Czochralski growth and structural investigations of La1-xNdxGaO3 solid solution single crystals

Citation
M. Berkowski et al., Czochralski growth and structural investigations of La1-xNdxGaO3 solid solution single crystals, J CRYST GR, 209(1), 2000, pp. 75-80
Citations number
15
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
JOURNAL OF CRYSTAL GROWTH
ISSN journal
00220248 → ACNP
Volume
209
Issue
1
Year of publication
2000
Pages
75 - 80
Database
ISI
SICI code
0022-0248(200001)209:1<75:CGASIO>2.0.ZU;2-G
Abstract
Growth of single crystals in the pseudobinary LaGaO3-NdGaO3 system by the C zochralski method was investigated. It was found that solid solution crysta ls La1 - xNdxGaO3 exist in the whole concentration range. The structure of the crystals was investigated by X-ray diffraction method. It was found tha t the unit cell volume decreases linearly with increasing Nd concentration in agreement with Vegard's law, With increasing Nd concentration x the latt ice parameters a and c decrease, whereas b increases. At x = 0.32 parameter s a and b become equal and the crystal adopts the pseudo-tetragonal structu re, The differential thermal analysis proved that the temperature of the fi rst-order phase transition observed in LaGaO3 at 150 degrees C rises linear ly with Nd concentration at the rate of 20.5 degrees C/Nd mol% up to the me lting temperature. The segregation coefficients of Nd in LaGaO3 and La in N dGaO3 have been found to be k(eff)(Nd) approximate to 0.77 and k(eff)(La) a pproximate to 1.3. (C) 2000 Published by Elsevier Science B.V. All rights r eserved. PACS. 81.10. - h; 81.10.Fq; 68.35.Bs.