scholarly journals Crystal Growth with Oxygen Partial Pressure of the BaCuSi2O6 and Ba1–xSrxCuSi2O6 Spin Dimer Compounds

2016 ◽  
Vol 16 (6) ◽  
pp. 3416-3424 ◽  
Author(s):  
Natalija van Well ◽  
Pascal Puphal ◽  
Björn Wehinger ◽  
Mariusz Kubus ◽  
Jürg Schefer ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Spin Dimer

Single-crystal growth and characterization of the Pb0.5Sr2.5Y1−xCaxCu2Oy system

1995 ◽  
Vol 10 (9) ◽  
pp. 2211-2215 ◽  
Author(s):  
H. Jin ◽  
N.L. Wang ◽  
Y. Chong ◽  
M. Deng ◽  
L.Z. Cao ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Single Crystals ◽  
Single Crystal Growth ◽  
Optimum Conditions ◽  
Flux Method ◽  
Ca Doping ◽  
Spontaneous Nucleation

Two kinds of methods such as spontaneous nucleation from flux-free stoichiometric melt and CuO flux method have been used for the growth of Pb0.5Sr2.5Y1−xCaxCu2Oy single crystals. The morphologies, phases, and compositions occurring in the crystals grown from the two kinds of methods were compared systematically. Optimum conditions for the growth of larger 1212 phase single crystals are x =0.15, 0.25, and 0.35. The lattice parameters of the crystals with the 1212 phase were found to be increasing upon Ca doping. The resistivity behavior of the PbSrYCaCuO single crystals with the 1212 phase both in the state of as-grown and after extended annealings under various oxygen partial pressure was also discussed briefly.

Single Crystal Growth of YBa2Cu4O8 and Y2Ba4Cu7O15 Under High Oxygen Pressure

1991 ◽  
Vol 251 ◽  
Author(s):  
T. Miyatake ◽  
T. Takata ◽  
K. Yamaguchi ◽  
K. Takamuku ◽  
N. Koshizuka ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Single Crystal ◽  
Single Crystals ◽  
Oxygen Pressure ◽  
Maximum Size ◽  
Single Crystal Growth ◽  
Mixed Gas ◽  
High Oxygen Pressure

ABSTRACTWe investigate the crystal growth of YBa2Cu4O8 (124) and Y2Ba4Cu7O15 (247) in Al2O3 crucibles at an oxygen partial pressure of 20MPa employing an O2- HIP apparatus in a mixed gas environment of Ar-20%O2. Various melts compositions, rich in Ba and Cu, are explored to optimize crystal growth of 124. Large 124 single crystals up to a size of 1×0.5×0.05mm3 are obtained from compositions with about 65˜67%CuO. 247 single crystals having a maximum size of 3×1.5×0.05mm3 are grown from the same composition of melts. 124 crystals exhibit superconductivity at 75K. 247 crystals show Tc of 20K.

Crystal growth of SmBa2Cu3O7− under low oxygen partial pressure

1996 ◽  
Vol 166 (1-4) ◽  
pp. 859-862 ◽  
Author(s):  
Masaru Nakamura ◽  
Christian Krauns ◽  
Yasuji Yamada ◽  
Yuh Shiohara
Keyword(s):  
Crystal Growth ◽  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Low Oxygen

Thin film crystal growth of BaZrO3 at low oxygen partial pressure

2002 ◽  
Vol 243 (1) ◽  
pp. 164-169 ◽  
Author(s):  
Y Kitano ◽  
T Matsui ◽  
N Fujimura ◽  
K Morii ◽  
T Ito
Keyword(s):  
Thin Film ◽  
Crystal Growth ◽  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Low Oxygen

Influence of oxygen partial pressure on SrTiO3bulk crystal growth from non-stoichiometric melts

CrystEngComm ◽  
2015 ◽  
Vol 17 (17) ◽  
pp. 3224-3234 ◽  
Author(s):  
Christo Guguschev ◽  
Dirk J. Kok ◽  
Zbigniew Galazka ◽  
Detlef Klimm ◽  
Reinhard Uecker ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Oxygen Partial Pressure ◽  
Partial Pressure

Crystal growth of YBa2Cu3O7 by the SRL-CP method under low oxygen partial pressure atmosphere

1994 ◽  
Vol 9 (8) ◽  
pp. 1946-1951 ◽  
Author(s):  
M. Nakamura ◽  
Y. Yamada ◽  
Y. Shiohara
Keyword(s):  
Crystal Growth ◽  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Single Crystals ◽  
Oxygen Pressure ◽  
Crystal Surface ◽  
Nitrogen Atmosphere ◽  
Low Oxygen ◽  
Pure Nitrogen ◽  
Rich Liquid

Single crystals of YBa2Cu3O7−x (Y123) were grown by a modified top-seeded crystal pulling method using a BaO-CuO solution with the solid Y2BaCuO5 (Y211) as a solute in an yttria crucible [the so-called solute-rich liquid crystal pulling (SRL-CP) method] under 2% oxygen partial pressure atmosphere [P(O2) = 0.02 atm]. According to the pseudo-binary phase diagrams of Lee and Lee,1 the temperature of Y123 crystal growth was expected to be lower for 0.02 atm oxygen pressure than for 0.21 atm oxygen pressure. The single crystals grown under P(O2) = 0.02 atm and cooled under the same atmosphere after the separation of crystal from a solution had twins near the microcracks on the crystal surface. On the other hand, the single crystals grown under P(O2) = 0.02 atm and cooled under pure nitrogen atmosphere (6N) showed no twin structure. These results indicate that twins did not form during crystal growth but formed due to tetragonal-orthorhombic transition as a consequence of oxygenation at cooling under low oxygen partial pressure.

Metal Organic Deposition of REBa2Cu3O7-y Films from Metal Trifluoroacetate Precursors

2000 ◽  
Vol 659 ◽  
Author(s):  
Tetsuji Honjo ◽  
Hiroshi Fuji ◽  
Daxiang Huang ◽  
Yuichi Nakamura ◽  
Teruo Izumi ◽  
...  
Keyword(s):  
Thin Films ◽  
Growth Rate ◽  
Crystal Growth ◽  
Substrate Temperature ◽  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Experimental Results ◽  
Experimental Conditions ◽  
Metal Organic ◽  
Metal Organic Deposition

ABSTRACTMetal organic deposition (MOD) process using metal trifluoroacetate (TFA) precursors was applied to the Nd1+XBa2−XCu3Oy (Nd123) and the Tc dependence on experimental conditions such as the oxygen partial pressure (PO2) and the substrate temperature (Ts) for annealing was investigated. Thin films grown on SrTiO3 substrates at Ts = 800°C under PO2 = 300 ppm showed a Tc value of 89 K. However, from the results of TEM-EDS measurements, the substitution values of x in the Nd123 films increased from the substrate toward the surface in the film. These experimental results could be thermodynamically explained by the following model. The basic idea of the model is that the Ba potential in the precursor decreases by coarsening of BaF2 particles during the annealing for the Nd123 crystal growth. This model predicts that the small substitution value can be obtained with a higher growth rate of the Nd123 phase under low PO2.

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