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First-order character of the displacive structural transition in BaWO4 |
Tan Da-Yong (谭大勇), Xiao Wan-Sheng (肖万生), Zhou Wei (周微), Chen Ming (陈鸣), Xiong Xiao-Lin (熊小林), Song Mao-Shuang (宋茂双 ) |
Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China |
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Abstract Nearly all displacive transitions have been considered to be continuous or second order, and the rigid unit mode (RUM) provides a natural candidate for the soft mode. However, in-situ X-ray diffraction and Raman measurements show clearly the first-order evidences for the scheelite-to-fergusonite displacive transition in BaWO4: a 1.6% volume collapse, coexistence of phases and hysteresis on release of pressure. Such first-order signatures are found to be the same as the soft modes in BaWO4, which indicates the scheelite-to-fergusonite displacive phase transition hides a deeper physical mechanism. By the refinement of atomic displacement parameters, we further show that the first-order character of this phase transition stems from a coupling of large compression of soft BaO8 polyhedrons to the small displacive distortion of rigid WO4 tetrahedrons. Such a coupling will lead to a deeper physical insight in the phase transition of the common scheelite-structured compounds.
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Received: 19 December 2011
Revised: 26 February 2012
Accepted manuscript online:
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PACS:
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62.50.-p
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(High-pressure effects in solids and liquids)
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63.70.+h
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(Statistical mechanics of lattice vibrations and displacive phase transitions)
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61.05.cp
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(X-ray diffraction)
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78.30.-j
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(Infrared and Raman spectra)
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Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11179030 and 90714011) and the Knowledge Innovation Project of the Chinese Academy of Sciences (Grant No. KJCX2-SW-N20). |
Corresponding Authors:
Xiao Wan-Sheng
E-mail: wsxiao@gig.ac.cn
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Cite this article:
Tan Da-Yong (谭大勇), Xiao Wan-Sheng (肖万生), Zhou Wei (周微), Chen Ming (陈鸣), Xiong Xiao-Lin (熊小林), Song Mao-Shuang (宋茂双 ) First-order character of the displacive structural transition in BaWO4 2012 Chin. Phys. B 21 086201
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