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Effect of B 2 O 3 Addition on the Thermal Properties and Structure of Bulk and Powdered Barium Phosphate Glasses
Author(s) -
Harada Takashi,
Takebe Hiromichi,
Kuwabara Makoto
Publication year - 2006
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.1551-2916.2005.00656.x
Subject(s) - metaphosphate , barium , crystallization , x ray photoelectron spectroscopy , raman spectroscopy , analytical chemistry (journal) , thermal expansion , glass transition , materials science , differential thermal analysis , crystallography , mineralogy , phosphate , chemistry , nuclear magnetic resonance , diffraction , polymer , physics , organic chemistry , chromatography , optics , metallurgy , composite material
The glass transition temperature increases and the thermal expansion coefficient and density decrease with increasing B 2 O 3 concentration in a series of (100− x )(50BaO–50P 2 O 5 )− x B 2 O 3 where x =0–10 mol% for bulk samples. According to Raman spectroscopy, the bulk BaO–P 2 O 5 –B 2 O 3 (BaP–B) glasses consist of metaphosphate Q 2 units with ring‐type metaborate, diborate, and PO 4 –BO 4 groups. X‐ray photoelectron spectroscopy results reveal qualitatively that P–O–B bonds are formed at the surface of BaP–B glass samples ground in laboratory air over 6 mol% B 2 O 3 only. The P–O–B bonds are related to the suppression of the crystallization of powdered BaP–B glasses with >6 mol% B 2 O 3 during differential thermal analysis.