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The influence of nickel on the chemistry of nickel-zinc phosphate glasses
Year: 2025
Type of publication: článek v odborném periodiku
Name of source: Journal of Non-Crystalline Solids
Publisher name: Elsevier Science BV
Place: Amsterdam
Page from-to: 123401
Titles:
Language Name Abstract Keywords
cze Vliv niklu na chemii nikel-zinečnatých fosfátových skel Skla systému NiO-ZnO-P2O5 byla připravena ve dvou kompozičních řadách, metafosforečnanové a řadě, kde se byla zajištěna změna aniontu. Koordinace Ni ve skelné struktuře byla studována za použití magnetické susceptibility, Ramanovy a elektronové absorpční spektroskopie. Nikl; fosfátová skla; Ramanova spektroskopie; UV-VIS spektroskopie; 31P MAS NMR
eng The influence of nickel on the chemistry of nickel-zinc phosphate glasses The glasses of the NiO-ZnO-P2O5 system were prepared in two compositional series formally expressed in oxides: metaphosphate series (A), i.e. without changing the anion, xNiO-(50-x)ZnO-50P2O5 and the metaphosphate to pyrophosphate series (B), i.e. with changing the anion, xNiO-(50-0.75x)ZnO-(50-0.25x)P2O5. Using magnetic susceptibility, Raman spectroscopy and electron absorption spectroscopy it was determined that all glasses containing nickel were paramagnetic with Ni2+ tetrahedral coordination. The Ni-O(P) bond was found to have a higher ionicity compare to Zn-O(P) bond. If metaphosphate is changed to pyrophosphate, series (B), glasses can only be prepared up to 20 mol% of NiO and at higher concentration crystalline nickel pyrophosphate appears. It follows that Ni2+ ions do not connect pyrophosphate structural units and are therefore unable to form a cationically linked glass network. The glass transition temperature and the coefficient of thermal expansion are related to the concentration of metaphosphates and, in principle, increase with rising nickel content. Nickel; Phosphate glasses; Raman spectroscopy; UV-VIS spectroscopy; 31P MAS NMR

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