Crystal Structure Variations due to Multiplicity in CuO2-Ca-CuO2 Slabs in Superconductive Tl-Ba-Ca-Cu-O Oxides
Abstract
Structural variations in crystals for Tl-Ba-Ca-Cu-O oxides with Tc above 100 K were examined by an electron microscope. Common phases for these oxides were found to be Tl2Ba2CaCu2O8+x and Tl2Ba2Ca2Cu3O10+x. Variations in these structures result from multiplicity in (CuO2-Ca-CuO2)× n slab (designated CCn with n{=}integer), whose composition is represented by Tl2Ba2CanCun+1O2(3+n)+x. It is shown, for the first time, that slab thicknesses CCn have been observed for structures with n{=}1 to 6. The structural variation is also caused by two kinds of BaO-TlO-BaO and BaO-TlO-TlO-BaO slabs.
- Publication:
-
Japanese Journal of Applied Physics
- Pub Date:
- May 1988
- DOI:
- 10.1143/JJAP.27.L837
- Bibcode:
- 1988JaJAP..27L.837I
- Keywords:
-
- Barium Compounds;
- Copper Oxides;
- Crystal Structure;
- High Temperature Superconductors;
- Mixed Oxides;
- Thallium Compounds;
- Calcium Compounds;
- Chemical Composition;
- Critical Temperature;
- Electron Microscopy;
- Solid-State Physics