Neutron Diffraction Investigations on Quenched MnBi and MnBi(0.9)Sb(0.1).

Andresen, Arne F.; Engebretsen, Jan E.; Refsnes, J.; Huhtikangas, Aarre; Pearson, W. B.; Meisalo, Veijo

doi:10.3891/acta.chem.scand.26-0175

Cited by 41 publications

(23 citation statements)

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“…This is equivalent to 4.18, 4.24, 3.84, and 3.56 l B per Mn-Bi pair at these temperatures. The result agrees with Anderson's 1972 data (4.18 l B at 10 K) 13 and is in close agreement with Yang's 2011 data (4.23, 4.1, 3.7, and 3.55 l B at 10, 100, 300, and 400 K, respectively). 3 …”

Section: Resultssupporting

confidence: 91%

Development of MnBi permanent magnet: Neutron diffraction of MnBi powder

Cui

Choi

et al. 2014

Journal of Applied Physics

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MnBi attracts great attention in recent years for its great potential as permanent magnetmaterials. MnBi phase is difficult to obtain because of the rather drastic peritectic reaction between Mn and Bi. In this paper, we report our effort on synthesizing high purity MnBi compound using conventional powder metallurgical approaches. Neutron diffraction was carried out to investigate the crystal and nuclear structure of the obtained powder. The result shows that the purity of the obtained powder is about 91 wt. % at 300 K, and the magnetic moment of the Mn atom in MnBi lattice is 4.424 and 4.013 μ B at 50 K and 300 K, respectively. MnBi attracts great attention in recent years for its great potential as permanent magnet materials. MnBi phase is difficult to obtain because of the rather drastic peritectic reaction between Mn and Bi. In this paper, we report our effort on synthesizing high purity MnBi compound using conventional powder metallurgical approaches. Neutron diffraction was carried out to investigate the crystal and nuclear structure of the obtained powder. The result shows that the purity of the obtained powder is about 91 wt. % at 300 K, and the magnetic moment of the Mn atom in MnBi lattice is 4.424 and 4.013 l B at 50 K and 300 K, respectively. V C 2014 AIP Publishing LLC.

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Section: Resultssupporting

confidence: 91%

Development of MnBi permanent magnet: Neutron diffraction of MnBi powder

Cui

Choi

et al. 2014

Journal of Applied Physics

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“…[7][8][9] Many efforts have been made to produce single phase MnBi. [7][8][9][10][11][12][13][14][15] At present, no single phase MnBi has been prepared by sintering Mn and Bi powders.…”

Section: Introductionmentioning

confidence: 99%

Structure and magnetic properties of the MnBi low temperature phase

Yang

Yelon

James

et al. 2002

Journal of Applied Physics

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High purity MnBi low temperature phase has been prepared and analyzed using magnetic measurements and neutron diffraction. The low-temperature phase of the MnBi alloy has a coercivity μ0iHc of 2.0 T at 400 K, and exhibits a positive temperature coefficient from 0 to at least 400 K. The neutron data refinement indicated that the Mn atom changes its spin direction from c axis above room temperature to nearly perpendicular to the c axis at 50 K. A canted magnetic structure has been observed below 200 K. The anisotropy field increases with increasing temperature which gives rise to a high coercivity at the higher temperatures. The anisotropic bonded magnets have maximum energy products (BH)max of 7.7 and 4.6 MGOe at room temperature and 400 K, respectively.

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“…MnBi has been reported to crystallize in an orthorhombic arrangement. Only X-ray powder data are available and in the two studies found (G6bel et aL, 1976;Andresen et al, 1972) all atomic positions are partially occupied, some to more than 100%! The Fe-Ge system contains a complex B8 region; Fe2Ge is reported as simple Ni2ln by Kim & Kang (1989), Fe3Ge2 has been reported as a badly disordered type structure of its own (Malaman et aL, 1980) and as the Pd13TI9 structure (Panday & Schubert, 1969), FesGe3 has been ascribed a simple Ni2In-type structure, either by disordered partial occupancy of the 2(d) position (Kanematsu et al, 1963) or by total disordering of all constituent atoms (Castelliz, 1953;Bara et al, 1981); Fe13Ge8 is a structure type of its own (Malaman et aL, 1980).…”

Section: Referencementioning

confidence: 99%