The Origin of the Nonexistence of Prototypic Paraelastic Phase in (NH_4)_2SO_4

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概要

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• We have found the high-temperature dielectric anonaaly arovrnd 13O'C (V'.) even on first heat-ing of virgin crystal of ferroelastic ammonitrm sulfate (NH,j)380,j. It has been observed by usingp.olarizing microscope that after heat treatnaent above 'Z'. the multigrains appeared in the fer-roelastic domain, indicating that the nattrre of the high-tenaperattrre anomaly around T, is oftopochemistry, i.e., not related to the high-temperature phase transition but related to chemicalchange accompanied by partial thermal decotnposition at the surface of crystals. This worksuggests the origin of nonexistence of prototypic phase in ferroelastic (NH4)2804.

• 社団法人日本物理学会の論文
• 1996-08-15

著者

• Lee Kwang-sei

  Department Of Nano Systems Engineering Center For Nano Manufacturing Inje University

• Kim Jeong-lyong

  Department Of Physics Inje University

関連論文

• Phase Diagram of TlH_2(P_As_x)O_4 Mixed Crystals
• Polarization Dependence of Lattice-Mode Raman Spectra in Rb_(NH_4)_4H_2PO_4 Crystals
• Nature of the High-Temperature Dielectric Anomaly in TlH_2PO_4
• Ferroelastic Domain Structures of the Low-Temperature Phase Transition in TlH_2PO_4
• Dielectric Study on the Low-Temperature Phase Transition of TlH_2 PO_4
• Dielectric Properties of the Phase Transition in TlH_2AsO_4
• New Phase Transition at 155 K and Thermal Stability in KHCO_3
• Neutron Diffraction Analysis of a Single-Crystal Structure of Rb0.51Tl0.49H2PO4
• The Origin of the Nonexistence of Prototypic Paraelastic Phase in (NH_4)_2SO_4
• Crystal Structure of LiH2PO4 Studied by Single-Crystal Neutron Diffraction

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