Research Data:
TEM data for the first observation of quenched Davemaoite to Ambient Conditions: its Electron Diffraction Pattern

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datacite.resourcetypeTEM data
dc.contributor.authorMiyajima, Nobuyoshi
dc.contributor.contactpersonMiyajima, Nobuyoshi
dc.contributor.researcherWang, Lin
dc.contributor.researcherKatsura, Tomoo
dc.contributor.supervisorMiyajima, Nobuyoshi
dc.date.accessioned2025-09-14T10:32:53Z
dc.date.available2025-09-14T10:32:53Z
dc.date.issued2025-09-11
dc.description.abstractCalcium-rich silicate perovskite, davemaoite is often completely amorphized at ambient pressure, because the perovskite structure containing large element is unstable at 1 bar. However, we obtained for the first time an electron diffraction pattern of davemaoite in a transmission electron microscope. To understand why the unstable crystalline davemaoite lasted so long in the microscope, we investigate the textures with surrounding minerals using the electron-beam imaging and analyze the ambient volume from the diffraction patterns to understand the survival mechanisms. We find that the preservation of the crystalline state is most likely due to a static pressure generated by volume expansion of the surrounding amorphous glass transformed from the precursor denser crystalline state. The mechanism had not been demonstrated experimentally in a sub-micrometer microscopy before, even in the recovery of high-pressure minerals in shocked meteorites. Understanding this mechanism is important because the other high-pressure minerals at a small domain might survive at much lower pressure than the stability field at high pressure even though they are usually unquenchable. Further high-pressure minerals under a static stress can be discovered at ambient conditions by fine electron microscopy.en_US
dc.identifier.urihttps://rdspace.uni-bayreuth.de/handle/rdspace-ubt/384
dc.identifier.urihttps://doi.org/10.57880/rdspace-ubt-47
dc.language.isoen_US
dc.rights.licenseCreative Commons Attribution Share Alike 4.0 International
dc.rights.spdx-idCC-BY-SA-4.0
dc.rights.urihttps://spdx.org/licenses/CC-BY-SA-4.0.html
dc.subjectelectron microscopy
dc.subjectdavemaoite
dc.subjectElectron Diffraction Pattern
dc.subjectTransmission electron microscopy
dc.subject.openaire01 natural sciences :: 0105 earth and related environmental sciences :: 010502 geochemistry & geophysics
dc.titleTEM data for the first observation of quenched Davemaoite to Ambient Conditions: its Electron Diffraction Patternen_US
dc.typeExperimental Data
dspace.entity.typeResearchData
local.assignedto.researchcenterBavarian Research Institute of Experimental Geochemistry and Geophysics
local.assignedto.universityUniversity of BayreuthnullUniversität Bayreuth
local.retention.typepublication
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relation.isLicenseOfResearchData.latestForDiscovery3d1e1cd3-a47e-443a-97c8-3bc15eef1da2
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