses—EPR and optical absorption studies in xNa2O–(30−x)K2O–70B2O3 glasses doped with Mn2+

By using X-ray diffraction analysis, EPR and magnetic measurements, the chromium-ion distribution in xCr2O3-(1−x) [3B2O3-PbO] glasses with 0⩽x⩽35 mol% Cr2O3 was studied. EPR investigation evidenced the presence of both Cr3+ and Cr5+ ions, the latter being in small proportion, in agreement with the atomic magnetic moment values. For concentrations x⩽20 mol% Cr2O3 the isolated Cr3+ ions coexist with those coupled by super-exchange magnetic interactions, the isolated ones prevailing only for x 20 mol % Cr2O3 microcrystalline precipitates were detected, giving rise to an antiferromagnetic transition with Neel temperature, NN≃310 K and paramagnetic Curie temperature, θp=−480 K.

M. Peteanu

Papers

EPR and magnetic susceptibility studies of xCr2O3-(1-x) 3B2O3-PbO glasses

The valence states of manganese ion in potassium-borate oxide glasses

Magnetic properties of x • MnO • (1−x)[19TeO2 • PbO] glasses

EPR studies of Mn2+ ion distribution in xMnO·(100-x) [19TeO2·PbO] glasses