Structural Phase Transition of Orthorhombic LaCrO3 Studied by Neutron Powder Diffraction
An orthorhombic to a rhombohedral structural phase transition of LaCrO3 has been studied by the neutron powder diffraction over the temperature range of 295–1013 K. At the phase transition around 260°C, the negative volume expansion was observed, and the amount of the volume compression was estimate...
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| Veröffentlicht in: | Journal of solid state chemistry 2000-11, Vol.154 (2), p.524-529 |
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| container_title | Journal of solid state chemistry |
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| creator | Oikawa, K. Kamiyama, T. Hashimoto, T. Shimojyo, Y. Morii, Y. |
| description | An orthorhombic to a rhombohedral structural phase transition of LaCrO3 has been studied by the neutron powder diffraction over the temperature range of 295–1013 K. At the phase transition around 260°C, the negative volume expansion was observed, and the amount of the volume compression was estimated to be −0.081375 Å3 (−0.138%) per formula unit. The coefficients of volume thermal expansion, −(1/V)/∂V/∂T), were estimated to be 2.285(16)×10−5 K−1 and 2.842(12)×10−5 K−1 for the orthorhombic and rhombohedral phases, respectively. The Rietveld refinement revealed that the volume compression at the phase transition was principally due to the shrinking of the [CrO6] octahedra. |
| doi_str_mv | 10.1006/jssc.2000.8873 |
| format | Article |
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At the phase transition around 260°C, the negative volume expansion was observed, and the amount of the volume compression was estimated to be −0.081375 Å3 (−0.138%) per formula unit. The coefficients of volume thermal expansion, −(1/V)/∂V/∂T), were estimated to be 2.285(16)×10−5 K−1 and 2.842(12)×10−5 K−1 for the orthorhombic and rhombohedral phases, respectively. 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At the phase transition around 260°C, the negative volume expansion was observed, and the amount of the volume compression was estimated to be −0.081375 Å3 (−0.138%) per formula unit. The coefficients of volume thermal expansion, −(1/V)/∂V/∂T), were estimated to be 2.285(16)×10−5 K−1 and 2.842(12)×10−5 K−1 for the orthorhombic and rhombohedral phases, respectively. 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At the phase transition around 260°C, the negative volume expansion was observed, and the amount of the volume compression was estimated to be −0.081375 Å3 (−0.138%) per formula unit. The coefficients of volume thermal expansion, −(1/V)/∂V/∂T), were estimated to be 2.285(16)×10−5 K−1 and 2.842(12)×10−5 K−1 for the orthorhombic and rhombohedral phases, respectively. The Rietveld refinement revealed that the volume compression at the phase transition was principally due to the shrinking of the [CrO6] octahedra.</abstract><cop>San Diego, CA</cop><pub>Elsevier Inc</pub><doi>10.1006/jssc.2000.8873</doi><tpages>6</tpages></addata></record> |
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| subjects | Condensed matter: structure, mechanical and thermal properties Crystalline state (including molecular motions in solids) Crystallographic aspects of phase transformations pressure effects Exact sciences and technology lanthanum chromite neutron powder diffraction Physics Rietveld refinement structural phase transition Structure of solids and liquids crystallography Thermal expansion thermomechanical effects Thermal expansion thermomechanical effects and density Thermal properties of condensed matter Thermal properties of crystalline solids |
| title | Structural Phase Transition of Orthorhombic LaCrO3 Studied by Neutron Powder Diffraction |
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