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Incommensurate and commensurate structural modulation in martensitic phases of FSMA (Articolo in rivista)

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Incommensurate and commensurate structural modulation in martensitic phases of FSMA (Articolo in rivista) (literal)

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Righi L.; Albertini F.; Paoluzi A.; Fabbrici S.; Villa E.; Calestani G.; Besseghini S. (2010)
Incommensurate and commensurate structural modulation in martensitic phases of FSMA
in Materials science forum; TRANS TECH PUBLICATIONS LTD, LAUBLSRUTISTR 24, CH-8717 STAFA-ZURICH (Svizzera)
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Righi L.; Albertini F.; Paoluzi A.; Fabbrici S.; Villa E.; Calestani G.; Besseghini S. (literal)

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FERROMAGNETIC SHAPE MEMORY ALLOYS II - Book Series: Materials Science Forum -Volume: 635 -Pages: 33-41 DOI: 10.4028/www.scientific.net/MSF.635.33 Published: 2010 Conference: 2nd International Conference on Ferromagnetic Shape Memory Alloys, ICFSMA2009; Bilbao; Spain; 1 July 2009 through 3 July 2009; Code 79240 (literal)

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In: Ferromagnetic Shape Memory Alloys II. pp. 33 - 41. Chernenko V.A (ed.). (Materials Science Forum, vol. 635). Switzerland: Trans Tech Publication TTP, 2010. (literal)

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1,6 : Dipartimento di Chimica Generale ed Inorganica, Chimica Analitica, Chimica Fisica, Università di Parma, Viale G. Usberti 17/A, I-43100 Parma, Italy / 2,3,4 : IMEM, Consiglio Nazionale delle Ricerche, Parco Area delle Scienze 37/A, I-43010 Parma, Italy / 5,7 : IENI, Consiglio Nazionale delle Ricerche, Corso Promessi Sposi, 23900 Lecco, Italy (literal)

Titolo

Incommensurate and commensurate structural modulation in martensitic phases of FSMA (literal)

Abstract

Magnetic and structural properties in multifunctional FSMA (Ferromagnetic Shape Memory Alloys) belonging to Heusler family are frequently related to the occurrence of structural modulation in martensitic phases. The highest MFIS (Magnetic Field Induced Strain) effect has been observed in Ni-Mn-Ga alloys showing martensitic modulated structures. Depending on the composition, pressure and temperature conditions, this periodic structural distortion, consisting of shuffling of atomic layers along specific crystallographic directions, accompanies the martensitic transformation. Over the years, different modulated martensitic structures have been observed and classified depending upon the periodicity of corresponding superstructure (nM with n=3, 5, 6, 7, 12 etc). On the other hand, it has been demonstrated that in most cases such structural modulation is incommensurate and the crystal structure can be solved by applying superspace approach. The crystallographic representation of different modulated structures, obtained by structure refinement on powder diffraction data, suggests a unified description where every different \"nM\" periodicity can be straightforwardly represented. It will be presented an overview illustrating structural features of several displacive modulated martensitic lattices. For a specific Ni-Mn-Ga composition, the evolution of structural modulation upon temperature change will be illustrated. (literal)

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