研究目的
To describe unusual nano-microcrystals of natural diamond found in a meteorite crater and investigate their growth mechanism, morphology, and composition.
研究成果
The nano-microdiamonds exhibit a non-classical growth mechanism through aggregation of globules, indicating a vapor deposition process. They have scientific importance as indicators of cosmic impacts. Future studies could explore similar phenomena in other craters and under controlled synthesis conditions.
研究不足
The internal structure of the polyhedra was not exactly revealed due to small sizes, and the structure of globules is unknown. The study is limited to specific samples from one meteorite crater, and the growth mechanism is inferred rather than experimentally verified.
1：Experimental Design and Method Selection:
The study used scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) to analyze the morphology and composition of diamond nano-microcrystals. The rationale was to observe and characterize the unusual crystals and their growth mechanisms.
2：Sample Selection and Data Sources:
Samples were paramorphoses (impact apographitic diamonds) from the Bilylivka meteorite crater in Ukraine, selected based on their diamond content and morphology.
3：List of Experimental Equipment and Materials:
Scanning electron microscope JSM-6700F equipped with energy-dispersive JED-2300 system (JEOL, Japan), used for imaging and chemical analysis. Samples were diamond paramorphoses.
4：Experimental Procedures and Operational Workflow:
SEM images and EDS analyses were conducted at an accelerating voltage of 20 kV, probe current of 6 × 10^–10 A, and probe diameter of 1–2 μm. The surface of paramorphoses was examined for nano-microcrystals.
5：Data Analysis Methods:
Morphological analysis from SEM images and chemical composition determination from EDS spectra, with compositions given in weight percentages.
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