研究目的
To obtain nanopowders (NPs) of BaF2 and CaF2 using electron beam evaporation in a vacuum, and also to investigate the structural, morphological, magnetic, luminescent and textural properties of the obtained NPs.
研究成果
Mesoporous nanopowders of BaF2 and CaF2 with strong violation of stoichiometry due to an excess of metal were produced. The study found the growth of the NP CaF2 and BaF2 specific surface after annealing at a temperature of 200°C and an increase in the intensity of the red strip NP BaF2 by 2.1 times after annealing. For the first time, PM behavior of the BaF2 nanopowders and FM response at NP CaF2 was found, which can be explained by the formation of structural and radiation defects during producing NP. The analysis of the PCL and magnetization curves of samples allows conclusions to be drawn on their connection.
研究不足
The study is limited by the technical constraints of the pulsed electron beam evaporation method and the potential for optimization in the annealing process to further enhance the properties of the NPs.
1：Experimental Design and Method Selection:
The NPs were produced by the pulsed electron beam evaporation method in vacuum. The influence of thermal annealing on the size, morphology, and magnetic and luminescent properties of the NPs was investigated.
2：Sample Selection and Data Sources:
Targets from the BaF2 micron powder of optical purity and CaF2 were pressed and sintered in an electric furnace in air at a temperature of 900°C.
3：List of Experimental Equipment and Materials:
Installation Nanobim-2 for evaporation, Micromeritics TriStar 3000 for specific surface area measurement, Shimadzu X-ray diffractometer XRD-7000 for crystal structure characterization, LEO982 scanning electron microscope with Oxford X-Ray Detector for SEM images and EDX analysis, JEOL JEM 2100 Transmission Electron Microscope for TEM images, Faraday balance magnetometer for magnetization curves measurement, MDR-204 device for photoluminescence spectra recording, KLAVI-1 device for pulse cathode luminescence spectra recording.
4：Experimental Procedures and Operational Workflow:
The NPs were deposited onto the support of ordinary glass, annealed at different temperatures, and their properties were characterized using the mentioned equipment.
5：Data Analysis Methods:
The data were analyzed using the Brunauer-Emmet-Teller (BET) method for specific surface area, X-ray phase analysis for crystal structure, SEM and TEM for morphology and size, EDX for elemental analysis, and PL and PCL spectra for luminescent properties.
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