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Crystallization of Lead Niobate Glass by Mechanical Activation
Author(s) -
Xue Junmin,
Wang John
Publication year - 2001
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.1151-2916.2001.tb01072.x
Subject(s) - crystallization , nucleation , materials science , amorphous solid , activation energy , thermal stability , nanocrystal , amorphous metal , chemical engineering , high resolution transmission electron microscopy , composite material , mineralogy , crystallography , chemistry , nanotechnology , transmission electron microscopy , organic chemistry , engineering , alloy
Mechanical activation‐triggered crystallization in PbNb 2 O 6 ‐based glass was dependent on the initial presence of nuclei. The crystallization cannot be initiated by mechanical activation in a highly amorphous glass composition quenched from 1350°C where PbNb 2 O 6 nuclei did not exist. The steady growth of nanocrystallites of PbNb 2 O 6 was observed with an increasing degree of mechanical activation in the glass quenched from 1300°C, where a density of PbNb 2 O 6 nuclei existed before mechanical activation. The inability to nucleate in the highly amorphous oxide glass by mechanical activation is consistent with the much higher structural stability as compared with that of metallic glasses, such as Fe‐Si‐B. The mechanical activation‐grown PbNb 2 O 6 nanocrystals were 10–15 nm in size as observed using HRTEM and their crystallinities were further improved by thermal aging at an elevated temperature in the range of 550° to 650°C.