High Electronically Conductive Tungsten Phosphate Glass-Ceramic

Renka, Sanja; Klaser, Teodoro; Burazer, Sanja; Mošner, Petr; Kalenda, Petr; Šantić, Ana; Moguš-Milanković, Andrea (2020) High Electronically Conductive Tungsten Phosphate Glass-Ceramic. Nanomaterials, 10 (12). ISSN 2079-4991

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Abstract

High electronically conductive tungsten phosphate glass-ceramics have been prepared by the controlled crystallization of binary 60WO3– 40P2O5 glass in the temperature range from 700 to 935 ◦C and for 1 to 24 h. The substantial increase in the conductivity for four orders of magnitude is a result of the formation of electronically conductive W2O3(PO4)2 and WO3 phases. At low crystallization temperature the dominant W2O3(PO4)2 phase is created, whereas at 935 ◦C for 24 h the formation of semiconducting WO3 crystallites of an average size of 80 nm enhances the conductivity to the highest value of 1.64 × 10−4 (W cm)–1 at 30 ◦C. The course of the crystallization and its impact on this exceptionally high electronic transport of binary tungsten phosphate glass- ceramics has been discussed in detail. Since such highly electronically conductive WO3-based glass-ceramics have a great potential as cathode/anode materials in solid state batteries and as electrocatalysts in fuel cells, it is of interest to provide a novel insight into the improvement of their electrical properties.

Item Type:

Article

Uncontrolled Keywords:

binary tungsten phosphate glass-ceramics ; crystallization ; electronic transport ; W2O3(PO4)2 phase ; semiconducting WO3 phase

Subjects:

NATURAL SCIENCES > Physics

Divisions:

Division of Materials Chemistry

Projects: