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  Tracing the phase formation and stability of the clathrate phase BaGe5

Aydemir, U., Baitinger, M., Grin, Y., & Burkhardt, U. (2024). Tracing the phase formation and stability of the clathrate phase BaGe5. Materialia, 34: 102096, pp. 1-9. doi:10.1016/j.mtla.2024.102096.

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 Creators:
Aydemir, Umut1, Author           
Baitinger, Michael2, Author           
Grin, Yuri3, Author           
Burkhardt, Ulrich4, Author           
Affiliations:
1Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863405              
2Michael Baitinger, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863416              
3Juri Grin, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863413              
4Ulrich Burkhardt, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863422              

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Free keywords: Bage5, Clathrate, Microstructure, Phase diagram, Thermal analysis, Barium compounds, Crystal structure, Differential scanning calorimetry, Germanium compounds, Hydrates, Microstructure, Temperature, Bage5, Clathrate phase, Clathrates, Crystals structures, Experiment confirm, High-temperature phasis, I-phase, Microstructures analysis, Peritectic, Phase formations, Thermoanalysis
 Abstract: Thermal stability and phase formation of the clathrate phase BaGe5 and its formation from the clathrate-I phase Ba8Ge43□3 (□ = vacancy in the crystal structure) have been investigated by microstructure analysis, differential scanning calorimetry (DSC), and powder X-ray diffraction (PXRD). The experiments confirm the peritectic formation of the high-temperature phase Ba8Ge43□3 from α-Ge and liquid at 810 °C, and the eutectic temperature of Ba8Ge43□3 and Ba6Ge25 at 808 °C. At T = 770 °C, Ba8Ge43□3 decomposes by a eutectoid reaction to Ba6Ge25 and α-Ge, and at T = 520 °C, the low-temperature phase BaGe5 forms in a peritectoid reaction from these two phases. BaGe5 was synthesized by decomposition of the high-temperature clathrate-I phase Ba8Ge43□3 at temperatures between 350 °C and 520 °C. Annealing and DSC experiments verify that BaGe5 is an equilibrium phase at ambient pressure. The formation of BaGe5 from Ba8Ge43□3 was traced through microstructure analysis, revealing microdomains with pleochroic behavior in polarized light. © 2024 Acta Materialia Inc.

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Language(s): eng - English
 Dates: 2024-04-252024-04-25
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.mtla.2024.102096
 Degree: -

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Title: Materialia
  Abbreviation : Materialia
Source Genre: Journal
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Publ. Info: Elsevier Ltd.
Pages: - Volume / Issue: 34 Sequence Number: 102096 Start / End Page: 1 - 9 Identifier: ISSN: 2589-1529
CoNE: https://pure.mpg.de/cone/journals/resource/2589-1529