Тип публикации: статья из журнала
Год издания: 2024
Идентификатор DOI: 10.1134/S106378422407048X
Ключевые слова: vacuum arc, oxides, nanoparticles, Magnetodielectric effect
Аннотация: CuO nanoparticles obtained in a low-pressure arc discharge plasma followed by annealing in an oxygen atmosphere at 500°C were studied by X-ray diffraction and transmission electron microscopy. The formation of irregularly shaped nanoparticles in the size range of 5–30 nm was found. The Rietveld refinement confirmed the formation ofПоказать полностьюa monoclinic CuO phase with an average crystallite size of ~21 nm. The temperature dependences of the magnetization and permittivity of CuO nanoparticles have been studied. They show antiferromagnetic behavior with a Neel temperature of 230 K and frequency-dependent dispersion behavior in the temperature range of 100–200 K at an external magnetic field induction of 0–1.3 T. The dielectric relaxation mechanism is analyzed and found to follow the Arrhenius behavior. It is shown that hopping conductivity with a variable hop length more accurately describes charge transport in CuO nanoparticles. A magnetodielectric response of about 2.5 was observed at a frequency of 12 kHz at a temperature of 150 K in a magnetic field of 1.3 T.
Журнал: Technical Physics
Выпуск журнала: Т. 69, № 7
Номера страниц: 2163-2169
ISSN журнала: 10637842
Место издания: Санкт-Петербург
Издатель: Pleiades Publishing, Ltd. (Плеадес Паблишинг, Лтд)