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The influence of lithia content on the properties of fluorphlogopite glass-ceramics. I. Nucleation and crystallisation behaviour

Authors
Journal
Journal of Non-Crystalline Solids
0022-3093
Publisher
Elsevier
Publication Date
Volume
319
Identifiers
DOI: 10.1016/s0022-3093(02)01958-0
Disciplines
  • Earth Science

Abstract

Abstract Glasses based on 8SiO 23Al 2O 3(3− S)MgO3MgF 2(1− Z)BaOZK 2OSLi 2O where lithia was substituted for magnesia and baria for potassia were synthesised and characterised by differential scanning calorimetry, combined differental thermal analysis/thermal gravimetric analysis dilatometry and X-ray powder diffraction. The glass transition temperature ( T g) and first peak crystallisation temperature ( T p 1) decreased, whilst the thermal expansion coefficient increased with increasing lithia and potassia content. The glasses exhibited optimum nucleation temperatures close to the experimentally determined T g values indicative of crystal nucleation via prior amorphous phase separation. The first phase to form in the baria containing glasses was barium fluorphlogopite (Ba 0.5Mg 3(Si 3AlO 10)F 2), whilst in the glass compositions containing both lithia and potassia, sellaite (MgF 2) formed prior to formation of potassium fluorphlogopite (KMg 3(Si 3AlO 10)F 2).

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