The influence of growth rate on the microstructural and magnetic properties of float-zone grown crystals

2007 ◽  
Vol 309 (1) ◽  
pp. 119-125 ◽  
Author(s):  
S.M. Koohpayeh ◽  
J.S. Abell ◽  
K.K. Bamzai ◽  
A.I. Bevan ◽  
D. Fort ◽  
...  
Keyword(s):  
Growth Rate ◽  
Magnetic Properties ◽  
Float Zone

MAGNETIC PROPERTIES OF La-DOPED AND Cu-DOPED ZnO NANOWIRES FABRICATED BY HYDROTHERMAL METHOD

2013 ◽  
Vol 27 (15) ◽  
pp. 1362006 ◽  
Author(s):  
SAN-LIN YOUNG ◽  
HONE-ZERN CHEN ◽  
MING-CHENG KAO ◽  
CHUNG-YUAN KUNG ◽  
CHEN-CHENG LIN ◽  
...  
Keyword(s):  
Growth Rate ◽  
Magnetic Properties ◽  
Room Temperature Ferromagnetism ◽  
Substitution Effect ◽  
Hexagonal Structure ◽  
Zno Nanowires ◽  
Cu Doping ◽  
La Doping ◽  
Doped Zno ◽  
La Doped

La -doped and Cu -doped ZnO nanowires have been prepared to compare the substitution effect on the microstructural and magnetic properties. The XRD patterns of both compositions with single diffraction peak (002) show the same wurtzite hexagonal structure. The growth rate of the ZnO nanowires were enhanced by Cu doping, which were different from the suppression of growth rate by La doping. Room temperature ferromagnetism is observed for all ZnO , Cu -doped ZnO and La -doped ZnO nanowires. The saturation magnetizations are 0.102, 0.232 and 0.04 emu/g for ZnO , Cu -doped ZnO and La -doped ZnO nanowires, respectively. The results showed that the ferromagnetism is restrained by Cu doping, but enhanced by the La doping.

Influence of growth rate on the structure and composition of float zone grown Bi2Sr2CaCu2O8 superconducting fibers

1989 ◽  
Vol 98 (3) ◽  
pp. 545-549 ◽  
Author(s):  
D. Gazit ◽  
P.N. Peszkin ◽  
L.V. Moulton ◽  
R.S. Feigelson
Keyword(s):  
Growth Rate ◽  
Float Zone

Growth rate dependence of the NdFeO3 single crystal grown by float-zone technique

2011 ◽  
Vol 318 (1) ◽  
pp. 927-931 ◽  
Author(s):  
Yabin Wang ◽  
Shixun Cao ◽  
Mingjie Shao ◽  
Shujuan Yuan ◽  
Baojuan Kang ◽  
...  
Keyword(s):  
Growth Rate ◽  
Single Crystal ◽  
Rate Dependence ◽  
Float Zone

Influence of growth parameters on the microstructure of directionally solidified Bi2Sr2CaCu2Oy

1990 ◽  
Vol 5 (9) ◽  
pp. 1834-1849 ◽  
Author(s):  
M. J. Cima ◽  
X. P. Jiang ◽  
H. M. Chow ◽  
J. S. Haggerty ◽  
M. C. Flemings ◽  
...  
Keyword(s):  
Growth Rate ◽  
Directional Solidification ◽  
Growth Rates ◽  
Growth Parameters ◽  
Directionally Solidified ◽  
Primary Solidification Phase ◽  
Float Zone ◽  
The Matrix ◽  
Laser Heated ◽  
Planar Growth

Laser-heated float zone growth was used to study the directional solidification behavior of Bi–Sr–Ca–Cu–O superconductors. The phases that solidify from the melt, their morphology, and their composition are altered by growth rate. Highly textured microstructures are achieved by directional solidification at all growth rates. The superconducting phase is found always to have the composition Bi2.5Sr2CaCu2.2Oy when grown from boules with composition 2:2:1:2 (BiO1.5:SrO:CaO:CuO). Planar growth fronts of Bi2.5Sr2CaCu2.2Oy are observed when the temperature gradient divided by the growth rate (G/R) is larger than 3 ⊠ 1011 K-s/m2 in 2.75 atm oxygen. Thus, the 2212 compound was observed to solidify directly from the melt at the slowest growth rates used in this study. Measurement of the steady-state liquid zone composition indicates that it becomes bismuth-rich as the growth rate decreases. Dendrites of the primary solidification phase, (Sr1−xCax)14Cu24Oy, form in a matrix of Bi2.5Sr2CaCu2.2Oy when G/R is somewhat less than 3 ⊠ 1011 K-s/m2. Observed microstructures are consistent with a peritectic relationship among Bi2.5Sr2CaCu2.2Oy, (Sr1−xCax)14Cu24Oy (x = 0.4), and a liquid rich in bismuth at elevated oxygen pressure. At lower values of G/R, Sr3Ca2Cu5Oy is the primary solidification phase and negligible Bi2.5Sr2CaCu2.2Oy forms in the matrix.

Effect of growth rate on the magnetic properties of FeAl multilayers

1992 ◽  
Vol 104-107 ◽  
pp. 1767-1768 ◽  
Author(s):  
P. Allia ◽  
C. Beatrice ◽  
E. Bonetti ◽  
G. Sberveglieri ◽  
G. Valdré ◽  
...  
Keyword(s):  
Growth Rate ◽  
Magnetic Properties

Growth rate dependence of the extrinsic magnetic properties of electrodeposited CoPt films

2010 ◽  
Vol 322 (9-12) ◽  
pp. 1576-1580 ◽  
Author(s):  
M. Ghidini ◽  
A. Lodi-Rizzini ◽  
C. Pernechele ◽  
M. Solzi ◽  
R. Pellicelli ◽  
...  
Keyword(s):  
Growth Rate ◽  
Magnetic Properties ◽  
Rate Dependence

Phase Chemistry and Micro‐Structure of Directionally Solidified Bi2Sr2CaCu2O8

1989 ◽  
Vol 169 ◽  
Author(s):  
H.M. Chow ◽  
X.P. Jiang ◽  
M.J. Cima ◽  
J.S. Haggerty ◽  
H.D. Brody ◽  
...  
Keyword(s):  
Growth Rate ◽  
Growth Rates ◽  
Dendritic Growth ◽  
Slow Growth ◽  
Directionally Solidified ◽  
Float Zone ◽  
Pole Figures ◽  
Rich Liquid ◽  
Phase Chemistry ◽  
Laser Heated

AbstractCeramic rods of Bi2Sr2CaCu2O8 (2212) were directionally solidified by laser‐heated float‐zone crystal growth [1]. The microstructure of the resulting material can be controlled through variation of growth rate. The 2212 phase is Sr‐deficient, having an actual composition Bi2.5Sr2CaCu2.2Oy. At slow growth rates (0.2 cm/h), plane front growth produced highly textured samples of almost phase pure 2212, and pole figures show that the solidification front proceeds along the (200) axis of the 2212 grains. Faster growth rates produced dendritic growth and polyphase microstructures. At the fastest growth rate studied (16 cm/h), no 2212 phase was observed. Observations indicate that Bi2.5Sr2CaCu2.2Oy melts peritectically into (Sr1‐x.Cax.)14Cu24Oy and a Bi‐rich liquid.

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