The role of TiO2 in the B2O3–Na2O–PbO–Al2O3 glass system |
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| Authors: | NCA de Sousa MT de Araujo C Jacinto MVD Vermelho NO Dantas CC Santos I Guedes |
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| Institution: | aInstituto de Física, Universidade Federal de Alagoas, 57072-970 Maceió, AL, Brazil;bLaboratório de Novos Materiais Isolantes e Semicondutores (LNMIS), Instituto de Física, Universidade Federal de Uberlândia, 38400-902 Uberlândia, MG, Brazil;cDepartamento de Física, CCET, Universidade Federal do Maranhão, 65085-580 São Luis, MA, Brazil;dDepartamento de Física, Universidade Federal do Ceará, Campus do PICI, Caixa Postal 6030, 60455-760 Fortaleza, CE, Brazil |
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| Abstract: | Optical and vibrational studies have been carried out on 60B2O3·(20−x)Na2O·10PbO·10Al2O3:xTiO2 (x=0, 1, 2, 3, 4, and 5 mol%) glasses, in order to understand the role of TiO2 in the 60B2O3·20Na2O·10PbO·10Al2O3 glass matrix. The X-ray patterns reveal homogeneous glasses over the entire compositional range. The absorption spectra show that the energy of the optical band gap (ΔEopt) and Urbach's energy (EU) decreases as TiO2 content increases. The changes observed in the Raman and IR spectra are related to the BO4→BO3 back conversion effect and the appearance of “loose” BO4− groups. The data indicate that titanium ions act as a network modifier. |
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| Keywords: | Raman spectra Infrared spectra Glass |
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