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Controlled nucleation and crystallization in Fe2O3–CaO–SiO2 glass

Authors
 YONG-KEUN LEE  ;  SE-YOUNG CHOI 
Citation
 JOURNAL OF MATERIALS SCIENCE, Vol.32(2) : 431-436, 1997 
Journal Title
 JOURNAL OF MATERIALS SCIENCE 
ISSN
 0022-2461 
Issue Date
1997
Abstract
For the first time controlled nucleation and crystallization were studied for 40Fe2O3–20CaO–40SiO2 (wt%) glass which is useful as thermoseeds for hyperthermia of cancer. To investigate the crystallization mechanism of Fe2O3–CaO–SiO2 glass, the Avrami parameter and the activation energy for crystallization were measured by isothermal and non-isothermal processes using classical and differential thermal analysis techniques. Magnetite was the main crystal phase and the maximum nucleation and crystal growth temperatures were 700 and 1000°C, respectively. The value of kinetic parameters such as the Avrami constant, the activation energy, and the frequency factor, determined using isothermal and non-isothermal processes showed excellent agreement. The slopes of the Kissinger, and Matusita and Sakka plots were almost parallel to each other, and, consequently, crystal growth is believed to occur on a fixed number of nuclei, the m values being considered to be the same as the n values. Using m=1.5 and n=1.5, it was found that diffusion-controlled crystal growth with a constant number of nuclei occurred and these result are in excellent agreement with those determined by the classical technique.
Full Text
https://link.springer.com/article/10.1023/A:1018517819830
DOI
10.1023/A:1018517819830
Appears in Collections:
2. College of Dentistry (치과대학) > Dept. of Dental Biomaterials and Bioengineering (치과생체재료공학교실) > 1. Journal Papers
Yonsei Authors
Lee, Yong Keun(이용근)
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/177340
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