ChemInform Abstract: High‐Pressure Synthesis and Crystal Structures of the Strontium Oxogallates Sr2Ga2O5 and Sr5Ga6O14.

Kahlenberg, Volker; Goettgens, Valerie Sue; Mair, Philipp; Schmidmair, Daniela

doi:10.1002/chin.201533003

ChemInform

2015

DOI: 10.1002/chin.201533003

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ChemInform Abstract: High‐Pressure Synthesis and Crystal Structures of the Strontium Oxogallates Sr₂Ga₂O₅ and Sr₅Ga₆O₁₄.

Volker Kahlenberg

Valerie Sue Goettgens

Philipp Mair

et al.

Abstract: Single‐crystals of Sr2Ga2O5 (I) and Sr5Ga6O14 (II) are prepared by reaction of a 2:1 molar mixture of SrCO3 and Ga2O3 in air (Pt crucible, 1100 °C, 1 d) and subsequent hot‐press annealing (piston‐cylinder apparatus, 1.5 GPa/3.0 GPa, 1000 °C, 72 h).

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Pressure-induced phase transition of oxygen defective perovskite srebrodolskite Ca2Fe2O5

KUWAMURA,

TAKAGI,

KYONO

2023

Journal of Mineralogical and Petrological Sciences

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To clarify the effect of oxygen defects on the perovskite structure under high pressure, structural changes in srebrodolskite Ca2Fe2O5 were investigated by using high-pressure Raman spectroscopy and synchrotron powder X-ray diffraction analyses. The result of the high-pressure Raman spectroscopic study showed that with compression, a new Raman band appeared at 12.0 GPa. Furthermore, an additional new Raman band appeared at 16.0 GPa. The phase-transition pressure was approximately consistent with the previous research, and the intensities of these new bands became much stronger with increasing pressure. At least nine Raman bands were observable at 23.0 GPa. A highpressure synchrotron powder X-ray diffraction study was performed up to 20.2 GPa. The obtained pressure-volume compression curve apparently deviated from the equation-ofstate of srebrodolskite determined by the previous study above 9.1 GPa, at which point srebrodolskite began to transform into its high-pressure phase. The Rietveld refinement of the X-ray diffraction data at 12.6 GPa fitted with space group Pn21a yielded agreement factors of Rp = 1.46% and wRp = 2.01%. The second high-pressure phase transition A c c e p t e d i n J M P S P r e -p r o o f

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Pressure-induced phase transition of oxygen defective perovskite srebrodolskite Ca2Fe2O5

KUWAMURA,

TAKAGI,

KYONO

2023

Journal of Mineralogical and Petrological Sciences

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show abstract

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ChemInform Abstract: High‐Pressure Synthesis and Crystal Structures of the Strontium Oxogallates Sr₂Ga₂O₅ and Sr₅Ga₆O₁₄.

Abstract: Single‐crystals of Sr2Ga2O5 (I) and Sr5Ga6O14 (II) are prepared by reaction of a 2:1 molar mixture of SrCO3 and Ga2O3 in air (Pt crucible, 1100 °C, 1 d) and subsequent hot‐press annealing (piston‐cylinder apparatus, 1.5 GPa/3.0 GPa, 1000 °C, 72 h).

Cited by 1 publication

References 1 publication

Pressure-induced phase transition of oxygen defective perovskite srebrodolskite Ca<sub>2</sub>Fe<sub>2</sub>O<sub>5</sub>

Pressure-induced phase transition of oxygen defective perovskite srebrodolskite Ca<sub>2</sub>Fe<sub>2</sub>O<sub>5</sub>

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