X-ray, DTA and Raman studies of monoclinic tridymite and its higher temperature orthorhombic modification with varying temperature

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概要

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• Unit cell parameters, Raman scattering profiles and DTA curves were measured on monoclinic tridymite from fired silica brick. Ten peaks appear in the Raman measurements from 100 to 1250 cm1 at 25 C, and their positions and widths show no significant change up to 110 C. The monoclinic unit cell parameters, a, b, c and β, slightly increase or remain nearly constant with increasing temperatures up to 110 C. Both the Raman spectra and the unit cell parameters undergo significant changes in the range from 110 to 115 C. Only two endothermic peaks, at 117 and 166 C, appear in the DTA curve measured on a powdered sample of nearly pure monoclinic phase in a heating run from 25 to 300 C. In X ray single crystal refinements, the structural parameters including anisotropic temperature factors of atoms were fully determined for the monoclinic phase at 25, 80, 90 and 100 C, and the orthorhombic phase at 140 C. The difference between the temperature factors on both sides of the transition point is the most remarkable: 0.0286 A2 in average for all O atoms at 100 C in the monoclinic phase and 0.0713 A2 at 140 C, both for Beq. The averaged Si O distances calculated for the atomic mean positions decrease with increasing temperatures: 1.599 A at 25 C, 1.595 A at 100 C and 1.576 A at 140 C, whereas the values corrected for the thermal displacement parameters remain unchanged at 1.61 A through all the temperatures studied.

• 日本岩石鉱物鉱床学会 = Japanese association of Mineralogistsの論文
• 2005-04-01

著者

• Okuno Masayuki

  Department Of Earth Sciences Faculty Of Science Kanazawa University

• Okuno Masayuki

  Dep. Of Earth Sciences Fac. Of Sci. Kanazawa Univ.

• KIHARA Kuniaki

  Department of Earth Sciences, Kanazawa University

• FUJINAMI Syuhei

  Department of Chemistry, Kanazawa University

• Shinoda Keiji

  Dep. Of Geosciences Graduate School Of Sci. Osaka City Univ.

• Shinoda Keiji

  Department Of Geosciences Faculty Of Science Osaka City University

• Kihara Kuniaki

  Department Of Earth Sciences Kanazawa University

• Fujinami Shuhei

  Department Of Chemical Science Graduate School Of Natural Science And Technology Kanazawa University

• HIROSE Tadayuki

  Department of Earth Sciences, Kanazawa University

• Fujinami Syuhei

  Department Of Chemistry Kanazawa University

• Hirose Tadayuki

  Department Of Earth Sciences Kanazawa University

• OKUNO Masayuki

  Department of Earth Science, Graduate School of Science and Technology, Kanazawa University

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