Accession Number:
ADP011872
Title:
Growth and Structure of Strontium Doped LaGaO3
Descriptive Note:
Conference proceedings
Corporate Author:
POLISH ACADEMY OF SCIENCES WARSAW INSTOF PHYSICS
Personal Author(s):
Report Date:
2001-01-01
Pagination or Media Count:
5.0
Abstract:
A series of La1-xSrxGaO3 solid solution single crystals with x 0, 0.04 and 0.12 were grown by the Czochralski method and with x 0.01, 0.06 and 0.1 by the floating zone method. The segregation coefficient of Sr in LaGaO3 has been found to be ksub eff Sr 1.25 - 0.01. The crystals were grown from the melt with stoichiometric Ga2O3 amount at a growth rate ranging from 2.5 mmh for pure LaGaO3 to 1.2 mmh for La0.88Sr0.12GaO3. The structure of these crystals was investigated by X-ray powder diffraction technique using CuKsub alpha radiation. The diffraction patterns were analyzed by Rietveld refinement method. Crystals with strontium concentrations from x 0 to 0.1 crystallizes adopting Pbnm structure. It was found that deviation from the ideal perovskite structure decreases with rising strontium concentration, finally reaching centrosymmetric Ibmm structure at x 0.12. Orthorombic unit cell parameters c and b decreases whereas a increases with x. Thermal analysis proved that the temperature of the first order phase transition observed in pure LaGaO3 at 150 deg C falls to 126 deg C at x 0.01 and remains almost constant at higher x.
Descriptors:
- *DOPING
- *CRYSTAL GROWTH
- *STRONTIUM COMPOUNDS
- *LANTHANUM COMPOUNDS
- *GALLATES
- SYMPOSIA
- PHASE TRANSFORMATIONS
- THIN FILMS
- SINGLE CRYSTALS
- EPITAXIAL GROWTH
- THERMAL ANALYSIS
- SEGREGATION(METALLURGY)
- COEFFICIENTS
- HIGH TEMPERATURE SUPERCONDUCTORS
- RARE EARTH COMPOUNDS
- REFINING
- SOLID SOLUTIONS
- POLAND
- PEROVSKITES
- CZOCHRALSKI CRYSTALS
Subject Categories:
- Inorganic Chemistry
- Crystallography