Short-range and medium-range order in amorphous barium germanate

H. Schlenz; S. Rings; M. Schmücker; K. Schulmeister; W. Mader; A. Kirfel; J. Neuefeind

doi:10.1016/S0022-3093(03)00026-7

Short-range and medium-range order in amorphous barium germanate

H. Schlenz, S. Rings, M. Schmücker, K. Schulmeister, W. Mader, A. Kirfel, J. Neuefeind

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

Amorphous barium germanate of composition BaGe_2.55O_6.10 was prepared by ultra-rapid quenching using a double-roller melt-spinning device. The short-range and medium-range order was investigated by high-energy synchrotron X-ray diffraction, resonant scattering at the Ba K-absorption edge and by electron diffraction. There are indications that 6-fold coordinated germanium exists in the structure of the present amorphous alkaline earth germanate, i.e. both GeO₄ tetrahedra and GeO₆ octahedra are supposed to be basic building units. The ratio of 6-fold coordinated Ge to 4-fold coordinated Ge is approximately 1:3. A structure model is proposed which favours the existence of barium chains and/or barium layers, similar to the structure of barium silicate glasses.

Original language	English
Pages (from-to)	133-142
Number of pages	10
Journal	Journal of Non-Crystalline Solids
Volume	320
Issue number	1-3
DOIs	https://doi.org/10.1016/S0022-3093(03)00026-7
State	Published - Jun 1 2003
Externally published	Yes

Funding

Financial support of the Sonderforschungsbereich 408 by the Deutsche Forschungsgemeinschaft (Bonn, Germany) and the constructive comments of two anonymous reviewers are gratefully acknowledged.

Funders	Funder number
Deutsche Forschungsgemeinschaft

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10.1016/S0022-3093(03)00026-7

Cite this

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abstract = "Amorphous barium germanate of composition BaGe2.55O6.10 was prepared by ultra-rapid quenching using a double-roller melt-spinning device. The short-range and medium-range order was investigated by high-energy synchrotron X-ray diffraction, resonant scattering at the Ba K-absorption edge and by electron diffraction. There are indications that 6-fold coordinated germanium exists in the structure of the present amorphous alkaline earth germanate, i.e. both GeO4 tetrahedra and GeO6 octahedra are supposed to be basic building units. The ratio of 6-fold coordinated Ge to 4-fold coordinated Ge is approximately 1:3. A structure model is proposed which favours the existence of barium chains and/or barium layers, similar to the structure of barium silicate glasses.",

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AU - Schlenz, H.

AU - Rings, S.

AU - Schmücker, M.

AU - Schulmeister, K.

AU - Mader, W.

AU - Kirfel, A.

AU - Neuefeind, J.

PY - 2003/6/1

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AB - Amorphous barium germanate of composition BaGe2.55O6.10 was prepared by ultra-rapid quenching using a double-roller melt-spinning device. The short-range and medium-range order was investigated by high-energy synchrotron X-ray diffraction, resonant scattering at the Ba K-absorption edge and by electron diffraction. There are indications that 6-fold coordinated germanium exists in the structure of the present amorphous alkaline earth germanate, i.e. both GeO4 tetrahedra and GeO6 octahedra are supposed to be basic building units. The ratio of 6-fold coordinated Ge to 4-fold coordinated Ge is approximately 1:3. A structure model is proposed which favours the existence of barium chains and/or barium layers, similar to the structure of barium silicate glasses.

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Short-range and medium-range order in amorphous barium germanate

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