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J. Korean Ceram. Soc. > Volume 52(2); 2015 > Article
Journal of the Korean Ceramic Society 2015;52(2): 140.
doi: https://doi.org/10.4191/kcers.2015.52.2.140
Effect of Substituting B2O3 for P2O5 in Conductive Vanadate Glass
Suyeon Choi, Jonghwan Kim, Jaeyeop Jung, Hyeonjoon Park, Bongki Ryu
Department of Materials Science and Engineering, Pusan National University
ABSTRACT
In this study, we verified the relationship among the electrical conductivity, chemical durability, and structure of conductive vanadate glass in which $BO_3$ and $BO_4$ and $V^{4+}$ and $V^{5+}$ coexist simultaneously. We prepared samples of vanadium borophosphate glass with various compositions, given by $50V_2O_5-xB_2O_3-(50-x)P_2O_5$(x = 0 ~ 20 mol%) and $70V_2O_5-xB_2O_3-(70-x)P_2O_5$(x = 0 ~ 10 mol%), and analyzed the electrical conductivity, chemical durability, FT-IR spectroscopy, thermal properties, density, and molar volume. Substituting $B_2O_3$ for $P_2O_5$ was found to improve the electrical conductivity, chemical durability, and thermal properties. From these results, we can draw the following conclusions. First, the electrons shift from the electron rich $V^{4+}$ to the electron deficient $BO_3$ as the $B_2O_3$ content increases. Second, the improvement in chemical durability and thermal properties is attributed to an increase in cross-linked structures by changing from a $BO_3$ structure to a $BO_4$ structure.
Key words: Glass, Electrical conductivity, Chemical durability, Structure
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