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OpenAIRE Fields of Science: 0105 earth and related environmental sciences ×

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    Research DataOpen Access
    TEM data for the first observation of quenched Davemaoite to Ambient Conditions: its Electron Diffraction Pattern
    (2025-09-11) Miyajima, Nobuyoshi
    Calcium-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.
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    Research DataOpen Access
    Data for "Fresh and degraded maize shoot and root residues temporarily change soil hydraulic properties"
    (2026-03-18) Leuther, Frederic
    In a laboratory study, we quantified the effect of maize crop residues (CR) in various concentrations (0, 2, and 5 wt.%) on the SHP of a loam soil and additionally measured the SHP of a mulch layer (100 wt.% CR) from saturation to oven dryness. We differentiated between shoot and root CR to quantify the effect of biomass quality and adapted the simplified evaporation method to measure the hydraulic properties of 100% CR layer. The experiments were run in triplicate and repeated after three weeks of incubation under optimal conditions for biological activity (30 °C, 90% RH) to simulate organic matter degradation after harvest. This dataset contains soil hydraulic measurements taken pre and post-incubation.