Browsing by Author "Liangzi Deng"

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An experimental and theoretical investigation on structure-property correlation of Cu2Mn1Al1−xGax full-Heusler alloy
(Elsevier Ltd, 2022) Shashank Shekhar Mishra; Anurag Bajpai; Thakur Prasad Yadav; Ram Manohar Yadav; Anand B. Puthirath; Liangzi Deng; Moein Adnani; Ching-Wu Chu; Robert Vajtai; Pulickel M. Ajayan; Krishanu Biswas; Nilay Krishna Mukhopadhyay
The present study reports the evolution of microstructure and magnetic properties of Cu2MnAl1−xGax Heusler alloys. The L21 phase, which remained stable up to a Ga substitution of x = 0.3, transformed into mixed phases, i.e., hexagonal close packed (HCP) and complex cubic structure (CCS) on further addition of Ga. The non-monotonic increase in the lattice constant indicates that some amount of Ga retains its monovalent state. The magnetic phase showed a transition from ferromagnetic to paramagnetic state with increasing Ga concentration. The re-entrant temperature (TR) decreased from 8.2 K to 5.2 K as Ga content increased from 5 at% to 10 at%. The strength of magnetic exchange-coupling also reduced with an increase in Ga content. Gaussian process regression (GPR) was used to estimate the lattice parameter using the ionic radii and Pauling electronegativity of the constituents. The modeling approach showed high accuracy and stability, providing new insights into future alloy development. © 2021 Elsevier B.V.
Effect of Ga substitution on structural and magnetic properties of Fe50Mn25Al25-xGax Heusler alloys
(Elsevier Ltd, 2021) S.S. Mishra; T.P. Yadav; Ram Manohar Yadav; Anand B. Puthirath; Liangzi Deng; Moein Adnani; Ching-Wu Chu; Robert Vajtai; P.M. Ajayan; Krishanu Biswas; N.K. Mukhopadhyay; O.N. Srivastava
Heusler alloys possess the structure of an ordered compound while displaying most of the properties of metals. Numerous magnetic exchange mechanisms may be operating in such systems. Herein, the structural and magnetic properties have been investigated as a function of substitution of Al by Ga in Fe50Mn25Al25-xGax (x = 0, 2.5, 5.0, 7.5, 10.0) quaternary (pseudo-ternary) full Heusler alloys. The X-ray diffraction analysis confirms the substituting Al by Ga promoting the lattice expansion in the L21 crystal structure in Fe50Mn25Al25-xGax alloys. The line scanning profile using energy dispersive X-ray analysis investigations suggests the homogeneous distribution of Ga in all the alloys. The magnetic moment of the alloys was found to be affected by Ga as the antiferromagnetic counterpart increases with Ga. A decrease in the value of Curie temperature was found with increase in Ga content. A second-order magnetic phase transition was observed in the alloys above room temperature. © 2020 Elsevier B.V.