Premium
Effect of Heat Treatment on Rapidly Quenched AgI‐Based Silver Orthoborate Glasses Containing Large Amounts of AgI
Author(s) -
Itakura Nobuyuki,
Tatsumisago Masahiro,
Minami Tsutomu
Publication year - 1997
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.1151-2916.1997.tb03252.x
Subject(s) - differential scanning calorimetry , crystallization , materials science , phase (matter) , microstructure , scanning electron microscope , analytical chemistry (journal) , crystallography , mineralogy , chemical engineering , thermodynamics , chemistry , composite material , physics , organic chemistry , chromatography , engineering
The effect of heat treatment on the twin‐roller rapidly quenched 75AgI·18.7Ag 2 O6.3B 2 O 3 glass was investigated by differential scanning calorimetry (DSC), high‐temperature X‐ray diffraction (XRD), and field‐emission‐type scanning electron microscopy. The glass had an inhomogeneous microstructure with dispersed particles 40‐60 nm in diameter at room temperature. On the other hand, island regions of several hundred nanometers with fine dispersed particles about 20‐30 nm in diameter were observed in the glass after heating to 120°C. DSC and high‐temperature XRD measurements revealed that crystallization occurred at around 120°C, which is lower than the α‐β phase transformation temperature (147°C), to form α‐AgI in the glass. The crystallization of α‐AgI from the glass below the α‐ß phase transformation temperature strongly supports the possibility of the existence of α‐AgI nuclei in AgI‐based silver orthoborate glasses. Validating the existence of AgI microcrystals supports the microdomain model for superionic AgI‐based glasses.