Open AccessМагнитные и люминесцентные свойства нанопорошка фторида бария, полученного методом испарения импульсным электронным пучком в газе низкого давления
Author(s) -
С.Ю. Соковнин,
Vladislav G. Il’ves,
М. Г. Зуев,
М. А. Уймин
Publication year - 2018
Publication title -
pisʹma v žurnal tehničeskoj fiziki
Language(s) - English
Resource type - Journals
eISSN - 1726-7471
pISSN - 0320-0116
DOI - 10.21883/pjtf.2018.17.46566.17270
Subject(s) - materials science , diamagnetism , annealing (glass) , amorphous solid , paramagnetism , ferromagnetism , nanoparticle , vacuum evaporation , evaporation , electron beam physical vapor deposition , analytical chemistry (journal) , nuclear magnetic resonance , crystallography , nanotechnology , condensed matter physics , magnetic field , chemistry , metallurgy , thin film , physics , chromatography , quantum mechanics , thermodynamics
Mesoporous amorphous-crystalline nanopowders of BaF_2 with the specific surface area up to 34.8 m^2/g were obtained using evaporation by a pulsed electron beam in vacuum. Influence of the thermal annealing of the BaF_2 nanoparticles in air at the temperatures from 200 to 900°C on the size and morphology of the particles and changes in their magnetic and luminescent properties was studied. The paramagnetic response of the BaF_2 nanopowder was found to transform to the ferromagnetic response after annealing at 900°C. The appearance and transformation of the magnetic response in nanopowders made of BaF_2, which is diamagnetic as the bulk material, are ascribed to the appearance of radiation-induced and structural defects during the synthesis process by pulsed electron-beam evaporation.