Co2+-Stuffed Quartz Solid Solutions With Zero Thermal Expansion Synthesized by Sol-Gel Spray-Drying




Quartz Solid Solutions, Zero Thermal Expansion, Glass-Ceramic Powder, Spray-Drying, Sol-Gel


Glassy nanobeads of nominal composition CoO·Al2O3·4SiO2, doped with some Li2O to foster their crystallization, were synthesized by spray-drying from a methanol-based solution. Heat treatments at 850 °C and 900 °C successfully induced the formation of quartz solid solution crystals, whose thermal expansion was found to be very close to zero between 25 °C and 625 °C (average linear coefficient of thermal expansion CTE = 0.3 x 10-6 K-1). Annealing at higher temperatures induced structural unstuffing of the solid solutions, accompanied by the parallel formation of CoAl2O4 spinel and by a color shift of the powders from purple to blue. Sol-gel spray-drying stands out as a highly versatile synthesis method that can harness the thermal expansion tunability of quartz solid solution phases within a (quasi) lithium-free compositional landscape.


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How to Cite

Paiva Da Fonseca, B., Zandonà, A., Helsch, G., & Deubener, J. (2023). Co2+-Stuffed Quartz Solid Solutions With Zero Thermal Expansion Synthesized by Sol-Gel Spray-Drying. Glass Europe, 1, 25–36.
Received 2023-06-13
Accepted 2023-09-11
Published 2023-09-28

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