Barium boron aluminum silicate glass system for solid state optical gas sensors
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2016
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INTERNATIONAL CONFERENCE ON OPTICAL AND ELECTRONIC SENSORS, 14th
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Recent increasing demand for new eco-friendly materials and for low cost fabrication process for use in optical sensors field, raise
concern about alternative materials for this application. We have designed two glass-ceramics compositions from the quaternary ROAl2O3-
SiO2-B2O3(R=Ba) alkali-earth aluminum silicate system, labeled B72 and B69, with high refractive index (>1.6), large values
of Abbe number (94.0 and 53.0, respectively), and free of lead and arsenic. We present an analysis and discussion of experimental
optical properties, thermal and thermo-chemical stability along with important properties such as transition temperature (Tg), onset of
crystallization (Tx) as well transport properties as ionic conductivity behavior in the quaternary glass-ceramic system containing boron
for use as optical sensors. Complex Impedance Spectra (Bode Plot) and Potentiodynamic Polarization curves (Tafel plots)
measurements were carried out in the temperature range of 600 to 850ºC. The most probable conductivity mechanism is a thermally
activated process of mobile ions overcoming a potential barrier (EA), according to the Arrhenius regime. Here we report that charge
transfer is caused by the flux of electrons, in the region of elevated temperatures (>700°C), and is affected by immiscibility of crystals,
nucleation and growth type, that causes phase separation. We found conductivity (σ) values from 10-9 to 10-5 S/cm at temperatures
between 700 and 850ºC. Our results highlight a need for research on ion mobility in the glassy network above the transition range, and
the effect cause by metastable immiscibility in the alkaline-earth glasses are exposed. The two glass compositions B72 and B69 can be
tailored by proper use as glassy optical sensor.
Como referenciar
SILVA, M.J. da; KARCZEWSKI, J.; JASINSKI, P.; CHRZAN, A.; KALINOWSKI, P.; SZYMCZEWSKA, D.; JASINSKI, G. Barium boron aluminum silicate glass system for solid state optical gas sensors. In: JASINSKI, PIOTR (ed.). In: INTERNATIONAL CONFERENCE ON OPTICAL AND ELECTRONIC SENSORS, 14th, June 19, 2016, Gdansk, Poland. Proceedings... p. 101610G-1 - 101610G-9. (SPIE Proceedings Series, 10161). Disponível em: http://repositorio.ipen.br/handle/123456789/27571. Acesso em: 30 Dec 2025.
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