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Persistent URL http://purl.org/net/epubs/work/29453
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Record Id 29453
Title Temperature-induced phase transitions in BaTbO3
Abstract The crystal structures of BaTbO3 have been investigated over a wide temperature range between 40 and 773 K using high-resolution time-of-flight neutron powder diffraction. Two-phase transitions were observed. Below about 280 K, BaTbO3 adopts an orthorhombic perovskite structure (space group Ibmm), which is characterized by rotation of TbO6 octahedra about the pseudocubic two-fold axis. Above 280 K, BaTbO3 undergoes a first-order phase transition to a tetragonal symmetry (space group I4/mcm), in which the tilting of the octahedra is around the pseudocubic four-fold axis. As the temperature is further increased, BaTbO3 adopts the primitive cubic aristotype at about 623 K. This later phase transformation is characterized by a gradual decrease of the rotation angle, indicating a continuous phase transition, which is described by a critical exponent =0.35.
Organisation CCLRC , ISIS , ISIS-HRPD
Keywords Chemistry , ISIS 2004
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Language English (EN)
Type Details URI(s) Local file(s) Year
Journal Article J Solid State Chem 177 (2004): 1667-1671. doi:10.1016/j.jssc.2003.12.022 2004