Crystal structures of modulated martensitic phases of FSM Heusler alloys

被引：20

作者：

Righi L. ^{[1
]}

Albertini F. ^{[2
]}

Fabbrici S. ^{[2
]}

Paoluzi A. ^{[2
]}

机构：

[1] Dipartimento di Chimica Generale ed Inorganica, Chimica Analitica, Chimica Fisica, Università di Parma, I-43124 Parma

[2] IMEM, Consiglio Nazionale delle Ricerche, I-43124 Parma

来源：

Materials Science Forum | 2011年 / 684卷

关键词：

Incommensurate modulation; Martensitic structure; Powder diffraction;

D O I：

10.4028/www.scientific.net/MSF.684.105

中图分类号：

学科分类号：

摘要：

Multifunctional ferromagnetic shape memory Heusler alloys are frequently characterized by structural modulation in martensitic phases. In particular, modulated martensitic phases, showing the higher magnetic field induced strain (MFIS) performance, are the most promising candidates for technological applications. Depending on the composition, as well as pressure and temperature conditions, this periodic structural distortion, consisting of shuffling of atomic layers along defined crystallographic directions, accompanies the martensitic transformation. Over the years, different Ni-Mn-Ga modulated martensitic structures have been observed and classified depending upon the periodicity of corresponding ideal nM superstructure (where n indicates the number of basic unit cells constituting the superlattices). On the other hand, it has been demonstrated that in most cases such structural modulation is incommensurate and the crystal structure has been fully determined by applying superspace formalism. The results, obtained by structure refinements on powder diffraction data, suggest a unified crystallographic description of the modulated martensitic structures, here presented, where every different "nM" periodicity can be straightforwardly represented. © (2011) Trans Tech Publications, Switzerland.

引用

页码：105 / 116

页数：11

共 38 条

[1]

Chernenko V.A., Advances in shape memory materials, Materials Science Forum, 583, (2008)

[2]

O'Handley R.C., J. Appl. Phys., 83, (1998)

[3]

Pareti L., Solzi M., Albertini F., Paoluzi A., Eur. Phys. J. B, 32, (2003)

[4]

Chernenko V.A., Cesari E., Kokorin V.V., Vitenko I.N., Scripta Metall. Mater., 33, (1995)

[5]

Webster P.J., Ziebeck K.R.A., Town S.L., Peak M.S., Phil. Mag., B49, (1984)

[6]

Martynov V.V., Kokorin V.V., Journ. de Phys. III, 2, (1992)

[7]

Martynov V.V., J. de Phys. IV, C8, (1995)

[8]

Pons J., Chernenko V.A., Santamarta R., Cesari E., Acta Mater., 48, (2000)

[9]

Morito S., Otsuka K., Mater. Sci. Eng. A, 208, (1996)

[10]

Hwang C.M., Meichle M., Salamon M.B., Wayman C.M., Phil. Mag. A., 9, (1983)

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