ISIS Neutron and Muon Source Data Journal

Continuation: The germanate anomaly in barium germanate optical glasses

Abstract: We propose herein to measure the structure of a series of barium germanate glasses, using neutron diffraction and pair distribution function determination, in order to verify, or otherwise, the putative structural similarity with previously measured calcium germanate glasses. Binary alkali and alkaline earth germanate glasses, in analogy to borate glasses, tend to exhibit extrema in their physical properties as a function of glass composition. This phenomenon has been referred to as the germanate (or borate) anomaly (with respect to silicates), and has been explained, at least in part, by changes in the Ge-O (or B-O) coordination number, nGeO, which goes through a maximum, including in the Ca germanate glasses. Since both Ba and Ca germanate glasses show similar mass density maxima, for example, it is hypothesized that the behaviour of nGeO with composition will be similar, but this remains untested.

Principal Investigator: Mr Reuben Tosh
Local Contact: Dr Oliver Alderman
Experimenter: Dr Emma Barney

DOI: 10.5286/ISIS.E.RB2620856

ISIS Experiment Number: RB2620856

Publisher: STFC ISIS Neutron and Muon Source

Data format: RAW/Nexus
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Data Citation

The recommended format for citing this dataset in a research publication is as:
[author], [date], [title], [publisher], [doi]

For Example:
Mr Reuben Tosh et al; (2026): Continuation: The germanate anomaly in barium germanate optical glasses, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB2620856

Data is released under the CC-BY-4.0 license.