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Nucleation of Perovskite Nanocrystals in a Levitating Liquid
Author(s) -
Tangeman Jean A.,
Phillips Brian L.,
Hart Robert
Publication year - 2007
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2007.01489.x
Subject(s) - differential scanning calorimetry , materials science , magic angle spinning , nucleation , neutron diffraction , glass transition , nanocrystal , amorphous solid , phase transition , magic angle , chemical engineering , mineralogy , analytical chemistry (journal) , crystallography , chemistry , nanotechnology , thermodynamics , composite material , polymer , nuclear magnetic resonance spectroscopy , organic chemistry , crystal structure , physics , engineering , solid state
Containerless liquid‐phase processing methods were used to synthesize two glasses, both containing alumina (A), yttria (Y), and lanthana (L), and one containing ∼20 mole% silica (S) as well. In both materials, denoted AYL and AYLS, alumina is the dominant component (>50 mole%), and the lanthana:yttria ratio is ∼2:1. A variety of experimental techniques, e.g. X‐ray diffraction, high‐field 27 Al magic angle spinning‐nuclear magnetic resonance (MAS‐NMR), differential scanning calorimetry, and neutron diffraction, were used to analyze both the structure of the amorphous phases resulting from liquid‐phase processing and subsequent thermal treatments, and the thermodynamic properties of the as‐made and heat‐treated materials. The results of the experiments on these glasses and liquids have elucidated the nature of the transitions occurring between the glass transition and crystalline regimes, and have enabled the synthesis of a novel class of alumina‐based nanomaterials.