1. Polymorphy of monoclinic terbium triborate, TbB3O6.
- Author
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R. Fröhlich
- Subjects
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TERBIUM , *MELTING points , *BORATE minerals , *RARE earth metals , *TEMPERATURE effect , *X-ray diffraction - Abstract
TbB3O6, 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 TbB3O6belonging to the isomorphic series of rare earth triborates with small lanthanides, or monoclinic space group C2c TbB3O6, belonging the corresponding isomorphic series with large lanthanides, was synthesized. Within a broad range at subambient temperatures monoclinic TbB3O6shows a structural phase transition with a large thermal hysteresis. The phase transition was characterised by means of differential scanning calorimetry, temperaturedependent polarization microscopy and singlecrystal Xray diffraction. According to the observed features the transition can be classified as a nonferroic, martensitic phase transformation. © 2008 WILEYVCH Verlag GmbH & Co. KGaA, Weinheim [ABSTRACT FROM AUTHOR]
- Published
- 2008