Abstract
Mesoporous CaF2 nanopowders with the specific surface area up to 88.7 m2/g have been produced by the evaporation by a pulsed electron beam in vacuum. The influence of thermal annealing in air on the size and morphology of CaF2 nanoparticles and their magnetic, luminescence, and texture characteristics has been studied. Ferromagnetism of CaF2 nanopowders was discovered for the first time. The influence of radiation defects (CaF2 dye centers) on magnetic properties of CaF2 nanoparticles has been examined.
Highlights
Nanofluorides of alkali-earth metals are promising for applications as catalysts and photonic materials, in particular, precursors of optical ceramics, as well as materials for biomedical applications
The annealing at 900oС has led to an increase in the particle size, which is confirmed by the data of X-ray phase analysis and to the loss in mesoporosity of the S900 specimen
The analysis of the pulsed cathodoluminescence (PCL) spectra and magnetization curves of the СaF2 specimens suggests the presence of corelation between them
Summary
Nanofluorides of alkali-earth metals are promising for applications as catalysts and photonic materials, in particular, precursors of optical ceramics, as well as materials for biomedical applications. Different methods of production of CaF2 nanoparticles, first of all, chemical ones are known [1]. The objective of this paper was to produce the СaF2 nanopowders by the method of evaporation by a pulsed electron beam in vacuum [3] and to study the structure, morphology, magnetic, luminescent, and texture properties of produced nanopowders. 2. Experimental Targets of highly pure CaF2 powders (TU 6-09-2412-84) were made at a hand press. The regime of target evaporation at the Nanobim-2 setup and nanopowder collection, as well as methods of nanopowder diagnostics, is described in [4]. CaF2 nanopowders were annealed in alundum crucibles at a temperature of 200, 400, and 900 oC for 10 min. Nanopowder specimens before and after annealing are designated as S0, S200, S400, and S900, respectively
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