Tuning Martensitic Phase Transition by Non-Magnetic Atom Vacancy in MnCoGe Alloys and Related Giant

• 作 者: 包立夫 黄文登 任亚杰
• 机 构: School of Physics and Telecommunication Engineering,Shaanxi University of Technology,MOE Key Laborat
• 出 处: Chinese Physics Letters
• 发表日期: 2016年07期
• 关键词: Giant tuned martensite transitions hysteresis hexagonal accompanied entropy Curi

The effects of non-magnetic atom vacancy on structural,martensitic phase transitions and the corresponding magnetocaloric effect in MnCoGe_(1-x) alloys are investigated using x-ray diffraction and magnetic measurements.The introduction of non-magnetic atom vacancy leads to the decrease of the martensitic transition temperature and realizes a temperature window where magnetic and martensitic phase transitions can be tuned together.Moreover,the giant magnetocaloric effect accompanied with the coupled magnetic-structural transition is obtained.It is observed that the peak values of magnetic entropy change of MnCoGe_(0.97) are about-13.9,-35.1and-47.4 J·kg~(-1)K~(-1) for △H=2,5,7 T,respectively.

The effects of non-magnetic atom vacancy on structural, martensitic phase transitions and the corresponding magnetocaloric effect in MnCoGe_ (1-x) alloys are investigated using x-ray diffraction and magnetic measurements. Introduction of non-magnetic atom vacancy leads to the decrease of the martensitic transition temperature and realizes a temperature window where magnetic and martensitic phase transitions can be tuned together. Moreover, the giant magnetocaloric effect accompanied with the coupled magnetic-structural transition is obtained. It is observed that the peak values ​​of magnetic entropy change of MnCoGe_ (0.97) are about -13.9, -35.1 and -47.4 J · kg -1 K -1 for △ H = 2,5,7 T, respectively.