Molten salt synthesis of anisometric KSr2Nb5O15 particles

• Published in: Journal of crystal growth 2005-04, Vol.276 (3-4), p.446-452
• Main Authors: Zhao, Lili, Gao, Feng, Zhang, Changsong, Zhao, Ming, Tian, Changsheng
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Dielectric, piezoelectric, ferroelectric and antiferroelectric materials; Dielectrics, piezoelectrics, and ferroelectrics and their properties; Equations of state, phase equilibria, and phase transitions; Exact sciences and technology; General studies of phase transitions; Niobates, titanates, tantalates, pzt ceramics, etc; Nucleation; Physics
• ISSN: 0022-0248; 1873-5002
• DOI: 10.1016/j.jcrysgro.2004.11.388

Anisometric KSr2Nb5O15 (KSN) particles were synthesized in both the KCl-SrNb2O6 system (System I) and the KCl-SrCO3-Nb2O5 system (System II). Reaction mechanisms in the two systems are proposed, respectively. In System I, pure KSN particles could not be synthesized. KSN particles, which exhibited a stepwise morphology, were always contaminated by the impurity of Sr2Nb2O7. In contrast, pure KSN particles were successfully synthesized in System II by controlling the ratio of SrCO3/Nb2O5 and the amount of KCl salt, which had higher aspect ratio and were more uniform in size relative to those formed in System I. The pure KSN particles were of a perfect morphology and 10-40mum in lengthX1-2mum in diameter. The growth mechanism of KSN particles was interpreted as two-dimensional nucleation.