The structure of boron-oxygen groups in InBO 3 single crystals (calcite type) is investigated by Raman spectroscopy. The fundamental vibrational modes of indium orthoborate are analyzed using detailed studies of polarized Raman spectra. The polarization and relative intensities of lines in the spectra of InBO 3 are shown to differ markedly from those in the spectra of other calcite-structure crystals (LuBO 3 and CaCO 3 ) and alkali and alkaline-earth orthoborates and their melts. This effect is tentatively attributed to the large covalent contribution to the energy of bonding between In 3+ and the oxygens of the [BO 3 ] groups.

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The title compounds (M: La, Pr, Nd‐Er, Y) are prepared either by solid phase reaction of M2O3, GeO2 and H3BO3 or coprecipitation from solution.

Nd(BO2)3 kristallisiert monoklin in I2/a (I2/ c) mit a = 6,40, b = 8,08, c = 8,06 Å, β = 94°, Z=4.