Structural Relaxation of Oxide Compounds from the High-Pressure Phase

Yusa, Hitoshi

doi:10.1007/978-981-10-7617-6_12

Cited by 5 publications

(2 citation statements)

References 53 publications

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“…Unquenchable high-pressure phases are not rare (cf. Yusa, 2017) and are also known in ZnSiO 3 pyroxene phases (Arlt and Angel, 2000).…”

Section: Resultsmentioning

confidence: 97%

Pressure–induced phase transitions of Zn2SiO4 III and IV studied using in–situ Raman spectroscopy

Kanzaki

2018

Journal of Mineralogical and Petrological Sciences

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Recent structural study of the high-pressure Zn 2 SiO 4 phases III and IV has suggested that they are retrograde phases formed during decompression. To clarify the stabilities of these phases under pressure, in-situ highpressure Raman spectroscopic measurements were taken at room temperature. Phase III, having a 'tetrahedral olivine' structure, transformed to a new phase at 5.5 GPa during compression and returned to phase III at 1.7 GPa during decompression. Phase IV also exhibited a phase transition at 2.5 GPa with very small hysteresis. Both transitions are first-order. These observations confirmed that phases III and IV are retrograde phases.

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“…Unquenchable high-pressure phases are not rare (cf. Yusa, 2017) and are also known in ZnSiO 3 pyroxene phases (Arlt and Angel, 2000).…”

Section: Resultsmentioning

confidence: 97%

Pressure–induced phase transitions of Zn2SiO4 III and IV studied using in–situ Raman spectroscopy

Kanzaki

2018

Journal of Mineralogical and Petrological Sciences

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“…Therefore, these phases are apparently not high-pressure phases, and are likely transformed from yet unknown high-pressure phases during the decompression process. This sort of the retrograde phase transformation of high-pressure phase during decompression to a metastable phase are known for other compounds [9]. Phase V was identified to have modified spinel structure [1], and its crystal structure was refined recently [10].…”

Section: Introductionmentioning

confidence: 82%

High-pressure phase relations in Zn2SiO4 system: A first-principles study

Kanzaki

2019

Preprint

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Recent experimental studies have shown that phases III and IV of Zn2SiO4 recovered from highpressure experiments are retrograde phases. In order to clarify the phase relation of this system, first-principles density functional theory calculations of 11 Zn2SiO4 phases including phases III and IV were conducted. Phase III, having a tetrahedral olivine structure, exhibited an extraordinarily high compressibility, which is due to large volume reductions in vacant octahedral sites corresponding to M 1 and M 2 sites in olivine structure. Both phases III and IV have much higher enthalpies compared to those of phases II and V up to 10 GPa, and they are not stable high-pressure phases. Instead, Na2CrO4-and Ag2CrO4-structured phases have volumes and enthalpies next to phase V at around 9 GPa, and they are most likely candidate structures for high-pressure phases of III and IV, respectively. In both structures, a half of Zn is occupying a tetrahedral site, and the remaining half is occupying an octahedral site. Compared to those phases, olivine phase has slightly higher volume and enthalpy, being a less likely candidate. "Phase transitions" of phases II, III and IV observed during structural optimization under pressure are also reported. The transition of phase II was discussed in relation to similar transition known for Si3N4.

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High-Temperature Proton Conductors Containing Rare Earths

Wang

2023

Theory and Application of Rare Earth Materials

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Structural Relaxation of Oxide Compounds from the High-Pressure Phase

Cited by 5 publications

References 53 publications

Pressure–induced phase transitions of Zn<sub>2</sub>SiO<sub>4</sub> III and IV studied using in–situ Raman spectroscopy

Pressure–induced phase transitions of Zn<sub>2</sub>SiO<sub>4</sub> III and IV studied using in–situ Raman spectroscopy

High-pressure phase relations in Zn2SiO4 system: A first-principles study

High-Temperature Proton Conductors Containing Rare Earths

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