vestifmИзвестия Национальной академии наук Беларуси. Серия физико-математических наукProceedings of the National Academy of Sciences of Belarus. Physics and Mathematics Series1561-24302524-2415The Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"10.29235/1561-2430-2019-55-1-118-124vestifm-372Research ArticleФИЗИКАPHYSICSМагнитокалорические свойства кристалла Mn0,99Fe0,01AsMagnetocaloric properties of the single crystal Mn0.99Fe0.01AsГоворГ. А.GovorG. A.

Доктор физико-математических наук, профессор, ведущий научный сотрудник.

 ул. П. Бровки, 19, 220072, г. Минск.

 Dr. Sc. (Physics and Mathematics), Professor, Leading Researcher.

19, P. Brovka Str., 220072, Minsk.

govor@physics.byЛаринА. О.LarinA. O.

Младший научный сотрудник.

 ул. П. Бровки, 19, 220072, г. Минск.

 Junior Researcher.

19, P. Brovka Str., 220072, Minsk.

larin@physics.byМитюкВ. И.MitsiukV. I.

Кандидат физико-математических наук, старший научный сотрудник.

 

Ph. D. (Physics and Mathematics), Senior Researcher.

19, P. Brovka Str., 220072, Minsk.

mitsiuk@physics.byРимскийГ. С.RimskiyG. S.

Аспирант, младший научный сотрудник.

 Postgraduate Student, Junior Researcher.

19, P. Brovka Str., 220072, Minsk.

rimskiy@physics.byТкаченкоТ. М.TkachenkаT. M.

Кандидат физико- математических наук, доцент, доцент кафедры практической подготовки студентов.

пр. Независимости, 99, 220023, г. Минск.

Ph. D. (Physics and Mathematics), Assistant Professor, Assistant Professor of the Depart ment of Practical Training of Students.

99, Nesavisimosti Ave., 220023, Minsk.

oldtaty@bsatu.byНаучно-практический центр Национальной академии наук Беларуси по материаловедению.Scientific-Practical Materials Research Center of the National Academy of Sciences of Belarus.Белорусский государственный аграрный технический университет.Belarusian State Agrarian Technical University.201926032019551118124Copyright © Говор Г.А., Ларин А.О., Митюк В.И., Римский Г.С., Ткаченко Т.М., 20192019Говор Г.А., Ларин А.О., Митюк В.И., Римский Г.С., Ткаченко Т.М.Govor G.A., Larin A.O., Mitsiuk V.I., Rimskiy G.S., Tkachenkа T.M.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://vestifm.belnauka.by/jour/article/view/372

Методом Стокбаргера – Бриджмена были получены монокристаллы Mn0,99Fe0,01As. Исследовано влияние внешнего магнитного поля напряженностью до 10 Тл на фазовые переходы в монокристалле Mn0,99Fe0,01As. Установлено, что магнитоструктурный фазовый переход в Mn0,99Fe0,01As сопровождается изменением энтропии ΔSm, что обусловлено трансформацией кристаллической структуры. При температуре выше температуры магнитоструктурного перехода Tu = 290 К выявлено существование нестабильной магнитной структуры. Магнитокалорические характеристики исследуемого материала определялись косвенным методом расчета на основе термодинамических соотношений Максвелла и уравнения Клапейрона – Клаузиуса.

The Stockbargard – Bridgman method yielded single crystals Mn0.99Fe0.01As. The effect of an external magnetic field with an intensity of up to 10 T on phase transitions in the single crystal Mn0.99Fe0.01As is studied. It is established that the magnetostructural phase transition in Mn0.99Fe0.01As is accompanied by a change in the entropy ΔSm, which is due to the transformation of the crystal structure. At temperatures above the temperature of the magnetostructural transition Tu = 290 K, the existence of an unstable magnetic structure is obtained. The magnetocaloric characteristics of the material under study are determined by an indirect calculation method based on the Maxwell thermodynamic relations and the Clapeyron – Clausius equation.

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The authors declare that there are no conflicts of interest present.