EPR Investigations of Electrons and Neutrons Irradiated Cubic Boron Nitride

Microcrystals of cubic boron nitride powders synthesised under different conditions and further irradiated with neutrons and electrons have been investigated. It was found that some changes of the samples' paramagnetic properties depend on the electron irradiation dose. It was also shown that the initial boron type defects growth occurs under thermal neutron, as well as under fast neutrons irradiation. The nitrogen-containing defects concentration changes in a threshold manner

EPR Investigations of Electrons and Neutrons Irradiated Cubic Boron Nitride

Microcrystals of cubic boron nitride powders synthesised under different conditions and further irradiated with neutrons and electrons have been investigated. It was found that some changes of the samples' paramagnetic properties depend on the electron irradiation dose. It was also shown that the initial boron type defects growth occurs under thermal neutron, as well as under fast neutrons irradiation. The nitrogen-containing defects concentration changes in a threshold manner

За кадры. 1980. № 36 (2260)

Практика помогла / В. МашничНаграда за творчество / Б. Лукутин"Север" отправляется на Север / Ю. ДементьевТрудно наверстать упущенное / А. Д. ЧесалинУчеба молодых преподавателей / Л. М. СедоковРоль интеллигенции в социалистическом обществе / Г. ЯловскаяЗа красоту родного городаКак это называется? Тревожный сигнал из библиотеки / А. ЩербининНовая рота / С. ДутовПод контролем трудовая дисциплина / В. КовалевЛьготы работающим пенсионерам / З. КошкоСтройотрядовцам / Л. ЧемезоваНа болотной проплешине шара земного… / А. Р. РубанНе видел войны, не знаю… / В. ТюлькинЗа эту легкость мы еще заплатим... / С. БорзуноваПраздник / А. И. КазанцевПремьера оперы / Р. ТомиловаСотрудники открывают сезон / А. Д. МитаенкоЖдем вас, дарящие жизнь / Г. БубеннаяЧП обсуждено, меры приняты / Г. Барченк

Transport and magnetic resonance characteristics of SiO2–γ-Fe2O3 composites obtained by sol gel method

Some electron-transportation and magnetic-resonance characteristics of SiO2–γ-Fe2O3 nanocomposites obtained by sol gel method on dielectric substrates were studied. It is shown that the current-voltage characteristics of the film composite materials are non-linear which is due to the presence of ionic component in the charge transfer mechanism. An increase of the measurement temperature causes their linearization. There were superwide magnetic resonance lines found, the presence of which in the ESR-spectra of the samples is due to the ferromagnetic phase of the composite material

Electric and magnetic properties of nickel and nickel-plladium nanowires deposited in anodic aluminum oxide template

Structure, electric and magnetic properties of ordered Ni and Ni-Pd nanostructures synthesized by means of electrochemical deposition in porous anodic aluminum oxide templates were investigated. Templates were filled with nickel and nickel-palladium compositions using the alternative current. Matrix parameters (pores diameter and depth) determine the sizes and morphology of the formed metal nanowires. Negative sign of magnetoresistance was observed at T 100 K and explained by Lorence-like mechanism. The presence of magnetic perpendicular anisotropy towards template plane in synthesized nanostructures was revealed. Demagnetizing factors of individual nanowire in parallel and perpendicular direction towards template plane were determined by magnetic resonance spectroscopy. Revealed increase of coercivity in nanowires containing palladium was explained by the formation of quasi- multilayered structure of Ni/Pd nanowires during the ac electrochemical deposition.Struktura, właściwości elektryczne i magnetyczne uporządkowanych Ni Ni-Pd nanostruktur syntezowanych metodą elektrochemicznego nanoszenia w porowatej matryce z utlenionego aluminiowego anodu. Matryca została wypełniona Ni lub Ni-Pd mieszanką z wykorzystaniem prądu zmiennego. Parametry matrycy (średnica i głębokość pór) wpływały na rozmiary i morfologię tworzących się metalicznych nanodrutów. Ujemna magnetorezystancja była obserwowana w temperaturze T100K i odpowiada mechanizmowi typu Lorence. Obecność magnetycznej prostopadłej anizotropii w stosunku do płaszczyzny matrycy była zanotowana. Demagnezujący czynnik pojedynczych nanodrutów w kierunkach równoległych i prostopadłych do płaszczyzny matrycy był wyznaczony z badań metodą magnetycznej spektroskopii rezonansowej. Zaobserwowany wzrost komercyjności w nanodrutach zawierających palladium może być związany z formowaniem kwasi-wielowarstwowej struktury w Ni/Pd nanodrutach w trakcie elektrochemicznego osadzenia