A New Kind of Functional Crystal Ni2MnGa

Journal of Inorganic Materials

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A New Kind of Functional Crystal Ni₂MnGa

LIU Yan¹; JIANG Bo-Hong²; ZHOU Wei-Min²; WANG Jin-Chang¹; FENG Chu-De¹; XIE Hua-Qing¹; NI Pei-Wen¹

1.Shanghai Institute of Ceramics; Chinese Academy of Sciences; Shanghai 200050; China;2. ShanghaiJiaoTong University; Shanghai 200030; China

Received:1999-12-23 Revised:2000-01-17 Published:2000-12-20 Online:2000-12-20

Abstract

Abstract: Ni₂MnGa crystal is a new kind of functional material, which exhibits ferromagnetic, magnetostrictive, thermal and magnetically
controlled shape memory properties. The nonstoichiometric Ni₂MnGa crystal can show a strain of 0.31% along [001] direction in a magnetic field of 6kOe
at room temperature; a [001]-directed stress of only 2MPa gives rise to a recoverable strain of 5%. As a kind of future actuator and sensor material, it will
possibly be used in many fields, such as sonar, microactuator, linear motor, microwave device, vibration and noise control, robot and functional structure etc. This paper
presents the properties of Ni₂MnGa crystal, the essential and mechanism of the magnetic-induced martensitic transformation and magnetically controlled shape memory
effect. Some factors which may influence the properties of Ni₂MnGa are also discussed.

Key words: Ni₂MnGa, magnetic-field-induced strain, magnets-shape-memory effect, magnetostrictive, martensitic transformation

CLC Number:

O73
TB381

LIU Yan,JIANG Bo-Hong,ZHOU Wei-Min,WANG Jin-Chang,FENG Chu-De,XIE Hua-Qing,NI Pei-Wen. A New Kind of Functional Crystal Ni₂MnGa[J]. Journal of Inorganic Materials.

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A New Kind of Functional Crystal Ni₂MnGa

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