Synthesis and crystallization mechanism of europium-titanate Eu2Ti2O7

0428391 - ÚFE 2015 RIV NL eng J - Journal Article
Mrázek, Jan - Surýnek, Martin - Bakardjieva, Snejana - Buršík, Jiří - Kašík, Ivan
Synthesis and crystallization mechanism of europium-titanate Eu2Ti2O7.
Journal of Crystal Growth. -, č. 391 (2014), s. 25-32. ISSN 0022-0248. E-ISSN 1873-5002
R&D Projects: GA ČR GAP102/10/2139
Institutional support: RVO:67985882 ; RVO:61388980 ; RVO:68081723
Keywords : Nucleation * Nanomaterials * Sol–gel
Subject RIV: JA - Electronics ; Optoelectronics, Electrical Engineering; CA - Inorganic Chemistry (UACH-T); BJ - Thermodynamics (UFM-A)
Impact factor: 1.698, year: 2014

The synthesis of nanocrystalline europium-titanate pyrochlore Eu2Ti2O7 by a generic sol gel approach is presented. The size of the formed nanocrystals was tailored from 20 nm to 100 nm. The nucleation process and the crystallization mechanism were studied. The activation energies of the crystallization process and crystal growth were calculated. It was found; from the calculated Avrami0s parameters; that the crystallization process starts by homogenous nucleation followed by three dimensional growth. The activation energies of the crystallization process were about 700 kJ mol 1. The energy of nanocrystal growth was 26.573.9 kJ mol 1. The results present fundamental information about the crystallization behavior of RE2Ti2O7 prepared by the condensation of titanium alkoxides with inorganic salts of rareearth elements.
Permanent Link: http://hdl.handle.net/11104/0233724