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系统研究了铁磁性形状记忆合金Mn2 -xNiGa1+x的结构、磁性和有序化转变. 研究表明: 随着Ga含量的增加, Mn2 -xNiGa1+x的母相结构由Hg2CuTi 型逐渐转变到Cu2MnAl型Heusler结构. 母相的晶格常数先增加后降低, 当x=0.3时达到最大值. 0.3 x 0.8时, 材料除呈现Heusler结构的主相之外, 还出现了Ni2In型六角相. 过渡金属中3d电子之间交换相互作用的减弱, 导致Mn2-xNiGa1+x主相的居里温度由Mn2NiGa的590 K逐渐降低至Ga2MnNi的220 K左右; 当x=0.60.8时, Ni2In型六角相的居里温度与主相的居里温度出现分离. Ga对Mn的替代引起合金中原子间耦合作用的变化, 导致低温下Mn2 -xNiGa1+x的饱和磁化强度先增加后降低, 即x0.4时呈上升趋势, x0.4时急剧下降. 差热分析结果显示, 随着x从0增加到1, 样品熔化温度逐渐降低, B2相到Heusler相的转变温度先降低后增加.The structure magnetism and ordering transition of the ferromagnetic shape memory alloy Mn2 -xNiGa1+xhave been systematically studied in this paper. With increasing Ga content, the structure of the parent phase Mn2 -xNiGa1+x is transformed from Hg2CuTi-type to Cu2MnAl-type Heusler alloy gradually. Its lattice constant increases first and then decreases, reaching its maximum at x=0.3. The sample displays both the primary phase of Heusler and the Ni2In-type hexagonal phase in precipitate form when x lies in the range of 0.3-0.8. The Curie temperature of the primary phase of Heusler alloy Mn2 -xNiGa1+x reduces gradually from 590 K for Mn2NiGa to about 220 K for Ga2MnNi with the decrease of the exchange interaction between 3d electrons in the transition metals. However, the variation of Curie temperature of Ni2In-type hexagonal phase is gentle. The separation of Curie temperatures between the Ni2In-type hexagonal phase and the primary phase of Heusler occurs when x lies in the range from 0.6 to 0.8. Substitution of Mn by Ga has a significant influence on the coupling interaction among various atoms, leading to first increasing and then decreasing of the saturated magnetization of Mn2 -xNiGa1+x at low temperatures. That is, the saturated magnetization will rise for x0.4 and drops sharply for x0.4. Results of differential scanning calorimeter show that the melting temperature decreases gradually as x increases. Meanwhile, the transition temperature from parent phase (B2) to Heusler phase decreases first and increases later.
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Keywords:
- ferromagnetic shape memory alloys /
- structural transition /
- magnetism /
- MnNiGa
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[1] Ullakko K, Huang J, Kantner C, O'handley R, Kokorin V 1996 Appl. Phys. Lett. 69 1966
[2] Vasil'ev A, Bozhko A, Khovailo V, Dikshtein I, Shavrov V, Buchelnikov V, Matsumoto M, Suzuki S, Takagi T, Tani J 1999 Phys. Rev. B 59 1113
[3] Wu G, Yu C, Meng L, Chen J, Yang F, Qi S, Zhan W, Wang Z, Zheng Y, Zhao L 1999 Appl. Phys. Lett. 75 2990
[4] Murray S J, Marioni M, Allen S, O'handley R, Lograsso T 2000 Appl. Phys. Lett. 77 886
[5] Liu Z, Zhang M, Wang W, Wang W, Chen J, Wu G, Meng F, Liu H, Liu B, Qu J, Li Y 2002 J. Appl. Phys. 92 5006
[6] Enkovaara J, Heczko O, Ayuela A, Nieminen R 2003 Phys. Rev. B 67 212405
[7] Khovailo V V, Oikawa K, Abe T, Takagi T 2003 J. Appl. Phys. 93 8483
[8] Jin X, Marioni M, Bono D, Allen S, O'Handley R, Hsu T 2002 J. Appl. Phys. 91 8222
[9] Liu G, Chen J, Liu Z, Dai X, Wu G, Zhang B, Zhang X 2005 Appl. Phys. Lett. 87 262504
[10] Barman S, Chakrabarti A 2008 Phys. Rev. B 77 176401
[11] Liu G, Dai X, Yu S, Zhu Z, Chen J, Wu G, Zhu H, Xiao J Q 2006 Phys. Rev. B 74 054435
[12] Barman S, Banik S, Shukla A, Kamal C, Chakrabarti A 2007 Europhys. Lett. 80 57002
[13] Singh S, Maniraj M, D'Souza S, Ranjan R, Barman S 2010 Appl. Phys. Lett. 96 081904
[14] Ma L, Zhang H, Yu S, Zhu Z, Chen J, Wu G, Liu H, Qu J, Li Y 2008 Appl. Phys. Lett. 92 032509
[15] Liu G D, Wang X Q, Dai X F, Liu Z H, Yu S Y, Chen J L, Wu G H 2006 Acta Phys. Sin. 55 4883 (in Chinese) [刘国栋, 王新强, 代学芳, 柳祝红, 于淑云, 陈京兰, 吴光恒 2006 55 4883]
[16] Cai W, Zhang J, Gao Z Y, Sui J H, Dong G F 2011 Acta Mater. 59 2358
[17] Wang D H, Han Z D, Xuan H C, Ma S C, Chen S Y, Zhang C L, Du Y W 2013 Chin. Phys. B 22 077506
[18] Tan C L, Zhang K, Tian X H, Cai W 2015 Chin. Phys. B 24 057502
[19] Dong G F, Gao Z Y 2016 J. Magn. Magn. Mater. 399 185
[20] Barman S, Chakrabarti A, Singh S, Banik S, Bhardwaj S, Paulose P, Chalke B, Panda A, Mitra A, Awasthi A 2008 Phys. Rev. B 78 134406
[21] Singh S, Bhardwaj S, Panda A, Ahire V, Mitra A, Awasthi A, Barman S 2010 Mater. Sci. Forum 635 43
[22] Singh S, Rawat R, Barman S 2011 Appl. Phys. Lett. 99 021902
[23] Liu J, Scheerbaum N, Hinz D, Gutfleisch O 2008 Acta Mater. 56 3177
[24] Song R N, Zhu W, Liu N K, Li G J, Chen J L, Wang W H, Li X, Wu G H 2012 Acta Phys. Sin. 61 027501 (in Chinese) [宋瑞宁, 朱伟, 刘恩克, 李贵江, 陈京兰, 王文洪, 李祥, 吴光恒 2012 61 027501]
[25] Li G T, Liu Z H, Ma X Q, Yu S Y, Liu Y 2013 Mater. Lett. 107 239
[26] Liu E K, Wang W H, Feng L, Zhu W, Li G J, Chen J L, Zhang H W, Wu G H, Jiang C B, Xu H B, de Boer F 2012 Nat. Commun. 3 873
[27] Wei Z Y, Liu E K, Li Y, Xu G Z, Zhang X M, Liu G D, Xi X K, Zhang H W, Wang W H, Wu G H, Zhang X X 2015 Adv. Electron. Mater. 1 1500076
[28] Li G, Liu E, Zhang H, Qian J, Zhang H, Chen J, Wang W, Wu G 2012 Appl. Phys. Lett. 101 102402
[29] Webster P J 1969 Contemp. Phys. 10 559
[30] Feng Y, Rhee J Y, Wiener T A, Lynch D W, Hubbard B E, Sievers A J, Schlagel D L, Lograsso T A, Miller L L 2001 Phys. Rev. B 63 165109
[31] Zhang Y, Li G, Liu E, Chen J, Wang W, Wu G 2013 J. Appl. Phys. 113 123901
[32] Jaggi N K, Rao K R P M, Grover A K, Gupta L C, Vijayaraghavan R, Le Dang K 1978 Hyperfine Interact. 4 402
[33] Barth J, Balke B, Fecher G H, Stryhanyuk H, Gloskovskii A, Naghavi S, Felser C 2009 J. Phys. D: Appl. Phys. 42 185401
[34] Ma L, Wang W, Zhen C, Hou D, Tang X, Liu E, Wu G 2011 Phys. Rev. B 84 224404
[35] Stearns M B 1979 J. Appl. Phys. 50 2060
[36] Liu Z H, Yi B, Li G T, Ma X Q 2012 Acta Phys. Sin. 61 108104 (in Chinese) [柳祝红, 伊比, 李歌天, 马星桥 2012 61 108104]
[37] Varaprasad B S D C S, Rajanikanth A, Takahashi Y K, Hono K 2009 Acta Mater. 57 2702
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