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Information × Registration Number 0211U006689, 0109U006361 , R & D reports Title Induced external influences (electric and magnetic fields, pressure, temperature) phase transformations into alloys of transitive metals. popup.stage_title Head Valkov Victor Ivanovich, Registration Date 10-03-2011 Organization Donetsk Institute of Physics @ Engineering named after O.O.Galkin NAS of Ukraine popup.description2 On the first stage of research work was studied magnetocaloric iron-manganese pnictides with the purpose of determination of terms origin current stimulation of transitions of the first order, which are accompanied by hysteresis of volt- ampere description. It is set that in alloys the current stimulation transitions of the first order on nanocontacts with metallic character of conductivity will be realized only in case that spontaneous magnetic phase transitions are accompanied by a considerable magneto-resistive anomaly. It is supposed that current stimulation transitions, related to stabilizing of the supercooled capacitance-resistance state of antiferromagnetic phase of Mn1.3Fe0.7(AsP)0.5, id est that state which it had, if at Т=Тdіs passing did not take place to the low-resistance phase, when the spontaneous origin of phase does not take place with an uncompensated magnetic moment. Research of magnetic properties of alloys of the systems is conducted on a base MnAs, in particular Mn(1-t)Cr(t)As (0.1<t<<0.3) at hydrostatical pressure to 10 kbar and quasihydrostatical pressure to 30 kbar in the interval of temperatures 4.2370 K. For the study of behavior of magnetized depending on a temperature and magnetic-field for the action of pressure original methodology and equipment (container high-pressure type piston-cylinder or anvils) are used. On results measuring a magnetic phase diagram which determines the areas of existence of different well-organized phases is built, including a phase high-pressure, which possesses a spontaneous magnetic moment and characteristic for orthorhombic MnAs. Drawn conclusion about contradiction of present data which touch the magnetic structure of this phase and necessity of further researches for her removal. Product Description popup.authors Головчан Олексій Віталійович Грибанов Ігор Федорович Дворніков Євген Олександрович Каменєв Віктор Іванович Сіваченко Олександр Павлович Таренков Володимир Юрійович Тодрис Боріс Михайлович popup.nrat_date 2020-04-02 Close