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Crystallization Behaviors of PbSe Quantum Dots in Silicate Glasses
Author(s) -
Ma DeWei,
Cheng Cheng
Publication year - 2013
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/jace.12283
Subject(s) - crystallization , nucleation , fragility , silicate glass , materials science , glass transition , precipitation , chemical engineering , chemical physics , mineralogy , thermodynamics , polymer , chemistry , composite material , physics , meteorology , engineering
This study, composed of three parts, aims at studying the crystallization behaviors of PbSe quantum dots ( QD s) in silicate host glasses. Firstly, due to the importance of the choice of base glass for the QD s' crystallization, the selection of base glass compositions, the glass fragility, and glass formation ability ( GFA ) are discussed in details, and the results show that the selected glass compositions have an intermediate fragility and accordingly an intermediate glass transition temperature range among a wide variety of inorganic glass systems together with a good GFA /glass stability ( GS ). Thus, this base glass is suitable as the host glass in which PbSe QD s crystallize. Secondly, the experimental results on PbSe QD s' crystallizations are presented, and the results show that PbSe QD s can precipitate from silicate glasses favorably with no other chemical compounds precipitation, and the optimized temperature for PbSe QD s crystallization is 600°C. Lastly, the classical nucleation theory is used to analyze the PbSe QD crystallization behaviors in host glasses. The steady‐state nucleation rates and the growth rates of PbSe QD s as well as the time–temperature transformation ( TTT ) curves are calculated. The results indicate that the free surface energy between the PbSe nuclei and the host glass has great influence on the nucleation rates of PbSe QD s, while it has less effect on the growth rates of PbSe QD s; the crystallization behaviors of PbSe QD s with different volume fractions can be described well by the TTT curves while keeping the dimensionless empirical constant, α, unchanged for one certain curve.