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1314-18-7Relevant articles and documents
High-pressure synthesis of perovskite-derived compounds in the Sr-Y-Cu-O system
Ono Akira
, (1992)
Three perovskite-derived compounds were found in the Sr-Y-Cu-O system treated at 1.6 GPa. These are Sr3Cu8O2, Sr3.5Y1.5Cu3O2 and Sr4Y3Cu4O14. These compounds are high-pressure phases crystallized in orthorhombic structures. The stabilities of the new compounds depended highly on oxygen pressure. The non-superconducting orthorhombic phase Sr2YCu3O2 was also discovered: It was obtained at a relatively low oxygen pressure. Magnetic susceptibility measurements have revealed that the superconducting transition temperature of Sr2YCu3O2 decreased on lowering the oxygen content.
New series of high-Tc superconductors AlSr2Can-1CunO2n+3 (n = 4, Tc = 110 K; n = 5, Tc = 83 K) prepared at high pressure
Isobe,Kawashima,Kosuda,Matsui,Takayama-Muromachi
, p. 120 - 126 (1994)
A new series of high-Tc superconductors AlSr2Can-1CunO2n+3 (Al-12(n - 1)n) was prepared at high pressure of 5.5 GPa and 1250°C, whose members are the first superconductors including Al as a main component. Two members with n = 4, 5 were obtained in bulk and the former showed superconducting transition at 110 K while the latter at 83 K. They had tetragonal cells with a = 3.839(1), c = 17.72(1) angstrom for n = 4 and a = 3.845(1), c = 20.87(1) angstrom for n = 5. HRTEM observations indicated that they are essentially isomorphous with the Tl (or Hg)-based superconductors, Tl (Hg)-1234 and 1245, respectively. Significant intergrowths of phases with different n values up to n = 8 were observed in Al-1245.
High-pressure synthesis and magnetic properties of the niobio-cuprate Nb0.9Sr2HoCu2.1O7.9
Balamurugan,Yamaura,Takayama-Muromachi
, p. 1206 - 1209 (2008)
Ho-based 1212 niobio-cuprate (Nb-1212Ho) was synthesized for the first time. An off-stoichiometric starting composition Nb0.9Sr2HoCu2.1O7.9 led a phase-pure polycrystalline sample under the synthesis condition at 1450 °C for 2 h at 6 GPa, approximating the true bulk composition. X-ray diffraction pattern clearly indicated an Nb-1212 type structure for the compound with lattice parameters a = b = 3.8505(1) A? and c = 11.574(3) A?, suggesting that the space group P4/mmm is likely for the structure. Unlike Nb-1212Y, the Nb-1212Ho compound showed neither superconductivity nor a magnetic order down to 1.8 K. A relatively large magneto-resistance approximately -7% was found at 30 K.
High-pressure synthesis of the zero-charge-reservoir 0223 superconductor in the Sr-Ca-Cu-O system
Ushiki, Masako,Motohashi, Teruki,Yamauchi, Hisao,Karppinen, Maarit
, p. 167 - 172 (2002)
We have refined the high-pressure synthesis of the zero-charge-reservoir 0223 phase of the Sr-Ca-Cu-O system. Samples were prepared from three different starting cation compositions of Sr2CaCu2O6+y, Sr2Ca2Cu3O8+y and Sr2Ca3Cu4O10+y. The amount of oxygen, y, was controlled by using different amounts of SrO2 in the starting material mixture. With SrO2 of commercial grade, two types of HRTEM images were observed for the a-b plane: one with a double periodicity and another with no periodicity. TEM-EELS analysis revealed that the former was due to carbonate inclusions. Using freshly synthesized SrO2, crystalline samples with Tc ≈ 110 K were obtained. The samples showed body-centered symmetry in ED patterns, being thus of the 0(Sr)2(Ca)23 phase. The actual amount of oxygen in the obtained samples as determined by wet-chemical analysis was found considerably lower than the nominal value. However, the wet-chemical analysis revealed a much higher oxidation state for the 0(Sr)2(Ca)23 phase than generally expected for a high-Tc superconductor.
New oxyfluoride superconductors Sr2Can-1CunO2n+δF2±y (n = 2; Tc = 99 K, n = 3; Tc = 111 K) prepared at high pressure
Kawashima,Matsui,Takayama-Muromachi
, p. 313 - 320 (1996)
We prepared new oxyfluoride superconductors, Sr2CaCu2O4+δF2±y and Sr2Ca2Cu3O6+δF2±y, at 1250 °C under 5.5 GPa. These phases are the n = 2, 3 members of a homologous series, Sr2Can-1CunO2n+δF2±y, respectively, in which the n = 1 phase was reported previously. X-ray and HRTEM studies indicated that they have tetragonal structures with a = 3.843(1), c = 19.88(1) angstroms for n = 2 and a = 3.840(1), c = 26.17(1) angstroms for n = 3. The n = 2 phase showed a superconducting transition at 99 K, while the n = 3 one at 111 K.