Primary crystallization field and crystal growth of Bi2Sr2CaCu2O

1996 ◽  
Vol 166 (1-4) ◽  
pp. 867-871 ◽  
Author(s):  
Yu Huang ◽  
Mei-Hui Huang ◽  
Ming Jian
Keyword(s):  
Crystal Growth ◽  
Primary Crystallization ◽  
Crystallization Field ◽  
Primary Crystallization Field

Effect of Ag on the primary phase field of the high-Tc (Bi,Pb)-2223 superconductor

2000 ◽  
Vol 15 (2) ◽  
pp. 296-305 ◽  
Author(s):  
W. Wong-Ng ◽  
L. P. Cook ◽  
W. Greenwood ◽  
A. Kearsley
Keyword(s):  
Phase Field ◽  
Volume Fraction ◽  
Primary Crystallization ◽  
Primary Phase ◽  
Crystallization Field ◽  
Primary Phase Field ◽  
Liquidus Data ◽  
Primary Crystallization Field ◽  
High Tc ◽  
Melt Composition

The subsolidus equilibria and the primary phase field (crystallization field) of the 110 K high-Tc (Bi,Pb)-2223 ([Bi,Pb]:Sr:Ca:Cu) phase have been determined in the presence of Ag under a 92.5% Ar/7.5% O2 atmosphere (volume fraction). A total of 29 six-phase volumes that include both the (Bi,Pb)-2223 and Ag phases was observed. These subsolidus volumes are similar to those observed without the presence of Ag. The compositional range of initial melts of these volumes (mole fraction basis) covers BiO1.5 from 5.6% to 25.3%, PbO from 0.4% to 13.8%, SrO from 8.4% to 31.9%, CaO from 12.2% to 33.3%, CuO from 21.7% to 40.9%, and AgO0.5 from 1.2% to 6.3%. Based on these data, the primary crystallization field for the (Bi,Pb)-2223 phase in the presence of Ag was constructed using the convex hull technique. A section through this “volume” was portrayed by holding the AgO0.5, SrO, and CaO components at the median value of the 29 compositions while allowing projection on the other three axes (BiO1.5, PbO, and CuO). The net effect of Ag on the melt composition is a reduction in the PbO concentration and an increase in the SrO content. Applications of the liquidus data are also discussed.

The primary crystallization field and growth of Bi-2212 crystals in platinum and gold crucibles

2001 ◽  
Vol 231 (1-2) ◽  
pp. 194-202 ◽  
Author(s):  
A.B. Kulakov ◽  
I.G. Naumenko ◽  
S.A. Zver’kov ◽  
A.V. Kosenko ◽  
S.S. Khasanov ◽  
...  
Keyword(s):  
Primary Crystallization ◽  
Crystallization Field ◽  
Primary Crystallization Field

X-Ray Characterization of Phase Equilibria of the Raveau and 2212 Phases in the Bi-Sr-Ca-Cu-0 System

1995 ◽  
Vol 39 ◽  
pp. 731-738
Author(s):  
Winnie Wong-Ng ◽  
Lawrence P. Cook ◽  
F. Jiang
Keyword(s):  
Solid Solution ◽  
Phase Equilibria ◽  
Powder Diffraction ◽  
Primary Crystallization ◽  
Primary Crystallization Field ◽  
X Ray ◽  
Solid Solution Region ◽  
Ca Substitution ◽  
Solution Region

Phase equilibria of two superconductor phases, namely the 20K Raveau phase (Bi2.2-xSr1.8+xCuOz, currently referred to as the 11905 phase) and the 80K 2212 phase of the Bi-Sr-Ca-Cu-0 system were investigated. The amount of Ca-substitution of the Raveau solid solution was determined and the solid solution region can be approximately described as Bi2.2+xSr1.8-X-Y CayCu1±x/2Ow (referred to as the Ca-Raveau phase or the 119x5, ‘ with 0<x<0.15, 0<y<0.5. To determine the melting equilibria of the 2212 phase, a procedure involving the use of a wicking technique to capture the melt was applied. X-ray powder diffraction (XPD) and quantitative energy dispersive x-ray spectroscopy (EDS) were used to analyse the phases present in the residual and melt, respectively. The approximate primary crystallization field of the incongruently melting 2212 phase was illustrated.

Primary Crystallization Region of NaAl(MoO4)2,Cr3+Doping, Crystal Growth, and Characterization

2006 ◽  
Vol 18 (2) ◽  
pp. 442-448 ◽  
Author(s):  
A. Peña ◽  
R. Solé, ◽  
Jna. Gavaldà ◽  
J. Massons ◽  
F. Díaz ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Primary Crystallization ◽  
Crystallization Region

scholarly journals Preparation of glass-ceramic in Li2O-Al2O3-GeO2-P2O5 system

2013 ◽  
Vol 7 (4) ◽  
pp. 147-151 ◽  
Author(s):  
Jelena Nikolic ◽  
Sonja Smiljanjic ◽  
Srdjan Matijasevic ◽  
Vladimir Zivanovic ◽  
Mihajlo Tosic ◽  
...  
Keyword(s):  
Activation Energy ◽  
Crystal Growth ◽  
Homogeneous Nucleation ◽  
Crystallization Process ◽  
Glass Ceramics ◽  
Primary Crystallization ◽  
Primary Phase ◽  
Crystallization Conditions ◽  
P2o5 System

The results of preparation and structural characterization of glass-ceramics from the system Li2O-Al2O3-GeO2-P2O5 are shown in this paper. The crystallization behaviour of the selected glass was examined under non-isothermal and isothermal crystallization conditions. DTA, XRD and SEM methods were employed for analyses. It was confirmed that this glass crystallizes by the volume crystallization mechanism. The results also showed that the glass crystallize by primary crystallization. As a primary phase the LiGe2(PO4)3 is formed and the traces of GeO2 as a secondary one is present. The crystallization process occurred at a high homogeneous nucleation rate and the spherical morphology of crystal growth. By applying the Kissinger relation the activation energy of crystal growth Ea = 462 kJ/mol was determined.

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