Browse > Article
http://dx.doi.org/10.4313/JKEM.2003.16.12S.1278

Phase Transformation and Misconstruct of REBa2Cu3O7-x (RE=Nd, Gd, Dy) Superconductor during Heat treatment  

오용택 (조선대학교 에너지자원신기술연구소)
한용희 (한국전력공사 인천지사)
한병성 (전북대학교 전자정보공학부)
한상철 (한전전력연구원 신에너지 그룹)
성태현 (한전전력연구원 신에너지 그룹)
홍광준 (조선대학교 물리화학부)
신동찬 (조선대학교 신소재공학과)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.16, no.12S, 2003 , pp. 1278-1285 More about this Journal
Abstract
This study investigated the phase transformation of the REBa$_2$Cu$_3$$O_{7-x}$ (RE=Nd, Gd, Dy) superconductor, and CCT (Continuous-Cooling-Transformation) along with the TTT (Time-Temperature-Transformation) diagrams are suggested according to the isothermal and continuous cooling heat-treatments. The peritectic temperature of the 123 phases decreased approximately 3$0^{\circ}C$ when the ionic radius of the rare-earth elements was reduced. The optimum cooling rate where BC and Cu-free phases do not exist was 0.001$^{\circ}C$/s. At this cooling late, the 123 phase grew with a c-axis Perpendicular to the surface and had a well-distributed 211 phase. When the oxygen partial pressure was reduced Outing isothermal heat-treatment, the formation temperature of the 211 phase decreased. In addition, the formation temperature of the 123 phases decreased from 100$0^{\circ}C$ (Nd-123) to 9$25^{\circ}C$ (Gd-123), and finally 875$^{\circ}C$ (Dy-123) according to the decrease in the ionic radius of the tare-earth elements. Compared to Nd-123, Gd- and Dy-123 had a better texture with a well-distributed 211 phase.e.
Keywords
$REBa_{2}Cu_{3}O_{7-x}$(RE=Nd, Gd, Dy) superconductor; Second phases; CCT; TTT diagram;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 Quasi-binary phase diagram of <TEX>$Nd_4\;Ba_2\;Cu_2\;O_{10}-Ba_3\;Cu_5\;O_8$</TEX> system /
[ M.Kambara;M.Nakamura;Y.Shiohara;T.Umeda ] / Physica C   DOI   ScienceOn
2 Flux pinning in melt-grown NdBa₂Cu₃Oy Superconductors /
[ M.Murakami;S.I.Yoo;T.Higuchi;N.Sakai;J.Weltz;N.Koshizuka:S.Tanaka ] / Jpn. J. Appl. Phys.   DOI   ScienceOn
3 Oxygen partial pressure dependence of the yttrium solubility in Y-Ba-Cu-O solution /
[ M.Nakanura;C.Krauns;Y.Shiohara ] / J. Mater. Res.   DOI   ScienceOn
4 Heat treatment condition for preparing <TEX>$Nd_{1+x}\;Ba_2 xCu_3\;O_7$</TEX>d superconductors /
[ Z.Fan;D.Soh;P.Si;Y.Li;B.Lim ] / Proc. 2001 Summer Conf. KIEEME
5 Fabrication and characterization of <TEX>$LRE_{1+x}Ba_{2 x}\;Cu_3\;O_y$</TEX> (LRE:Nd, Eu, Gd, NEG) superconductors: a low oxygen partial pressure /
[ M.Muralidhar;N.Sakai;M.Jirsa;M.Murakami ] / Physica C   DOI   ScienceOn
6 <TEX>$Bi_2\;Sr_2\;Ca_{2.2}\;Cu_3\;O_x$</TEX> 계에서 초전도상과 Bi-free상의 핵생성과 성장 /
[ 오용택;신동찬;구재본;이인환;한상철;성태현 ] / 전기전자재료학회논문지   과학기술학회마을
7 High critical-current density of NdBa₂Cu₃<TEX>$O_7$</TEX> ð single crystals /
[ T.Egi;J.G.Wen;K.Kuroda;H.Unoki;N.Koshizuka ] / Appl. Phys. Lett.   DOI   ScienceOn
8 Modified melt crystallization processes for improved RE-123 based bulk materials (RE=Y, Nd) /
[ G.Krabbes;P.Schatzle;W.Bieger;G.Fuchs ] / Appl. Supercond.   DOI   ScienceOn
9 A new type of pinning center in melt grown Nd123 and Sm123 /
[ M.Murakami;S.I.Yoo;T.Higuchi;N.Sakai;M.Watahiki;N.Koshizuka;S.Tanaka ] / Physica C   DOI   ScienceOn
10 Melt processing for obtaining NdBa₂Cu₃Oy superconductors with high Tc and large Jc /
[ S.I.Yoo;N.Sakai;T.Higuchi;M.Murakami ] / Appl. Phys. Lett.   DOI   ScienceOn
11 Enhanced Tc and strong flux pinning in melt-processed NdBa₂Cu₃Oy superconductors /
[ S.I.Yoo;M.Murakami;N.Sakai;T.Higuchi;S.Tanaka ] / Jpn. J. Appl. Phys.   DOI   ScienceOn
12 Fabrication of multi-filamentary LRE123 superconductors /
[ T.Goto;Y.Adachi;Y.Bito;K.Watannabe ] / Physica C   DOI   ScienceOn
13 Superconducting properties of (Nd, Eu, Gd)-123;2431, 2000.partial pressure /
[ M.Muralidhar;M.Murakami ] / Physica C
14 Effect of oxygen partial pressure on the neodymium solubility in Ba-Cu-O solvent /
[ M.Nakamura;M.Kambara;T.Umeda;Y.Shiohara ] / Physica C   DOI   ScienceOn
15 Fabrication of NdBa₂Cu₃<TEX>$O_7\;ð$</TEX> single crystals by the top-seeded solution-growth method in 1%, 21%, and 100% oxygen partial pressure atmosphere /
[ M.Nakamura;H.Kutami;Y.Shiohara ] / Physica C   DOI   ScienceOn
16 Preparation of zone-meltinged NdBaCuO under low oxygen pressure /
[ D.Soh;Z.Fan;H.Kim;W.Gao;T.Kim ] / Proc. 2001 Autumm Conf. KIEEME