Synthesis and Characterization of the Manganese Borate α-MnB₂O₄

Abstract

The high-pressure manganese borate α-MnB 2 O 4 was synthesized under high-pressure/hightemperature conditions of 6.5 GPa and 1100 • C in a modified Walker-type multianvil apparatus. The monoclinic compound is isotypic to α-FeB 2 O 4 , CaAl 2 O 4 -II, CaGa 2 O 4 , and β -SrGa 2 O 4 crystallizing with eight formula units in the space group P2 1 /c (Z = 8) with the lattice parameters a = 712.1(2), b = 747.1(2), c = 878.8(2) pm, β = 94.1(1) • , V = 0.466(1) nm 3 , R 1 = 0.0326, and wR 2 = 0.0652 (all data). The compound is built up from layers of "sechser" rings of corner-sharing BO 4 tetrahedra that are interconnected to a three-dimensional network. The manganese ions are coordinated by seven oxygen atoms and situated in channels along the a axis.

Structure and Properties of the Non‐Centrosymmetric Manganese(II) Borate Mn5(BO3)3OH

“…Mn5 possesses a 6+1 coordination and can be regarded as a capped octahedron ( d (Mn5 CN=6 –O): 227.9 pm; Mn5–O9: 260.9(3) pm). The resulting average Mn5 CN=6+1 –O bond length in the MnO 5 (OH) 2 polyhedra of 231.6 pm is similar to the values for the seven‐fold coordinated Mn 2+ ions in α ‐MnB 2 O 4 (227.9 and 233.4 pm). These polyhedra build up a network of several interconnected strands.…”

Borates: A Rich Source for Optical Materials

“…The MB 4 O 7 (M = Ca, Sr, Ba, Pb, Sn, etc . ) − series with the space group of Pmn 2 1 , MnB 7 O 13 Br and its isomorphic phases in cubic F 3 c , SrB 2 O 4 , and MnB 2 O 4 and their isomorphic phases with the space group of P 2 1 / c and Pa , as well as the RE 2 B 8 O 15 (RE = La, Nd, Pr) series all belong to the type A framework. All of them are exclusively constructed by [BO 4 ] tetrahedra that are strongly interconnected via sharing corners to form complicated 3D frameworks that host the M-site cations within the channels formed by B–O anionic frameworks.…”

Lattice dynamics and a magnetic-structural phase transition in the nickel orthoborateNi3(BO3)2Pisarev1, Prosnikov2, Davydov3 et al. 2016Phys. Rev. B191100View full textAdd to dashboardCite

“…Chemically similar transition-metal oxyborates MB2O4 (M = Mn, Fe, Co, and Ni) can be synthesized only under high-pressure and high-temperature conditions but typically they possess a monoclinic structure; (see, e.g., the recent publication on MnB2O4 [21] and references therein).…”