1998 Fiscal Year Annual Research Report

上部マントル構成鉱物の超高圧高温下での熱拡散率測定

Research Project

Project/Area Number	09440188
Research Institution	Okayama University
Principal Investigator	桂智男岡山大学, 固体地球研究センター, 助教授 (40260666)
Co-Investigator(Kenkyū-buntansha)	神崎正美岡山大学, 固体地球研究センター, 助教授 (90234153)
Keywords	熱拡散率 / 高温高圧 / 安定化ジルコニア
Research Abstract	本年は、安定化ジルコニアの熱拡散率を測定した。測定圧力は1GPa、温度は350-1600Kである。この安定化ジルコニアの化学組成はCaO:8%、ZrO_2:92%であり、比重は4.59x10^3kg/m^3である。測定には円筒対称系でのオングストローム法を用いた。シグナルの正弦波の周期は4秒と2秒である。測定結果では、350Kから800Kまでは熱拡散率は温度と共に1.4x10^<-6>m^2/sから9x10^<-8>m^2/s減少した。これは格子伝導の特徴であり、この温度領域では、主な熱輸送メカニズムは格子伝導であることが分かる。800K以上では、熱拡散率は温度と共に上昇する。これは輻射伝導の特徴である。常圧下で測定した文献値(Rudkin etal.)に比べると輻射伝導の効果が顕著である。これは封圧によって結晶粒界がくっつき、輻射の散乱が減少したためと考えられる。また、絶対値自身もRudkin et al.より50%以上おおきく、Rudkin et al.の測定では、余分な熱抵抗の影響が入っていると考えられる。今回決定した熱拡散率と比熱・比重の値から熱伝導率を計算すると2.6-4.2W/mKとなる。この値は、低温ではマグネシアの1/10、高温では1/3である。膳温度領域を通じてカンラン石と同じ程度である。

Research Products

(11 results)

All Other

All Publications (11 results)

[Publications] Katsura,T.: "Electric conductivity of silicate perovskite at lower mantle conditions" Nature. 395. 493-495 (1998)
[Publications] Katsura,T.: "Postspinel transition in Fe2SiO4" Properties of Earth & Planetary Materials at High Pressure and Temperature Geophysical Monograph,101,ed.by Murli H.Manghnani & Takehiko Yagi. 101. 435-440 (1998)
[Publications] Katsura,T.: "Electrical conductivity measurement of minerals at high pressures and high temperatures" Rev.High Pressure Sci.Technol.7. 18-21 (1998)
[Publications] Irifune,T.: "Postspinel phase boundary in Mg2SiO4 determined by in situ X-ray measurement" Sicence. 279. 1698-1700 (1998)
[Publications] Ito,E.: "High-pressure transformation of Pyrope (Mg3Al2Si3O12) in a sintered diamond cubic anvil assembly" Geophys,Res.Lett.25. 821-824 (1998)
[Publications] Ito,E.: "Metal/Silicate partitioning of Mn,Co and Ni at high pressure and high temperature" Properties of Earth & Planetary Materials at High Pressure and Temperature Geophysical Monograph,101,ed.by Murli H.Manghnani & Takehiko Yagi. 101. 215-225 (1998)
[Publications] Sinogeikin,S.: "Sound velocities and Elastic Properties of Fe-bearing wadsleyite and ringwoodite" J.Geophys.Res.103. 20819-20826 (1998)
[Publications] Kanzaki,M.: "Phase relations in Na2O-SiO2 and K2Si4O9 systems up to 14 GPa and 29Si NMR study of the new high-pressure phases:Implications to the structure of high-pressure silicate glasses" Phys.Earth Planet.Int.107. 9-21 (1998)
[Publications] Kudo,Y.: "Crystal chemical characteristics of alpha-CaSi2O5,a new high pressure calcium silicate with five-coordinated silicon synthesized at 1500°C and 10 GPa" Phys.Chem.Minerals. 25. 429-433 (1998)
[Publications] Xue,X.: "Correlations between 29Si,17O and 1H NMR properties and local structures in silicates: and ab initio calculation" Phys.Chem.Minerals. 26. 14-30 (1998)
[Publications] Kanzaki,M.: "A computer simulation approach for the prediction of trace element partition between crystal and melt" "Physics Meets Mineral"(Cambrige University Press). (in press). (1998)

1998 Fiscal Year Annual Research Report

上部マントル構成鉱物の超高圧高温下での熱拡散率測定

Principal Investigator

桂 智男 岡山大学, 固体地球研究センター, 助教授 (40260666)

Research Products

[Publications] Katsura,T.: "Electric conductivity of silicate perovskite at lower mantle conditions" Nature. 395. 493-495 (1998)

[Publications] Katsura,T.: "Postspinel transition in Fe2SiO4" Properties of Earth & Planetary Materials at High Pressure and Temperature Geophysical Monograph,101,ed.by Murli H.Manghnani & Takehiko Yagi. 101. 435-440 (1998)

[Publications] Katsura,T.: "Electrical conductivity measurement of minerals at high pressures and high temperatures" Rev.High Pressure Sci.Technol.7. 18-21 (1998)

[Publications] Irifune,T.: "Postspinel phase boundary in Mg2SiO4 determined by in situ X-ray measurement" Sicence. 279. 1698-1700 (1998)

[Publications] Ito,E.: "High-pressure transformation of Pyrope (Mg3Al2Si3O12) in a sintered diamond cubic anvil assembly" Geophys,Res.Lett.25. 821-824 (1998)

[Publications] Ito,E.: "Metal/Silicate partitioning of Mn,Co and Ni at high pressure and high temperature" Properties of Earth & Planetary Materials at High Pressure and Temperature Geophysical Monograph,101,ed.by Murli H.Manghnani & Takehiko Yagi. 101. 215-225 (1998)

[Publications] Sinogeikin,S.: "Sound velocities and Elastic Properties of Fe-bearing wadsleyite and ringwoodite" J.Geophys.Res.103. 20819-20826 (1998)

[Publications] Kanzaki,M.: "Phase relations in Na2O-SiO2 and K2Si4O9 systems up to 14 GPa and 29Si NMR study of the new high-pressure phases:Implications to the structure of high-pressure silicate glasses" Phys.Earth Planet.Int.107. 9-21 (1998)

[Publications] Kudo,Y.: "Crystal chemical characteristics of alpha-CaSi2O5,a new high pressure calcium silicate with five-coordinated silicon synthesized at 1500°C and 10 GPa" Phys.Chem.Minerals. 25. 429-433 (1998)

[Publications] Xue,X.: "Correlations between 29Si,17O and 1H NMR properties and local structures in silicates: and ab initio calculation" Phys.Chem.Minerals. 26. 14-30 (1998)

[Publications] Kanzaki,M.: "A computer simulation approach for the prediction of trace element partition between crystal and melt" "Physics Meets Mineral"(Cambrige University Press). (in press). (1998)

桂智男岡山大学, 固体地球研究センター, 助教授 (40260666)