Phase Diagrams in the Solid Solution Nd–Ba–Cu–O System and NdBa2Cu3O7-δ Single Crystals Growth by the Traveling-Solvent Floating-Zone Method

Autor:	Kiyoshi Kuroda, Hiromi Unoki, Souichi Segawa, Naoki Koshizuka, Jun–ichi Okano, In–Hwan Choi, Keita Abe, Kazuhisa Itoi
Rok vydání:	1997
Předmět:	Crystal Quenching Chemistry General Engineering Analytical chemistry General Physics and Astronomy Mineralogy Liquidus Single crystal Powder diffraction Line (formation) Phase diagram Solid solution
Zdroj:	Japanese Journal of Applied Physics. 36:6730
ISSN:	1347-4065 0021-4922
DOI:	10.1143/jjap.36.6730
Popis:	We have investigated the pseudo-binary phase diagrams between NdBa2Cu3O7-δ (Nd123) and several Ba–Cu–O compositions in air and reduced oxygen atmosphere by DTA, quenching, and X-ray powder diffraction measurements. We found that in air the wider liquidus line exists in the 60–90% concentration of (1/13) Ba3Cu10O13 [40–10% (1/6) Nd123] at 940–1090° C. Under 0.1% O2 in Ar, the liquidus line on the same pseudo-binary line shifts to the 65–92.5% concentration of (1/13) Ba3Cu10O13 [35–7.5% (1/6) Nd123] at 850–1000° C. Furthermore, we tried to grow single crystals of Nd123 based on these phase diagrams by traveling-solvent floating-zone method under 0.1% O2 in Ar. We could get a single crystal rod having the composition of Nd1.02Ba1.98Cu3O7-δ and the T C∼93 K in all through the length of the crystal rod.
Databáze:	OpenAIRE
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