Structural studies of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Ni</mml:mi><mml:mrow><mml:mn>2</mml:mn><mml:mo>+</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">Mn</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:mi mathvariant="normal">Ga</mml:mi></mml:mrow></mml:math>by powder x-ray diffraction and total energy calculations

Banik, Soma; Ranjan, Rajeev; Chakrabarti, Aparna; Bhardwaj, S.; Lalla, N. P.; Awasthi, A. M.; Sathe, Vasant; Phase, D. M.; Mukhopadhyay, P.K.; Pandey, Dhananjai; Barman, Sudipta Roy

doi:10.1103/physrevb.75.104107

Cited by 93 publications

(47 citation statements)

References 44 publications

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“…This might be due to structural disorder which are not accounted for in the theoretical calculation. The difference in the lattice parameters by GGA based DFT and the experiment has been also reported for Ni-Mn-Ga system [18]. Moreover, one finds a reduction in some of the Ni-Mn bond lengths.…”

Section: Resultssupporting

confidence: 58%

Driving force for martensitic transformation inNi2Mn1+xSn1−x

et al. 2016

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The martensitic transformation in Ni 2 Mn 1+x Sn 1−x alloys has been investigated within ab-initio density functional theory. The experimental trend of a martensitic transition happening beyond x = 0.36 is captured within these calculations. The microscopic considerations leading to this are traced to increased Ni-Mn hybridization which results from the Ni atom experiencing a resultant force along a lattice parameter and moving towards the Mn atoms above a critical concentration.The presence of the lone pair electrons on Sn forces the movement of Ni atoms away from Sn.While band Jahn Teller effects have been associated with this transition, we show quantitatively that atleast in this class of compounds they have a minor role.

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Section: Resultssupporting

confidence: 58%

Driving force for martensitic transformation inNi2Mn1+xSn1−x

et al. 2016

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“…23. Similar trend is obtained for Ni excess Ni-Mn-Ga. 21,24,28 In Fig. 2b, T M versus δE tot for all the shape memory alloys discussed above are plotted;…”

Section: Resultsmentioning

confidence: 99%

“…The latent heat of the transition turns out to be about 2.35 KJoule/mole, which is similar to that reported for Ni excess Ni-Mn-Ga, for example, Ni 2. 24 Mn 0.75 Ga. 28 The difference in the width of the heating and cooling thermograms could be related to the kinetics of the structural transition. EDAX measurements from different regions of 30µ×30µ area as well as the back scattered image show that the specimen is homogeneous.…”

Section: B Experimental Studiesmentioning

confidence: 99%

Theoretical prediction and experimental study of a ferromagnetic shape memory alloy:Ga2MnNi

et al. 2008

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We predict the existence of a new ferromagnetic shape memory alloy Ga 2 MnNi using density functional theory. The martensitic start temperature (T M ) is found to be approximately proportional to the stabilization energy of the martensitic phase (δE tot ) for different shape memory alloys. Experimental studies performed to verify the theoretical results show that Ga 2 MnNi is ferromagnetic at room temperature and the T M and T C are 780 K and 330 K, respectively. Both from theory and experiment, the martensitic transition is found to be volume conserving that is indicative of shape memory behavior.

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“…Nevertheless, the occurrence of a premartensitic phase is not yet a well understood phenomenon, as it only has been observed for a restricted number of magnetic shape memory alloys within limited composition ranges. Actually, the study of the structural (martensitic and premartensitic transformations) and magnetic properties of Ni-Mn-Ga alloys is a current topic of intense research [12,13,14,15,16,17,18].…”

Section: Introductionmentioning

confidence: 99%

Phase diagram of Fe-doped Ni-Mn-Ga ferromagnetic shape-memory alloys

et al. 2008

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We have studied the effect of Fe addition on the structural and magnetic transitions in the magnetic shape memory alloy Ni-Mn-Ga by substituting systematically each atomic species by Fe. Calorimetric and AC susceptibility measurements have been carried out in order to study the magnetic and structural transformation properties. We find that the addition of Fe modifies the structural and magnetic transformation temperatures. Magnetic transition temperatures are displaced to higher values when Fe is substituted into Ni-Mn-Ga, while martensitic and premartensitic transformation temperatures shift to lower values. Moreover, it has been found that the electron per atom concentration essentially governs the phase stability in the quaternary system. However, the observed scaling of transition temperatures with e/a differs from that reported in the related ternary system Ni-Mn-Ga.

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Structural studies ofNi2+xMn1−xGaby powder x-ray diffraction and total energy calculations

Cited by 93 publications

References 44 publications

Driving force for martensitic transformation inNi2Mn1+xSn1−x

Driving force for martensitic transformation inNi2Mn1+xSn1−x

Theoretical prediction and experimental study of a ferromagnetic shape memory alloy:Ga2MnNi

Phase diagram of Fe-doped Ni-Mn-Ga ferromagnetic shape-memory alloys

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