12228-50-1Relevant academic research and scientific papers
Investigating Robust Honeycomb Borophenes Sandwiching Manganese Layers in Manganese Diboride
Ma, Shuailing,Bao, Kuo,Tao, Qiang,Xu, Chunhong,Feng, Xiaokang,Zhu, Pinwen,Cui, Tian
, p. 11140 - 11146 (2016)
We report a robust honeycomb boron layers sandwiching manganese layers compound, MnB2, synthesized by high pressure and high temperature. First-principle calculation combined with X-ray photoelectron spectrum unravel that the honeycomb boron structure was stabilized by filling the empty π-band via grabbing electrons from manganese layers. Honeycomb boron layers sandwiching manganese layers is an extraordinary prototype of this type of sandwiched structure exhibiting electronic conductivity and ferromagnetism. Hydrostatic compression of the crystal structure, thermal expansion, and the hardness testing reveal that the crystal structure is of strong anisotropy. The strong anisotropy and first-principle calculation suggests that B-B bonds in the honeycomb boron structure are a strong directional covalent feature, while the Mn-B bonds are soft ionic nature. Sandwiching honeycomb boron layers with manganese layers that combine p-block elements with magnetic transition metal elements could endow its novel physical and chemical properties.
THERMAL EXPANSION STUDIES ON THE GROUP IV-VII TRANSITION METAL DIBORIDES.
Loennberg
, p. 145 - 156 (2008/10/08)
The thermal expansions of the group IV-VII transition metal diborides were studied with the aid of X-ray powder diffraction. The diborides were studied over the temperature range 298 - 1500 K. All the diborides except for CrB//2 display larger thermal expansion coefficients in the c direction than in the a direction. The expansion coefficients in the c direction decrease with increasing radius of the metal atom, a fact which can be correlated to an increase in metal-boron bond strength. The thermal expansion coefficient in the a direction changes very little with the size of the metal radius, owing to the fact that the bonding strength in the basal plane is determined by the strong B-B bonds within the boron layer.
ORIENTATION OF THE EASY DIRECTIONS AND AXIS OF ANTIFERROMAGNETISM IN A SINGLE CRYSTAL OF MnB2.
Vlasov,Timoshchuk,Tkach,Romanov
, p. 49 - 53 (2008/10/08)
On single crystals possessing hexagonal symmetry and an antiferromagnetism-weak ferromagnetism phase transition, anisotropy of the magnetization is investigated under a magnetic field together with magnetization curves in the antiferromagnetic and ferrimagnetic states.
MAGNETORESISTANCE AND THE MAGNETIC PROPERTIES OF MnB2.
Vlasov,Sokhareva,Timoshchuk
, p. 89 - 94 (2008/10/08)
Temperature dependencies of the magnetization, susceptibility and magnetoresistance are measured. The magnetoresistance is negative. The temperature curve had a minimum at the point of low-temperature magnetic phase transition from antiferromagnetic to a weakly ferromagnetic state (T less than T//c). The results explain the nature of this transition and support of the s-d exchange model.
