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Effects of Pressure and Pressure Revitrification on the Structure and Properties of Superionic Silver Iodomolybdate Glasses

Studies of silver iodomolybdate glasses have shown that pressure affects their properties in several distinct ways. First there is a temporary elastic compression effect below T g . Changes in ionic conductivity are consistent with the normal activation volume for Ag + ion migration. Then there is reversible densification which occurs when a glass is revitrified at high pressure (50 kbar) and at high temperatures but is reversed when the resulting glass is heated through T g . Finally, there are irreversible changes when glasses rich in AgI are revitrified at high pressures above Tg which are associated with disproportionation reactions leading to the appearance of biphasic systems. This last case demonstrates the possibility of producing entirely new kinds of glass with structures critically dependent on their pressure/temperature histories.