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Structure and properties of lead-yttrium phosphate glasses
Authors: Račický Antonín | Mošner Petr | Koudelka Ladislav
Year: 2015
Type of publication: článek ve sborníku
Name of source: Proceedings of the 3rd International Conference on Chemical Technology
Publisher name: Česká společnost průmyslové chemie
Place: Praha
Page from-to: 177-180
Titles:
Language Name Abstract Keywords
cze Struktura a vlastnosti olovnato-yttritých fosforečnanových skel Studie se zabývá strukturou, vlastnostmi a termickým chováním skel systémů PbO-Y2O3-P2O5 a PbO-Y2O3-B2O3-P2O5 připravených ve čtyřech kompozičních řadách: (50-a)PbO-aY2O3-50P2O5 (a = 0-10 mol% Y2O3), (40-b)PbO-bY2O3-60P2O5 (b = 0-15 mol% Y2O3), 40PbO-cY2O3-(10-c)B2O3-50P2O5 (c = 0-10 mol% Y2O3) a 30PbO-dY2O3-(20-d)B2O3-50P2O5 (d = 0-20 mol% Y2O3). fosforečnanová skla; Y2O3; struktura; vlastnosti
eng Structure and properties of lead-yttrium phosphate glasses Phosphate glasses of the system (40-x)PbO-xY2O3-60P2O5 were prepared and studied. It was found that yttrium oxide is able to form glasses with the composition (40-x)PbO-xY2O3-60P2O5 in only a narrow concentration range of 0-15 mol% Y2O3, nevertheless the replacement of PbO by Y2O3 leads to often significant changes in the physicochemical and thermal behaviour of these glasses. TD and DSC measurements showed that the incorporation of Y3+ ions into the structural network of the lead phosphate glasses results in an increase of the glass transition temperature and the crystallization temperature. The observed differences in the glass transition temperature indicate an increase in bonding strength with increasing Y2O3 content. Raman spectra indicated that the structural network of the glasses is formed mainly from metaphosphate structural units Q2. The addition of Y3+ ions into the structural network causes partial disproportionation of the phosphate groups according to 2Q2 → Q1 + Q3. phosphate glasses; Y2O3; structure; properties

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