The role of TiO{sub 2} in the B{sub 2}O{sub 3}-Na{sub 2}O-PbO-Al{sub 2}O{sub 3} glass system

Journal Article · Tue Nov 15 00:00:00 EST 2011 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2011.09.011· OSTI ID:21580077

Sousa, N C.A. de; Araujo, M.T. de; Jacinto, C; Vermelho, M V.D. ^[1]; Dantas, N O ^[2]; Santos, C C ^[3]; Guedes, I ^[4]

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1. Instituto de Fisica, Universidade Federal de Alagoas, 57072-970 Maceio, AL (Brazil)
2. Laboratorio de Novos Materiais Isolantes e Semicondutores (LNMIS), Instituto de Fisica, Universidade Federal de Uberlandia, 38400-902 Uberlandia, MG (Brazil)
3. Departamento de Fisica, CCET, Universidade Federal do Maranhao, 65085-580 Sao Luis, MA (Brazil)
4. Departamento de Fisica, Universidade Federal do Ceara, Campus do PICI, Caixa Postal 6030, 60455-760 Fortaleza, CE (Brazil)

Optical and vibrational studies have been carried out on 60B{sub 2}O{sub 3}.(20-x)Na{sub 2}O.10PbO.10Al{sub 2}O{sub 3}:xTiO{sub 2} (x=0, 1, 2, 3, 4, and 5 mol%) glasses, in order to understand the role of TiO{sub 2} in the 60B{sub 2}O{sub 3}.20Na{sub 2}O.10PbO.10Al{sub 2}O{sub 3} 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 ({Delta}E{sub opt}) and Urbach's energy (E{sub U}) decreases as TiO{sub 2} content increases. The changes observed in the Raman and IR spectra are related to the BO{sub 4}{yields}BO{sub 3} back conversion effect and the appearance of 'loose' BO{sub 4}{sup -} groups. The data indicate that titanium ions act as a network modifier. - Graphical abstract: Behavior of the relative integrated intensity of the IR bands, Ar=A{sub 4}/A{sub 3}, as TiO{sub 2} content increases. A decrease of 45% of Ar indicates that the number of BO{sub 4} groups is decreasing due to the BO{sub 4}{yields}BO{sub 3} back conversion. Highlights: > The XRD data show the amorphous character of all measured glasses. > The optical absorption results evidenced possible change of the glass structure. > The Raman data have revealed some vibrational modifications. > The overall results indicate that titanium acts as a network modifier.

• OSTI ID: 21580077
• Journal Information: Journal of Solid State Chemistry, Vol. 184, Issue 11; Other Information: DOI: 10.1016/j.jssc.2011.09.011; PII: S0022-4596(11)00502-0; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ABSORPTION
ABSORPTION SPECTRA
ALUMINIUM OXIDES
BORATES
BORON OXIDES
GLASS
INFRARED SPECTRA
LEAD OXIDES
RAMAN SPECTRA
SODIUM OXIDES
TITANIUM IONS
TITANIUM OXIDES
X RADIATION
X-RAY DIFFRACTION
ALKALI METAL COMPOUNDS
ALUMINIUM COMPOUNDS
BORON COMPOUNDS
CHALCOGENIDES
CHARGED PARTICLES
COHERENT SCATTERING
DIFFRACTION
ELECTROMAGNETIC RADIATION
IONIZING RADIATIONS
IONS
LEAD COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
RADIATIONS
SCATTERING
SODIUM COMPOUNDS
SORPTION
SPECTRA
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS