High-pressure single crystal X-ray diffraction and FT-IR observation of natural chondrodite and synthetic OH-chondrodite

スポンサーリンク

概要

• 論文の詳細を見る

• High-pressure single crystal X-ray diffraction studies of a natural chondrodite, Mg4.76Fe0.22Ti0.02Si1.99O8(OH1.26F0.74), and a synthetic OH-chondrodite, Mg4.98Si2.01H2.00O10, were performed using a diamond anvil cell (DAC) up to 7.3 and 5.9 GPa, respectively and at room temperature. FT-IR spectra of the natural chondrodite under high-pressure conditions up to 9.9 GPa was also observed using a DAC. The axial linear compressibilities of these samples are calculated as βa = 1.69(4) × 10−3, βb = 2.98(4) × 10−3 and βc = 2.74(5) × 10−3 (GPa−1) for the natural chondrodite and βa = 2.11(18) × 10−3, βb = 2.83(18) × 10−3 and βc = 3.04(38) × 10−3 (GPa−1) for the synthetic OH-chondrodite. The isothermal bulk moduli of these samples were calculated as KT = 124.1(4) GPa for the natural chondrodite and KT = 117(2) GPa for the OH-chondrodite, by using the Birch-Murnaghan equation of state assuming K = 4. The bulk moduli of total void space in each sample, assuming K = 4, were calculated to be K⌊ = 116(2) GPa for the natural chondrodite and K⌊ = 113(4) GPa for the OH-chondrodite. The plots of bulk modulus versus the summation of the filling-factor of polyhedral sites show a good correlation between the humite minerals. This relationship can be explained by the replacement of 4O2− + Si4+ ⇔ 4(F, OH)− + ⌊ generated in the humite homologous series. In the FT-IR spectra of the natural chondrodite, four OH-stretching vibrational peaks were observed at 3688, 3566, 3558 and 3383 cm−1 under ambient conditions. The pressure dependences of the frequency of these peaks up to 9.9 GPa are 2.8(3), 3.9(3), 4.0(3) and −2.1(2) (cm−1GPa−1), respectively. With increasing pressure up to 9.9 GPa, the 3383 cm−1 peak shifts to lower-frequency positions, whereas the other peaks shift to higher-frequency positions. The shortening of the O5···O5 distance, which is not the shared edge between M3 octahedra, related to hydrogen bonding with increasing pressure causes the negative pressure-dependence of the 3383 cm−1 peak. The positive pressure-dependence of the remaining IR-peaks is due to the compression of the O5-H bond, and not related to hydrogen bonding with increasing pressure.

• 日本鉱物科学会の論文
• 2004-06-01

著者

• KAGI Hiroyuki

  Laboratory for Earthquake Chemistry, Graduate School of Science, The University of Tokyo

• TANAKA Masahiko

  Institute of Materials Structure Science, High Energy Accelerator Research Organization

• Tanaka Masahiko

  Institute Of Materials Structure Science High Energy Accelerator Research Organization

• Kagi Hiroyuki

  Laboratory For Earthquake Chemistry Graduate School Of Science The University Of Tokyo

• Kudoh Yasuhiro

  Institute Of Mineralogy Petrology And Economic Geology Faculty Of Science Tohoku University

• Kudoh Yasuhiro

  Institute Of Mineralogy Petrology And Economic Geology Tohoku University

• KURIBAYASHI Takahiro

  Institute of Mineralogy, Petrology, and Economic Geology, Faculty of Science, Tohoku University

• AKIZUKI Mizuhiko

  Institute of Mineralogy, Petrology and Economic Geology, Graduate School of Science, Tohoku Universi

• Kagi H

  Laboratory For Earthquake Chemistry Faculty Of Science University Of Tokyo

• Akizuki Mizuhiko

  Institute Of Mineralogy Petrology And Economic Geology Graduate School Of Science Tohoku University

• Kuribayashi Takahiro

  Institute Of Mineralogy Petrology And Economic Geology Faculty Of Science Tohoku University

関連論文

• Chemical compositions and XANES speciations of Fe, Mn and Zn from aerosols collected in China and Japan during dust events
• Oxidation States of Ytterbium Incorporated in Calcium Carbonate and Calcium Fluoride
• Spontaneously Induced Reduction of Trivalent Ytterbium in Synthesized Crystal of Calcite
• High Yield of Vaterite Precipitation Induced by Trace Lanthanum Ion from a Supersaturated Solution of Calcium Carbonate at 50℃
• Inhibiting Effects of Trace Amounts of Lanthanum Ion on the Dissolution of Calcite : A Comparative Study on Calcium Carbonate Polymorphs
• Effects of Trace Lanthanum Ion on the Stability of Vaterite and Transformation from Vaterite to Calcite in an Aquatic System
• Observation of Soft Phonon Modes in 1T-TaS_2 by means of X-ray Thermal Diffuse Scattering(Condensed Matter : Structure, Mechanical and Thermal Properties)
• Compositional Dependence of X-Ray Absorption Spectra on Magnetic Circular Dichroism and Near-Edge Structure at Co K Edge in La_Sr_xCoO_3 (0≦x≦0.6)
• Site-Specific Studies on X-Ray Magnetic Circular Dichroism at Fe K Edge for Transition-Metal Ferrites
• Pressure dependence of u parameter in ringwoodite up to 7.9GPa
• High-pressure single crystal X-ray diffraction and FT-IR observation of natural chondrodite and synthetic OH-chondrodite
• Cation vacancies and possible hydrogen atom positions in Fe-bearing hydrous forsterite, Mg_Fe_Si_H_O_4, synthesized at 13.5GPa and 1400℃
• Cation vacancy and possible hydrogen positions in hydrous forsterite, Mg_Si_H_O_4, synthesized at 13.5GPa and 1300℃
• Orientational ordering of three SiO_4 tetrahedra in α'_L-Ca_Sr_SiO_4 that satisfies bond-valence requirements and avoids O-O repulsion
• Mid-infrared transmission spectra of individual Antarctic micrometeorites and carbonaceous chondrites
• The partially dehydrated structure of natural heulandite : An in situ high temperature single crystal X-ray diffraction study
• Compressibility of phase A, Mg_7Si_2H_6O_ up to 11.2 GPa
• Effect of temperature and pressure on the crystal structure of topaz, Al_2Sio_4(OH,F)_2
• Stability of dense hydrous magnesium silicate phase G in the transition zone and the lower mantle
• Crystal structural features of hydrous forsterite : Effect of Fe on the M-site vacancies, possible hydrogen positions and variation of the unit cell dimensions
• Mid infrared throughput with 5 μm aperture for H_2O determination of an andesitic glass:Comparison of synchrotron radiation source at SPring-8 with conventional light sources
• Dynamic Light Scattering Study of the Inhibiting Effect on Crystal Growth of Calcium Carbonate
• Raman frequencies of graphitic carbon in Antarctic ureilites
• In-situ micro Raman studies on graphitic carbon in some Antarctic ureilites
• Speciation study of Cr(？/？) reacting with humic substances and determination of local structure of Cr binding humic substances using XAFS spectroscopy
• Compositional Dependence of X-Ray Absorption Spectra on Magnetic Circular Dichroism and Near-Edge Structure at Co $K$ Edge in La1-xSrxCoO3 ($0\leq x\leq 0.6$)
• Observation of Soft Phonon Modes in 1T-TaS_2 by means of X-ray Thermal Diffuse Scattering(Condensed Matter : Structure, Mechanical and Thermal Properties)
• Pressure dependence of u parameter in ringwoodite up to 7.9 GPa

もっと見る 閉じる

スポンサーリンク