The acoustical investigations of a Ni53Mn25Ga22 Heysler alloy ferromagnet crystal

Vasiliy D. Buchelnikov 1V V. Koledov 2Dmitriy A. Kostiuk 3Yuri A. Kuzavko 4Vladimir V. Khovailo 2Vladimir G. Shavrov 2

1. Chelyabinsk State University (ChelSU), Br. Kashirinykh Str, 129, Chelyabinsk 454021, Russian Federation
2. Institute of Radio Engineering and Electronics RAS (IRE RAS), Mokhovaya, 11, Moscow 125009, Russian Federation
3. Brest State Technical University, Brest 224017, Belarus
4. The Polesie Agrarian Ecological Institute of the National Academy of Science of Belarus (PAEI), Brest 224000, Belarus

Abstract

Some metal alloys have reversible thermoelastic martensite transitions with shape memory effects (SME). SME coupled with a reversible transitions from a deformed martensite phaseinto the high-temperature austenitic ones. Ferromagnetic crystal of Ni53Mn25Ga22 Heysler alloy (austenite starting temperature As=1160C and finishing one Af=1340C, martensite starting temperature Ms=1090C and finishing one Mf=970C, Curie temperature Tc=1340C) with a coupled magnetostructural transithions [1]allowes to get the decrease of a magnetic field magnitude, to controll the reversible change of the sample dimensions (4x4x10 mm sample in our case). For our crystal of Ni53Mn25Ga22 the lattice parameters a=b=0.7753 nm, c=0.6598 nm, as for Ni2MnGa a=b=0.5920 nm, c=0.5566 nm at D4hphase, a=0.5825 nm at Oh. The investigations of SME are aimed to combine rapid response with large reversible deformations. The decrease of a magnetic field magnitude for a controlled SME is a common problem for a wide engineering applications of such materials.

The presence of a soft acoustical transverse mode TA2with k=(1/3, 1/3, 0) wave vector and [110] polarization takes place for Heysler alloys. It is related with accession to zero of the elastic constant c'=(c11-c12)/2 [2].

The sample was temperature-controlled in experiment. The accuracy of measuring was 0.025 К, the minimal speed of heating - 1 К / 3 min., the sample was placed in constant magnet of 2 kOe at necessity. All five characterizing temperatures of crystal were definable from acoustical measuring.

Authors are grateful for BRFFI and RFFI (F04R-080, 04-02-81058 grants) and ME RB (grant 05-505) for their financial support of carried out researches.

1. C. Jiang, G. Feng, H. Xu. Appl. Phys. Lett. 2002. V.80. pp. 1619-1621.

2. T.E. Stenger, J. Trivisonno. Phyics. Rev.B 1998. V. 57. pp. 2735-2739.

 

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Presentation: Oral at E-MRS Fall Meeting 2007, Symposium E, by Yuri A. Kuzavko
See On-line Journal of E-MRS Fall Meeting 2007

Submitted: 2007-05-14 23:43
Revised:   2009-06-07 00:44