Abstract

AbstractTbB3O6, that suffers peritectic decomposition below its melting point, was obtained as single crystals by growth from borate flux. Depending on the borate flux, orthorhombic (space group Pnma) TbB3O6 belonging to the isomorphic series of rare earth triborates with small lanthanides, or monoclinic (space group C 2/c) TbB3O6, belonging the corresponding isomorphic series with large lanthanides, was synthesized. Within a broad range at subambient temperatures monoclinic TbB3O6 shows a structural phase transition with a large thermal hysteresis. The phase transition was characterised by means of differential scanning calorimetry, temperature‐dependent polarization microscopy and single‐crystal X‐ray diffraction. According to the observed features the transition can be classified as a non‐ferroic, martensitic phase transformation. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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