• Wasiucionek, Marek
• Mroczkowska, M.
• Nowiński, Jan
• Garbarczyk, Jerzy

Abstract

Crystallization processes in superionic Agl-Ag2O-P2O5 ([Ag2O]/[P2O5] = 3) glasses were investigated by X-ray, DSC, SEM, and impedance spectroscopy. It was found that the crystallization process depended on the total concentration of the Agi dopant in the material and on the thermal treatment of the glass. During quenching of the glass melt, the following phases are successively formed with increasing total Agi concentration: pure glass without detectable (XRD) traces of crystalline phases, glasses containing β-Agl and some other, unidentified crystallites precipitated on the surface, and finally a composite material, namely a glass matrix in which β/γ-Agl inclusions are embedded. Glasses containing x < 50 mol % of Agi do not crystallize during annealing. Two bulk crystallization processes were identified in solid glasses with 50 < x < 75 mol %. During annealing, the initial product of crystallization transforms to the final one. There is an evidence that crystallization is preceded by a pre- crystallization stage, in which the glass matrix becomes inhomogeneous, forming nano-sized volumes.

Topics

• impedance spectroscopy
• surface
• inclusion
• scanning electron microscopy
• x-ray diffraction
• melt
• crystalline phase
• glass
• glass
• composite
• differential scanning calorimetry
• forming
• annealing
• crystallization
• quenching