Fe₃BO₆ shows no thermal hysteresis around the phase transition temperatureT_SR=418 K; Fe_2·88Ga_0·12BO₆ undergoes spin transition atT_SR=403 K resulting in a reduction of theT_SR. Both these features are different from the reported observations on α-Fe₂O₃. The two Fe³⁺ sites show difference in their magnetic interactions. Ga³⁺ replaces Fe³⁺ in a random manner.

Mössbauer measurements have been performed on a number of metallic glasses. The temperature dependence of average hyperfine or internal magnetic fieldH_eff(T) arises from long wavelength spin wave excitations in these glasses. Values ofB_3/2 andC_5/2 are in general much higher than those observed for crystalline ferromagnets indicating higher density of states for spin waves in amorphous ferromagnets.

The emission spectra of Pr³⁺, Eu³⁺ and Dy³⁺ doped in NASICON type phosphate glass, Na₃TiZnP₃O₁₂ (NTZP) are studied. The dopant rare earth ions occupy sites with 8–9 coordination in a highly covalent environment. For Pr³⁺ ion, calculated and observed branching ratios for lasing transitions³P₀→³H_4,6 agree well and found to be 0·64 and 0·24, respectively. The emissions of Pr³⁺ show strong temperature dependence on account of Boltzmann population of the higher excited states at room temperature. The excitation spectrum of Eu³⁺ gives rise to phonon assisted side band for⁵D₂←⁷F₀ transition at higher energy side with a phonon energy maximum of 1022 cm⁻¹ and an electron phonon coupling strength (g) of 0·018. The value of phonon energy maximum agrees with infrared spectral data. The results show that observation of high energy emissions in phosphate glasses require much higherg values. The red/orange and yellow/blue transitions of Eu³⁺ and Dy³⁺, respectively show that the Eu³⁺ occupy more distorted site than Dy³⁺.