Pinning properties of quenched and melt growth method-YBCO bulk samples

The ultrasonic velocity measurements of a Y-Ba-Cu-O material, prepared by Melt-Powder-Melt-Growth process (MPMG) with Nd-123 as a seed material, known as MPMG-II material, have been undertaken by the pulse transmission technique over a temperature range 80–300 K. It has been observed that the MPMG-II material, in contrast to Y-123 material also prepared by the Melt-Powder-Melt-Growth method without using any seed material, designated as MPMG-II, exhibits a very high Young's and rigidity modului, which are comparable with those of single crystalline ones. Further, it has also been observed that the longitudinal velocity is found to increase continuously with decreasing temperature right up to liquid nitrogen temperature, i.e. 80 K, without showing any anomaly, whatsoever, thereby indicating that the behavior resembles a normal solid having normal behavior. From these two observations, it has been speculated that MPMG-II material may be free from all types of lattice instabilities and that it may be approaching mechanically a single crystalline Y-123 material.

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YBCO Bulk Superconductors Prepared by Solid-liquid Melt Growth

Journal of the Korean Institute of Electrical and Electronic Material Engineers ◽

10.4313/jkem.2009.22.10.860 ◽

2009 ◽

Vol 22 (10) ◽

pp. 860-863

Author(s):

Sang-Chul Han ◽

Jeong-Phil Lee ◽

Byeong-Cheol Park ◽

Neyon-Ho Jeong ◽

Byung-Jun Park ◽

...

Keyword(s):

Ybco Bulk ◽

Melt Growth ◽

Bulk Superconductors ◽

Solid Liquid

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Microstructure of NdBaCuO superconductors prepared by the oxygen-controlled-melt-growth method

Physica C Superconductivity ◽

10.1016/s0921-4534(96)00710-1 ◽

1997 ◽

Vol 276 (3-4) ◽

pp. 185-196 ◽

Cited By ~ 15

Author(s):

P. Diko ◽

H. Kojo ◽

M. Murakami

Keyword(s):

Melt Growth ◽

Growth Method

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Convenient Melt-Growth Method for Thermoelectric Mg2Si

Journal of Electronic Materials ◽

10.1007/s11664-014-3014-8 ◽

2014 ◽

Vol 43 (6) ◽

pp. 2212-2217 ◽

Cited By ~ 16

Author(s):

K. Kambe ◽

H. Udono

Keyword(s):

Melt Growth ◽

Growth Method

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Optical Characterization of ZnO Materials Grown by Modified Melt Growth Technique

Materials Science Forum ◽

10.4028/www.scientific.net/msf.527-529.1567 ◽

2006 ◽

Vol 527-529 ◽

pp. 1567-1570 ◽

Cited By ~ 2

Author(s):

Zhe Chuan Feng ◽

J.W. Yu ◽

J.B. Wang ◽

R. Varatharajan ◽

B. Nemeth ◽

...

Keyword(s):

Energy Gap ◽

Small Degree ◽

Electronic Energy ◽

Bulk Materials ◽

Growth Technique ◽

Melt Growth ◽

Growth Method ◽

Uv Visible ◽

Co Doped

ZnO bulk crystal wafers, undoped and doped with various impurities of Ga, Er, Co, Ho, Fe, Mn, and co-doped Mg-Li, have been prepared by a modified melt growth method, and characterized by optical techniques of Raman scattering, photoluminescence and UV-visible transmission. Their wurtzite structures were confirmed, with a small degree of crystalline imperfection. It is shown that with some dopants, such as, Co and Fe, the electronic energy gap is affected much less than the optical absorption gap. Computer analysis has helped greatly in obtaining useful information of the optical properties of the ZnO bulk materials.

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