Cobalt in Co-Zn metaphosphate and pyrophosphate glasses: Structure , coordination and thermal properties

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F25%3A39923127" target="_blank" >RIV/00216275:25310/25:39923127 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1016/j.jnoncrysol.2025.123782" target="_blank" >https://doi.org/10.1016/j.jnoncrysol.2025.123782</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jnoncrysol.2025.123782" target="_blank" >10.1016/j.jnoncrysol.2025.123782</a>

Result language

angličtina

Original language name

Cobalt in Co-Zn metaphosphate and pyrophosphate glasses: Structure , coordination and thermal properties

Original language description

The interaction of cobalt in a wide compositional range was studied in Co-Zn phosphate glasses. Metaphosphate glasses xCoO-(50-x)ZnO-50P2O5, i.e. glasses with the same anion, and glasses in which the anion simultaneously changes from metaphosphate to pyrophosphate with increasing cobalt concentration, meta-pyro series, yCoO-(50-0.75y)ZnO-(50-0.25y)P2O5, were prepared. XRF, Raman spectra and 31P MAS NMR confirmed the desired chemical composition of all the prepared glasses. The electronic spectra demonstrated both the tetrahedral and octahedral coordination of the Co(+II). The combination with Raman spectroscopy showed a predominant tetrahedral coordination. A simple chemical model of meta-pyro series was proposed. The Co-O(P) bond was found to be considerably polar, thereby increasing the density of weak interactions in the glass network, which in turn caused an increase in Tg with increasing Co content in both series. It was determined that the coefficient of thermal expansion increases with rising cobalt concentration. This is related to the assumption of a higher amplitude of vibrations of the Co-O(P) bond compared to the Zn-O(P) bond, indicating the increasing asymmetry of the Morse potential. The compositional dependence of density and molar volume indicates the increasing compactness of the glass structure with increasing cobalt content.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10402 - Inorganic and nuclear chemistry

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Non-Crystalline Solids

ISSN

0022-3093

e-ISSN

1873-4812

Volume of the periodical

668

Issue of the periodical within the volume

November 2025

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

11

Pages from-to

123782

UT code for WoS article

001577811100002

EID of the result in the Scopus database

2-s2.0-105016316531