The influence of boron addtion on structural, magnetic and thermoelectric properties of Ni2Mn1.52Sb0.48Bx

Ngo Van Nong, Thanh Hung Le, Luu Tuan Tai

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Abstract

Heusler alloys known as X2YZ (full­-Heusler) and XYZ (half-­Hersler), where X and Y denote the transition metals and X is s-­p such as Al, Ga, Sb, Sn, In, ect., have been extensively studied since they possess many important properties [1-­3] like shape memory effect, magnetocaloric effect (MCE), magnetoresistance and thermoelectric effect. In this work, structure, magnetic and thermoelectric properties of the full­-Hersler Ni2Mn1.52Sb0.48 alloy were investigated in terms of Boron (B) addition. We have found that the structural transition temperature i.e. the ferromagnetic­to­antiferromagnetic martensitic transition (TM) decreases, while the paramagnetic­ferromagnetic austenitic transition (TC) tends to increase with increasing B concentration. Temperature dependent X­ray diffraction patterns from 200 ­- 500 K clearly shows an evolution of the structural transformation from orthorhombic to cubic structure. It was interestingly found in the high­temperature (300 -­ 1000 K) thermoelectric properties, that the sample with x = 1 switches from -type conducting behavior at temperatures below 570 K to p-­type conducting one in higher temperature region. However, with higher B concentration e.g. x = 2, the sample shows n-­type conducting behavior over the whole measured temperature range, again confirming the effect of boron addition.

Original languageEnglish
Publication date2012
Publication statusPublished - 2012
Event6th International Workshop on Advanced Materials Science and Nanotechnology - Bai Chay, Ha Long City, Viet Nam
Duration: 30 Oct 20122 Nov 2012
Conference number: 6
http://iwamsn2012.ac.vn/

Workshop

Workshop6th International Workshop on Advanced Materials Science and Nanotechnology
Number6
LocationBai Chay
Country/TerritoryViet Nam
CityHa Long City
Period30/10/201202/11/2012
Internet address

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