RAMAN STUDIES ON THE PHASE TRANSITIONS OF (NH4)2SnBr6 CRYSTALS

doi:10.1088/1004-423X/4/9/006

中国物理B ›› 1995, Vol. 4 ›› Issue (9): 682-690.doi: 10.1088/1004-423X/4/9/006

RAMAN STUDIES ON THE PHASE TRANSITIONS OF (NH₄)₂SnBr₆ CRYSTALS

徐永晨¹, 张家明², 沈学础²

(1)Bohl Institute of Soild State Physics, Tongji University, Shanghai 200092, China; (2)State Key Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Academia Sinica, Shanghai 200083, China

收稿日期:1994-08-31 出版日期:1995-09-20 发布日期:1995-09-20

RAMAN STUDIES ON THE PHASE TRANSITIONS OF (NH₄)₂SnBr₆ CRYSTALS

ZHANG JIA-MING (张家明)^a, SHEN XUE-CHU (沈学础)^a, XU YONG-CHEN (徐永晨)^b, J. PELZL^c

^a State Key Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Academia Sinica, Shanghai 200083, China; ^b Bohl Institute of Soild State Physics, Tongji University, Shanghai 200092, China; ^c Institute of Experimental Physics, Ruhr University, W-4630 Bochum, Germany

Received:1994-08-31 Online:1995-09-20 Published:1995-09-20

摘要/Abstract

摘要： We report here the structural phase transitions of the crystal (NH₄)₂SnBr₆ investigated by Raman scattering at temperatures ranging from 10K to room temperature. Two phase transitions occurring at 150 and ll0K are found. Based on the group theory, it is proposed that the crystal undergoes a second-order phase transition at 150 K, resulting from a ferro-distortion with symmetry Γ⁴⁺. The change of structure is confirmed to be O⁵_h to C⁵_4h, which is assigned to the rotary of [SnBr₆]^2- ion groups around the axis of <001>. Furthermore the crystal undergoes an order-disorder phase transition at ll0K which is related with the reorientation of the ammonium ion group. It is noticed that the change of the vibrational modes at 77K does not show any phase transition.

Abstract: We report here the structural phase transitions of the crystal (NH₄)₂SnBr₆ investigated by Raman scattering at temperatures ranging from 10K to room temperature. Two phase transitions occurring at 150 and ll0K are found. Based on the group theory, it is proposed that the crystal undergoes a second-order phase transition at 150 K, resulting from a ferro-distortion with symmetry $\varGamma$⁴⁺. The change of structure is confirmed to be O⁵_h to C⁵_4h, which is assigned to the rotary of [SnBr₆]^2- ion groups around the axis of. Furthermore the crystal undergoes an order-disorder phase transition at ll0K which is related with the reorientation of the ammonium ion group. It is noticed that the change of the vibrational modes at 77K does not show any phase transition.

中图分类号:

64.70.K-

81.30.Hd (Constant-composition solid-solid phase transformations: polymorphic, massive, and order-disorder) 78.30.Hv (Other nonmetallic inorganics) 61.50.Ah (Theory of crystal structure, crystal symmetry; calculations and modeling)

张家明, 沈学础, 徐永晨. RAMAN STUDIES ON THE PHASE TRANSITIONS OF (NH₄)₂SnBr₆ CRYSTALS[J]. 中国物理B, 1995, 4(9): 682-690.

ZHANG JIA-MING (张家明), SHEN XUE-CHU (沈学础), XU YONG-CHEN (徐永晨), J. PELZL. RAMAN STUDIES ON THE PHASE TRANSITIONS OF (NH₄)₂SnBr₆ CRYSTALS[J]. Acta Physica Sinica (Overseas Edition), 1995, 4(9): 682-690.

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RAMAN STUDIES ON THE PHASE TRANSITIONS OF (NH₄)₂SnBr₆ CRYSTALS

RAMAN STUDIES ON THE PHASE TRANSITIONS OF (NH₄)₂SnBr₆ CRYSTALS

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