1996 Fiscal Year Annual Research Report

包晶反応を用いた新しい結晶育成法の開発

Research Project

Project/Area Number	07455003
Research Institution	Osaka University, Graduate School of Science
Principal Investigator	武居文彦大阪大学, 大学院・理学研究科, 教授 (60005981)
Co-Investigator(Kenkyū-buntansha)	大高理大阪大学, 大学院・理学研究科, 助教授 (40213748)
Keywords	結晶成長 / 包晶反応 / 酸化物超伝導体 / 低次元磁性体 / 金属性酸化物電導体 / 鎖状硅酸塩 / 二次元三角格子磁性体 / 一次元磁性体
Research Abstract	溶液反応結晶成長法の一種である包晶反応を利用した新しい方法により分解溶融型化合物の単結晶を作成し、組成、構造、物性の関係を明らかにした。物質としては極端な異方性を示すと考えられる低次元系酸化物、すなわち酸化物超伝導体、低次元磁性体、低次元伝導体、鎖状珪酸塩などを取りあげた。研究の結果は以下通りである。1)タリウム系超伝導体単結晶の育成に成功し、構造変化とTcとの関係を明らかにした。2)新しい超伝導化合物Tl_2Ba_5Cu_4O_xを発見し、単結晶により構造、物性を明らかにした。3)その場観察のできる時間分割高温X線粉末解析装置を開発し、1000℃までのビスマス系超伝導体の相関係を決定した。またイットリウム系超伝導体の結晶成長における包晶反応の速度論的解析を行った。5)良質・大形のイットリウム系超伝導体単結晶の育成と双晶の除去に成功し、磁気ピン止め効果を評価した。また、各主軸方向の異方的物性を独立して決定した。6)一次元物質SrCuO_2の良質結晶の育成に成功し、その精密結晶、磁気構造を解析した。7)良質針状のY_2Cu_2O_5結晶も同様の包晶反応を利用した方法で育成し、物性を測定した。8)二次元三角格子磁性体CuFeO_2の相関係を調べ、自己フラックスによる大形良質単結晶を育成し、組成、構造、帯磁率と育成雰囲気条件ととの関係を調べた。9)低次元金属伝導体PdCoO_2結晶を封管内での複分解法で得、異方的特性を明らかにした。10)トップ・シ-ド溶液成長法を改良し、鎖状構造マグネシウム輝石の大形良質結晶の育成を行った。以上の実験の他も含めた総合的な研究成果から、熱分解を伴うような高温で不安定な物質の単結晶合成には、包晶反応など化学反応を利用した結晶育成法の優れていることが判明した。今後はさらに育成例を増やすと同時に、成長機構のさらなる究明が課題といえよう。

Research Products
(26 results)

All Other

All Publications (26 results)

[Publications] M.Hasegawa et al.: "A new high-Tc cuprate superconductor Tl_2Ba_5Cu_4O_x--Growth,structure and supeconductivity." Physica C. 285. 341-348 (1996)
[Publications] T,R.Zhao et al.: "Crystal growth and characterization of cuprous ferrite(CuFeO_2)." J.Crystal Growth. 166. 408-413 (1996)
[Publications] T.Suzuki et al.: "In-situ observation of phase changes by X-ray diffraction in the Bi-Sr-Ca-Cu-O system." J.Crystal Growth. 166. 872-877 (1996)
[Publications] T.R.Zhao et al.: "Phase equilibrium of the Cu-Fe-O system under Ar,CO_2 and Ar+ 0.5% O2 atmospheres during CuFeO_2 single-crystal growth." J.Mateials Sci.31. 5657-5663 (1996)
[Publications] H.Asaoka et al.: "Effect of twin boundaries on flux pinning in YBa_2Cu_3O_x single crystals." Physica C. 268. 14-20 (1996)
[Publications] S.Kimura et al.: "Submillimeter wave ESR measurements of single crystal Y_2Cu_2O_5." Int.J.Infrared and MMW. 17. 833-841 (1996)
[Publications] M.Tanaka et al.: "Growth and anisotropic physical properties of SrCuO_2 single crystals." Physica C. 261. 309-314 (1996)
[Publications] T.Ishida et al.: "Anisotropy of superconductivity in,an untwinned YBa_2Cu_3O_7 single crystal." Physica C. 263. 260-263 (1996)
[Publications] M.Hasegawa et al.: "Local structure changes in Tl_2Ba_2Ca_2Cu_3O_<10> single crystal between 90K and 290K." Physica C. 267. 31-44 (1996)
[Publications] M.Tanaka et al.: "Growth and anisotropic physical properties of PdCoO_2 single crystals." J.Phys.Soc.Jpn. 65. 3973-3977 (1996)
[Publications] Z.Yan et al.: "Preparation of spinel ZnGa_2O_4 films on MgO substrates by the method of solvent evaporation epitaxy(SEE)." J.Crystal Growth. 165. 183-186 (1996)
[Publications] N.Kobayashi et al.: "Magnetization and flux pinning in YBa_2Cu_3O_y single crystals." Chinese J.Phys.,Taiwan. 34. 514-521 (1996)
[Publications] T.Nishizaki et al.: "Magnetization Jump and the vortex-lattice melting transition in YBa_2Cu_3O_y." Phys.Rev.B. 53. 82-85 (1996)
[Publications] A.Maeda et al.: "Nonlinear Meissner effect of the cuprate superconductors investigated by the London penetration depth measurement." Physica C. 263. 438-441 (1996)
[Publications] M.Hasegawa et al.: "Magnetic states of tetragonal La_2NiO_<4+δ>(δ=0.156,0.181,0.186)single crystals with excess oxygen in peroxide form." Physica B. 226. 375-380 (1996)
[Publications] T,R.Zhao et al.: "High pressure X-ray diffraction study of CuFeO_2." Jpn.J.Appl.Phys.35. 3535-3536 (1996)
[Publications] S.Sakamoto et al.: "Josephson plasma resonance in a single-layered cuprate Bi_2(Sr,La)_2CuO_y." Phys.Rev.B. 53. R14749-14752 (1996)
[Publications] Y.Onodera et al.: "Magnetization jump due to the first-order vortex lattice melting transition in YBa_2Cu_3O_y single crystals." Physica C. 263. 406-411 (1996)
[Publications] S.Kimura et al.: "Submillimeter-wave electron spin-resonance measurements for single crystal Y_2Cu_2O_5." J.Phys.i condensed Matter.8. 5461-5473 (1996)
[Publications] H.Takei et al.: "Thermal expansions of pure and Al-doped CsLiB_6O_<10> crystals for nonlinear optical applications." Jpn.J.Appl.Phys.36. 126-128 (1997)
[Publications] T.R,Zhao et al.: "Oxygen nonstoichiometry in CuFeO_<2+δ> single crystals." J.Solid State Chem.,. (in press).
[Publications] F.Marumo et al.: "Electron distribution in cobalt olivine." Mineralogical J.(in press).
[Publications] M.Tanaka et al.: "Spin-glass-like behavior of manganese-doped PdCoO_2 single crystals." Physica C,. (in press).
[Publications] M.Tanaka et al.: "Crystal growth of PdCoO_2,,PtCoO_2 and their solid-solution with delafossite structure." J,Crystal Growth,. (in press).
[Publications] T.Tanaka et al.: "Growth of MgSiO_3 orthoenstatite single crystals by the top-seeded solution growth(TSSG)method." J,Crystal Growth,. (in press).
[Publications] M.Mamiya et al.: "In-situ observation on the thermal stability field of Bi_2Sr_3Cu_2O_8." Physica C,. (in press).

1996 Fiscal Year Annual Research Report

包晶反応を用いた新しい結晶育成法の開発

Principal Investigator

武居 文彦 大阪大学, 大学院・理学研究科, 教授 (60005981)

Research Products

[Publications] M.Hasegawa et al.: "A new high-Tc cuprate superconductor Tl_2Ba_5Cu_4O_x--Growth,structure and supeconductivity." Physica C. 285. 341-348 (1996)

[Publications] T,R.Zhao et al.: "Crystal growth and characterization of cuprous ferrite(CuFeO_2)." J.Crystal Growth. 166. 408-413 (1996)

[Publications] T.Suzuki et al.: "In-situ observation of phase changes by X-ray diffraction in the Bi-Sr-Ca-Cu-O system." J.Crystal Growth. 166. 872-877 (1996)

[Publications] T.R.Zhao et al.: "Phase equilibrium of the Cu-Fe-O system under Ar,CO_2 and Ar+ 0.5% O2 atmospheres during CuFeO_2 single-crystal growth." J.Mateials Sci.31. 5657-5663 (1996)

[Publications] H.Asaoka et al.: "Effect of twin boundaries on flux pinning in YBa_2Cu_3O_x single crystals." Physica C. 268. 14-20 (1996)

[Publications] S.Kimura et al.: "Submillimeter wave ESR measurements of single crystal Y_2Cu_2O_5." Int.J.Infrared and MMW. 17. 833-841 (1996)

[Publications] M.Tanaka et al.: "Growth and anisotropic physical properties of SrCuO_2 single crystals." Physica C. 261. 309-314 (1996)

[Publications] T.Ishida et al.: "Anisotropy of superconductivity in,an untwinned YBa_2Cu_3O_7 single crystal." Physica C. 263. 260-263 (1996)

[Publications] M.Hasegawa et al.: "Local structure changes in Tl_2Ba_2Ca_2Cu_3O_<10> single crystal between 90K and 290K." Physica C. 267. 31-44 (1996)

[Publications] M.Tanaka et al.: "Growth and anisotropic physical properties of PdCoO_2 single crystals." J.Phys.Soc.Jpn. 65. 3973-3977 (1996)

[Publications] Z.Yan et al.: "Preparation of spinel ZnGa_2O_4 films on MgO substrates by the method of solvent evaporation epitaxy(SEE)." J.Crystal Growth. 165. 183-186 (1996)

[Publications] N.Kobayashi et al.: "Magnetization and flux pinning in YBa_2Cu_3O_y single crystals." Chinese J.Phys.,Taiwan. 34. 514-521 (1996)

[Publications] T.Nishizaki et al.: "Magnetization Jump and the vortex-lattice melting transition in YBa_2Cu_3O_y." Phys.Rev.B. 53. 82-85 (1996)

[Publications] A.Maeda et al.: "Nonlinear Meissner effect of the cuprate superconductors investigated by the London penetration depth measurement." Physica C. 263. 438-441 (1996)

[Publications] M.Hasegawa et al.: "Magnetic states of tetragonal La_2NiO_<4+δ>(δ=0.156,0.181,0.186)single crystals with excess oxygen in peroxide form." Physica B. 226. 375-380 (1996)

[Publications] T,R.Zhao et al.: "High pressure X-ray diffraction study of CuFeO_2." Jpn.J.Appl.Phys.35. 3535-3536 (1996)

[Publications] S.Sakamoto et al.: "Josephson plasma resonance in a single-layered cuprate Bi_2(Sr,La)_2CuO_y." Phys.Rev.B. 53. R14749-14752 (1996)

[Publications] Y.Onodera et al.: "Magnetization jump due to the first-order vortex lattice melting transition in YBa_2Cu_3O_y single crystals." Physica C. 263. 406-411 (1996)

[Publications] S.Kimura et al.: "Submillimeter-wave electron spin-resonance measurements for single crystal Y_2Cu_2O_5." J.Phys.i condensed Matter.8. 5461-5473 (1996)

[Publications] H.Takei et al.: "Thermal expansions of pure and Al-doped CsLiB_6O_<10> crystals for nonlinear optical applications." Jpn.J.Appl.Phys.36. 126-128 (1997)

[Publications] T.R,Zhao et al.: "Oxygen nonstoichiometry in CuFeO_<2+δ> single crystals." J.Solid State Chem.,. (in press).

[Publications] F.Marumo et al.: "Electron distribution in cobalt olivine." Mineralogical J.(in press).

[Publications] M.Tanaka et al.: "Spin-glass-like behavior of manganese-doped PdCoO_2 single crystals." Physica C,. (in press).

[Publications] M.Tanaka et al.: "Crystal growth of PdCoO_2,,PtCoO_2 and their solid-solution with delafossite structure." J,Crystal Growth,. (in press).

[Publications] T.Tanaka et al.: "Growth of MgSiO_3 orthoenstatite single crystals by the top-seeded solution growth(TSSG)method." J,Crystal Growth,. (in press).

[Publications] M.Mamiya et al.: "In-situ observation on the thermal stability field of Bi_2Sr_3Cu_2O_8." Physica C,. (in press).

武居文彦大阪大学, 大学院・理学研究科, 教授 (60005981)