Abstract
The effect of increasing SiO 2 at the expense of B 2 O 3 on the internal structure of xSiO 2-(40-x) B 2 O 3-60Bi 2 O 3 glass matrix (where x=0, 10, 20, 30 and 40 mole %) was investigated. The glass structure was indicated that Bi 3+ cations are incorporated in the glass structure as pyramidal [BiO 3] and [BiO 6] octahedral units and boron ions are incorporated in BO 3 and BO 4 units. The presence of distorted [BiO 6] octahedral units in the glass network was observed and the degree of distortion was found to be decreased on progressive substitution of B 2 O 3 by SiO 2. The results revealed that increase of SiO 2/B 2 O 3 replacements, led to increase the density, microhardness and chemical durability of the studied glasses. However, the molar volume was decreased. The increase of SiO 2/B 2 O 3 replacements generally decreased the AC conductivity. That decrease may be due to the decrease in distortion of [BiO 6] octahedral units in glass network on progressive substitution of B 2 O 3 by SiO 2. Dielectric constants of the samples are complex, which may be an indication of the distortion (number of free charges or broken bonds) in the network of the glass. The obtained experimental data were argued to the internal structure of glass network and the change of the structure of the samples from pyramidal to octahedral and the presence of boron ions in BO 3 and BO 4 units.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
