Preferential growth mechanism of REBa2Cu3Oy (RE = Y, Nd) crystal on MgO substrate by liquid phase epitaxy

2001 ◽  
Vol 16 (4) ◽  
pp. 979-989 ◽  
Author(s):  
Katsumi Nomura ◽  
Saburo Hoshi ◽  
Xin Yao ◽  
Kazuomi Kakimoto ◽  
Yuichi Nakamura ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Growth Mechanism ◽  
Liquid Phase Epitaxy ◽  
Coulomb Force ◽  
Preferential Growth ◽  
Lattice Matching ◽  
Interfacial Energies ◽  
Calculation Results ◽  
The Difference ◽  
Good Agreement

Growth of the REBa2Cu3Oy (REBCO, RE = Y, Nd) crystals on the MgO substrates by the liquid phase epitaxy (LPE) process was investigated to clarify the growth mechanism. The crystal orientation of in-plane alignment was improved during the LPE process due to the preferential dissolution and growth even from a polycrystalline seed film. The orientation of preferential growth depended on the kind of RE for the REBCO system. The phenomena could be explained by the coarsening model by introducing the difference in the interfacial energies, which were considered not only general lattice matching but the Coulomb force at the interface between the REBCO and the MgO crystals. The preferential growth model was developed, and the calculation results showed a good agreement with the experimental results.

Growth Mechanism of RE-Ba-Cu-O Crystal by Liquid Phase Epitaxy Process

2000 ◽  
Vol 659 ◽  
Author(s):  
K. Nomura ◽  
S. Hoshi ◽  
X. Yao ◽  
Y. Nakamura ◽  
T. Izumi ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Growth Mechanism ◽  
Liquid Phase Epitaxy ◽  
Slope Angle ◽  
Slow Step ◽  
Initial Stage ◽  
The Difference ◽  
Mgo Surface ◽  
Mgo Substrate ◽  
Opposite Tendency

ABSTRACTGrowth of YBa2Cu3Oy (YBCO) crystals both on the MgO and the YBCO substrates has been investigated in order to clarify the growth mechanism of the liquid phase epitaxy (LPE) process for the coated conductor. It was found that the slope angle of the growth grain varied with growing in the initial stage of the LPE growth. In the case of the MgO substrate, the slope angle increased with laterally growing the crystal. On the other hand, the slope angle decreased with growing the crystal in the case of the YBCO substrate. This phenomenon with the opposite tendency could be explained by considering the difference in the step-advancing rates between on the MgO and the YBCO surfaces. It was found that the deep and steep valley of the LPE grains due to the slow step-advancing rate on the MgO is the origin of the flux trapping inclusions. It is necessary that the seed films should cover the entire MgO surface without undesired orientation grains and impurity particles in order to obtain the high quality LPE layer.

scholarly journals LPE Growth of Composite Thermoluminescent Detectors Based on the Lu3−xGdxAl5O12:Ce Single Crystalline Films and YAG:Ce Crystals

Crystals ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 189 ◽  
Author(s):  
Sandra Witkiewicz-Lukaszek ◽  
Anna Mrozik ◽  
Vitalii Gorbenko ◽  
Tetiana Zorenko ◽  
Pawel Bilski ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Liquid Phase Epitaxy ◽  
Single Crystalline ◽  
Epitaxial Structure ◽  
Simultaneous Registration ◽  
Crystalline Films ◽  
Ionization Radiation ◽  
Growth Method ◽  
The Difference ◽  
Thermoluminescent Detectors

This work is dedicated to the development of new types of composite thermoluminescent (TL) detectors for simultaneous registration of the different components of ionization radiation based on the single crystalline films (SCFs) of Ce3+-doped Lu3−xGdxAl5O12:Ce (x = 0–1.5) garnet and Y3Al5O12:Ce (YAG:Ce) substrates using the liquid phase epitaxy (LPE) growth method. For this purpose, the TL properties of the mentioned epitaxial structures were examined in Risø TL/OSL-DA-20 reader under excitation by α- and β-particles from 242Am and 90Sr-90Y sources. We have shown that the cation engineering of SCF content can result in more significant separation of the TL glow curves of SCFs and substrates under α- and β-particle excitations in comparison with the prototype of such composite detectors based on the Lu3Al5O12:Ce (LuAG:Ce)/YAG:Ce epitaxial structure. Specifically, the difference between the TL glow curves of Lu1.5Gd1.5Al5O12:Ce SCFs and YAG:Ce substrates increases up to 120 K in comparison with a respective value of 80 degrees in the prototype based on the LuAG:Ce/YAG:Ce epitaxial structure. Therefore, the LPE-grown epitaxial structures containing Lu1.5Gd1.5Al5O12:Ce SCFs and Ce3+-doped YAG:Ce substrate can be successfully applied for simultaneous registration of α- and β-particles in mixed fluxes of ionization radiation.

Initial Growth Mechanism of Sm1+xBa2-xCu3Oy Film Prepared by Liquid Phase Epitaxy

1999 ◽  
pp. 745-748
Author(s):  
Akemi Hayashi ◽  
Kazuomi Kakimoto ◽  
Yuichi Ishida ◽  
Teruo Izumi ◽  
Yuh Shiohara
Keyword(s):  
Liquid Phase ◽  
Growth Mechanism ◽  
Liquid Phase Epitaxy ◽  
Initial Growth

Growth mechanism of RE-Ba–Cu–O film on MgO substrate by liquid phase epitaxy

2001 ◽  
Vol 357-360 ◽  
pp. 1377-1381 ◽  
Author(s):  
K. Nomura ◽  
S. Hoshi ◽  
X. Yao ◽  
Y. Nakamura ◽  
T. Izumi ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Growth Mechanism ◽  
Liquid Phase Epitaxy ◽  
Mgo Substrate

MADELUNG ENERGY AND STABILITY OF ORDERED LATTICE IN A(B′B″)O3

1991 ◽  
Vol 05 (27) ◽  
pp. 1803-1807
Author(s):  
QIANG WANG ◽  
HAN RUSHAN ◽  
Z.Z. GAN
Keyword(s):  
Charge Distribution ◽  
Structural Stability ◽  
Ionic Crystal ◽  
Ordered Structure ◽  
Charge Distributions ◽  
Madelung Energy ◽  
Calculation Results ◽  
The Difference ◽  
Good Agreement

The Madelung energies of ionic crystal A(B′B″)O3 has been calculated for various B-site charge distributions, i.e., [Formula: see text], [Formula: see text] and [Formula: see text], and ordered superlattices, i.e., 1/2(111), 1/2(110) and 1/2(001). Calculation results show that the Madelung energy increases for a certain ordered structure as the difference in charge between B-site cations increases and demonstrate the experimental observations. Furthermore, the results point out that for a certain charge distribution the sequence of the structural stability is 1/2(001)<1/2(110)<1/2(111). This is in good agreement with experimental facts.

Interfacial structures of Y123 and Nd123 films formed on MgO(001) substrates by liquid phase epitaxy

2004 ◽  
Vol 19 (9) ◽  
pp. 2674-2682 ◽  
Author(s):  
J.S. Matsuda ◽  
F. Oba ◽  
T. Murata ◽  
T. Yamamoto ◽  
Y. Ikuhara ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Molecular Orbital ◽  
Liquid Phase Epitaxy ◽  
Molecular Orbital Calculations ◽  
Lattice Matching ◽  
Transmission Electron ◽  
Interfacial Structures ◽  
Chemical Factors ◽  
Geometrical Matching ◽  
Interfacial Free Energies

Interfacial structures of c-axis-oriented YBa2Cu3O7–y (Y123) and Nd1+xBa2–xCu3O7–y (Nd123) films were investigated by high-resolution transmission electron microscopy (HRTEM) in conjunction with geometrical lattice matching and molecular orbital calculations. These films were formed on MgO(001) substrates by liquid-phase epitaxy. Despite the similarity in lattice constants between Y123 and Nd123, the in-plane orientation relationship (OR) to the substrates is different: [100]film//[100]substrate(I) for Y123 and [110]film//[100]substrate(II) for Nd123. From the results of HRTEM observations and image simulations, it was found that the Y123 and Nd123 films are terminated by BaO and CuO-chain layers at the interfaces, respectively. For both the Y123/MgO and Nd123/MgO systems, the OR(I) is assessed to be the most favorable in point of geometrical matching and the OR(II) is the second among the rotational misorientations on the [001]film and [001]MgO. The molecular orbital calculations reveal that the interface with the OR(II) and the CuO-chain layer termination is preferable in terms of covalent bonding for both the systems. Consequently, we suggest that the preferential interfacial structures are delicately determined by a balance of the geometrical and chemical factors at the interfaces, resulting in making the lowest interfacial free energies.

Growth mechanism of thick c-axis oriented YBa2Cu3O7 − y films prepared by liquid phase epitaxy

1996 ◽  
Vol 158 (1-2) ◽  
pp. 61-67 ◽  
Author(s):  
T. Kitamura ◽  
S. Taniguchi ◽  
Y. Shiohara ◽  
I. Hirabayashi ◽  
S. Tanaka ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Growth Mechanism ◽  
Liquid Phase Epitaxy

Initial growth mechanism of a/b‐axis oriented YBa2Cu3O7−y film prepared by liquid phase epitaxy

1996 ◽  
Vol 68 (14) ◽  
pp. 2002-2004 ◽  
Author(s):  
Tasuku Kitamura ◽  
Izumi Hirabayashi ◽  
Shoji Tanaka ◽  
Yoshihro Sugawara ◽  
Yuichi Ikuhara
Keyword(s):  
Liquid Phase ◽  
Growth Mechanism ◽  
Liquid Phase Epitaxy ◽  
Initial Growth

The relationship between lattice matching and crosshatch in liquid phase epitaxy HgCdTe on CdZnTe substrates

1995 ◽  
Vol 24 (9) ◽  
pp. 1189-1199 ◽  
Author(s):  
S. P. Tobin ◽  
F. T. J. Smith ◽  
P. W. Norton ◽  
J. Wu ◽  
M. Dudley ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Liquid Phase Epitaxy ◽  
Lattice Matching ◽  
Cdznte Substrates ◽  
The Relationship
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