Title :
Mercury superconductors crystal growth under high pressure and high temperature influenced by crucible composition
Author :
Morawski, A. ; Paszewin, A. ; Lada, T. ; Marciniak, H. ; Przybylski, K. ; Szymczak, H. ; Wisniewski, A.
Author_Institution :
High Pressure Res. Center, Polish Acad. of Sci., Warsaw, Poland
fDate :
6/1/1997 12:00:00 AM
Abstract :
We report investigations on chemical reactions among flux containing Hg, Ba, Ca, Cu, O and crucibles made of Al/sub 2/O/sub 3/, Y/sub 2/O/sub 3/ and BaZrO/sub 3/. Our research work on oxide superconductors containing mercury allowed us to compose the first approach of p-T-x conditions of synthesis. We obtain quite large (up to 2/spl times/2 mm/sup 2/), flat single crystals. We present the results of our investigation of the influence of p-T-x conditions on reactions between the batch and the various crucibles. XRD patterns and morphology study by SEM and EDX analysis are shown. We conclude that the BaZrO/sub 3/ crucible is the most neutral for the crystallization process.
Keywords :
X-ray chemical analysis; X-ray diffraction; barium compounds; calcium compounds; crystal growth from melt; high-temperature superconductors; mercury compounds; scanning electron microscopy; Al/sub 2/O/sub 3/; Al/sub 2/O/sub 3/ crucible; BaZrO/sub 3/; BaZrO/sub 3/ crucible; EDX analysis; Hg-Ba-Ca-Cu-O; Hg-based oxide superconductors; SEM; XRD patterns; Y/sub 2/O/sub 3/; Y/sub 2/O/sub 3/ crucible; chemical reactions; crucible composition; crystal growth; high pressure high temperature conditions; large flat single crystals; melt flux reactions; morphology; p-T-x conditions; Chemicals; Crystalline materials; Crystallization; High temperature superconductors; Mercury (metals); Solid state circuits; Superconducting materials; Superconductivity; X-ray scattering; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
