1999 Fiscal Year Annual Research Report

回析的手法(放射光および高分解能電子顕微鏡等)による相変態の研究手法の開発

Research Project

Project/Area Number	09242102
Research Institution	Tohoku University
Principal Investigator	平賀賢二東北大学, 金属材料研究所, 教授 (30005912)
Co-Investigator(Kenkyū-buntansha)	大嶋建一筑波大学, 物理工学系, 教授 (70109271) 進藤大輔東北大学, 素材工学研究所, 教授 (20154396)
Keywords	相変態 / X線回析 / エネルギーフィルター / 電子状態 / エネルギー損失分光法 / 準結晶 / マルテンサイト / 散漫散乱
Research Abstract	本年度の研究成果は次のように纏められる。 1.X線回析―電気抵抗同時測定できるシステムの開発を行った。それをAu-47.5at.%Cd-0.75at.Cu合金の相変態に応用した結果、Msの値は両測定共一致したが、相変態終了温度Mfまでの温度範囲は電気抵抗の場合の方がX線回析の場合より広いことが分かった。 2.回転対陰極型X線源(理学電機製)にHuber社の2軸回析計にヘリウム循環型冷凍器を組み込み、格子定数の温度変化の精密測定装置を開発した。測定装置の温度の安定性は0.1度以内である。既知の試料の格子定数の測定から、有効数字は5桁まで一致した。 3.汎用の透過電子顕微鏡のオメガ型のマグネットを導入し、電子分光型電子顕微鏡を開発した。エネルギーフィルターの利用によって、非弾性散乱に伴う電子回析図形のバックグランドが軽減でき、これまで解析が困難であった相変態に伴う弱い散漫散乱の強度変化を定量的に評価することができた。 4.相変態に伴う電子状態の微弱な変化を検出するため、合金や酸化物の構成元素、特に遷移金属に注目し、2pから3dへの電子励起に伴う内殻電子励起スペクトルの変化を高精度で測定し解析する手法を開発した。 5.従来の高分解能電子顕微鏡と新しい手法であるHADF法の併用によって、新しい構造解析を試みた。Al-Ni-Ru正10角形準結晶の構造の決定と、CsCl超体心立方格子の準結晶を初めてみいだした。

Research Products
(15 results)

All Other

All Publications (15 results)

[Publications] Ha-Guk Jeong, et al.: "Martensitic transformation of yuria-stabilized zirconia polycrystasl during superplastic deformation"Proc. inter. Conf. On Solid-Solid Phase Transformations '99 (JIMIC-3)891. 891-894 (1999)
[Publications] Z Liu, et al.: "The observation of phase transformation by HDDR process in Sm-Fe-B-Ti system"Proc. Inter. Conf. On Solid-Solid Phase Transformations '99 (JIMIC-3). 220-232 (1999)
[Publications] Z Liu, et al.: "A Regular Arrangement of SmH_2 Fibers in an α-Fe Matrix, Found after the Hydrogenation-Disproportionation Processing of Sm_2Fe_<17>"Phil. Mag. Lett.. 79. 729-734 (1999)
[Publications] S Ritsch, et al.: "Pentagonal Al-Co-Ni Quasicrystal with a Superstructure"Phil. Mag. Lett.. 79. 225-232 (1999)
[Publications] Z.Liu, et at.: "Structure Change in Sm-Fe-B-Ti Permanent Magnet Materials Induced by HDDR Process"J. Alloys and Comp.. 288. 277-285 (1999)
[Publications] H.Saitoh, et al.: "Kinetics of martensitic transformations in Au-Cd alloys"Proceedings of the International Conference on Solid-Solid Phase Transformations '99 (JIMIC-3). 939-942 (1999)
[Publications] M.Takahashi, et al.: "Atomic and magnetic short-range order in Pt-8.8 at.% Mn spin-glass alloy"Phys. Rev.. B61. 3528-3533 (2000)
[Publications] H.Shigematsu: "Neutron diffraction study on the low-temperature phase transitions in Rb_2ZnBr_4 under hydrostatic pressure"J. Korean Phys. Soc.. 35. S1426 (1999)
[Publications] T.Kusawake, et al.: "X-ray structural study of in-plane atomic arrangements in the compounds Cu_xTiS_2"J. Phys : Condens. Mat.. 11. 6121 (1999)
[Publications] Y.Ikematsu, et al.: "Quantitative Analysis of Short-Range Order Diffuse Scattering in Cu-27.5at%Pd Alloy with Energy-Filtered Electron Diffraction"Mater. Trans. JIM. 41. 238-241 (2000)
[Publications] Y.Murakami, et al.: "Charge Ordering in Bi_<1-x>Ca_xMnO_3(x【greater than or equal】0.75) Studied by Electron Energy-loss Spectroscopy"Phys. Rev.. B59. 6395-6399 (1999)
[Publications] Y.Murakami, et al.: "Lattice Modulation Preceding to the R-phase Transformation in a Ti_<50>Ni_<48>Fe_2 Alloy Studied by TEM with Energy-Filtering"Mater. Trans. JIM. 40. 1092-1097 (1999)
[Publications] A.Taniyama, et al.: "Evaluation of the Characteristics of a Slow-Scan CCD Camera for a Transmission Electron Microscope"J. Electron Microsc.. 48. 257 (1999)
[Publications] H.Okaniwa, et al.: "Determination of Site Occupancy of Additives X(X=V, Mo, W and Ti) in the Nb-Cr-X Laves Phases by ALCHEMI"Acta Mater.. 47. 1987-1992 (1999)
[Publications] N.Sasaki, et al.: "Computer Simulations for the Growth Process of Peanut-Type Hematite Particles"J. Colloid and Interfaci. Sci.. 213. 121 (1999)

1999 Fiscal Year Annual Research Report

回析的手法(放射光および高分解能電子顕微鏡等)による相変態の研究手法の開発

Principal Investigator

平賀 賢二 東北大学, 金属材料研究所, 教授 (30005912)

Research Products

[Publications] Ha-Guk Jeong, et al.: "Martensitic transformation of yuria-stabilized zirconia polycrystasl during superplastic deformation"Proc. inter. Conf. On Solid-Solid Phase Transformations '99 (JIMIC-3)891. 891-894 (1999)

[Publications] Z Liu, et al.: "The observation of phase transformation by HDDR process in Sm-Fe-B-Ti system"Proc. Inter. Conf. On Solid-Solid Phase Transformations '99 (JIMIC-3). 220-232 (1999)

[Publications] Z Liu, et al.: "A Regular Arrangement of SmH_2 Fibers in an α-Fe Matrix, Found after the Hydrogenation-Disproportionation Processing of Sm_2Fe_<17>"Phil. Mag. Lett.. 79. 729-734 (1999)

[Publications] S Ritsch, et al.: "Pentagonal Al-Co-Ni Quasicrystal with a Superstructure"Phil. Mag. Lett.. 79. 225-232 (1999)

[Publications] Z.Liu, et at.: "Structure Change in Sm-Fe-B-Ti Permanent Magnet Materials Induced by HDDR Process"J. Alloys and Comp.. 288. 277-285 (1999)

[Publications] H.Saitoh, et al.: "Kinetics of martensitic transformations in Au-Cd alloys"Proceedings of the International Conference on Solid-Solid Phase Transformations '99 (JIMIC-3). 939-942 (1999)

[Publications] M.Takahashi, et al.: "Atomic and magnetic short-range order in Pt-8.8 at.% Mn spin-glass alloy"Phys. Rev.. B61. 3528-3533 (2000)

[Publications] H.Shigematsu: "Neutron diffraction study on the low-temperature phase transitions in Rb_2ZnBr_4 under hydrostatic pressure"J. Korean Phys. Soc.. 35. S1426 (1999)

[Publications] T.Kusawake, et al.: "X-ray structural study of in-plane atomic arrangements in the compounds Cu_xTiS_2"J. Phys : Condens. Mat.. 11. 6121 (1999)

[Publications] Y.Ikematsu, et al.: "Quantitative Analysis of Short-Range Order Diffuse Scattering in Cu-27.5at%Pd Alloy with Energy-Filtered Electron Diffraction"Mater. Trans. JIM. 41. 238-241 (2000)

[Publications] Y.Murakami, et al.: "Charge Ordering in Bi_<1-x>Ca_xMnO_3(x【greater than or equal】0.75) Studied by Electron Energy-loss Spectroscopy"Phys. Rev.. B59. 6395-6399 (1999)

[Publications] Y.Murakami, et al.: "Lattice Modulation Preceding to the R-phase Transformation in a Ti_<50>Ni_<48>Fe_2 Alloy Studied by TEM with Energy-Filtering"Mater. Trans. JIM. 40. 1092-1097 (1999)

[Publications] A.Taniyama, et al.: "Evaluation of the Characteristics of a Slow-Scan CCD Camera for a Transmission Electron Microscope"J. Electron Microsc.. 48. 257 (1999)

[Publications] H.Okaniwa, et al.: "Determination of Site Occupancy of Additives X(X=V, Mo, W and Ti) in the Nb-Cr-X Laves Phases by ALCHEMI"Acta Mater.. 47. 1987-1992 (1999)

[Publications] N.Sasaki, et al.: "Computer Simulations for the Growth Process of Peanut-Type Hematite Particles"J. Colloid and Interfaci. Sci.. 213. 121 (1999)

平賀賢二東北大学, 金属材料研究所, 教授 (30005912)