NaOH solution hydrothermal growth and superconducting properties of BaPb 1- xBi xO 3 single crystals
Abstract
BaPb 1- xBi xO 3 (BPB) single crystals were grown hydrothermally in a NaOH hydrothermal solution, in which the chemical composition of the grown crystals could be easily controlled over the range 0 ⩽ × ⩽ 1. the solibility increased with dissolution temperature and solvent concentration. The dissolution reaction obeyed Van't Hoff's law, indicating participation of hydroxide ions. The dissolution enthalphy was about 55 kJ/mol. single crystals 5×5×4 mm 3 in size could be grown in Au capsules of 9.7 mm inner diameter at 100 MPa and 400°C. Single crystals of BaPb 0.75Bi 0.25O 3 showed a sharp superconducting transition at 11.7 K with a ▿ T of 1.6 K. The crystal structure was confirmed by X-ray crystallographic experiments to be tetragonal with a superlattice structure. The superconductivity of BPB may be responsible for the superlattice structure.
- Publication:
-
Journal of Crystal Growth
- Pub Date:
- December 1987
- DOI:
- 10.1016/0022-0248(87)90030-3
- Bibcode:
- 1987JCrGr..85..602H
- Keywords:
-
- Crystal Structure;
- Hydrothermal Crystal Growth;
- Mixed Oxides;
- Single Crystals;
- Sodium Hydroxides;
- Superconductivity;
- Barium Oxides;
- Bismuth Oxides;
- Lead Oxides;
- Transition Temperature;
- Solid-State Physics