Ferromagnetic ordering in a new nickel polyborate NiB12O14(OH)10

Abstract

A new nickel polyborate, NiB12O14(OH)10 was synthesized using boric acid as a flux. This material has two-dimensional borate layers with a quasi-square lattice of Ni2+. The Ni2+ ions locate in the plane of the two-dimensional layer, bridged through BnO(n+1) chains in the plane and connected with the three-membered ring borate groups out of the plane. The dc and ac magnetic susceptibility, magnetization and specific heat measurements show that this material undergoes a weak ferromagnetic phase transition at Tc = 5.8 K. At T < Tc, a metamagnetic phase transition is observed at about 5 T, associated by a spin-flop, suggesting the ferromagnetic ordering is induced by an antiferromagnetic interaction. A broad maximum in the ac susceptibility at TM = 23-24 K indicates an intermediate short-range ordering.

Facile synthesis of paramagnetic Co(II)-hexaborate(2-) based semiorganic complexes: A combined investigation on X-Ray crystal structure, Hirshfield surfaces analysis, optical and magnetic properties

“…It attracts the main focus of interest in academic and industrial studies because of their rich structures and specially their great aptitude to be coordinated with other species like d-elements (Cu 2+ , Co 2+ , Ni 2+ ….) and organic cations [7][8][9][10][11][12][13][14]. In fact, this great synergy arouses novel coordination metal complexes with signi cant optical and magnetic properties speci cally owing to the existence of electrons in the d orbital (paired or unpaired).For example, Mohammed A.…”

“…Using the classi cation of polyborates anions proposed by Hellen, Chris and Clark[22], the fundamental building blocks(FBB) shorthand notation for the hexameric [B 6 O 7 (OH) 6 ] 2− anion present in compounds1 and 2is 6:3Δ + 3T.The main bond lengths and angles of the two systems are recorded in (TableS1). The Co-O bonds lengths are ranged between 2.0125(11) Å and 2.1776(11) Å in compound 1 and 2.041(3) Å and 2.147(3) Å in compound 2with a good agreement with previously obtained hexaborato-cobaltate complexes in (C 4 H 12 N 2 )[Co{B 6 O 7 (OH) 6 } 2 ].6H 2 O [7], (C 5 H 14 N 2 )[Co{B 6 O 7 (OH) 6 } 2 ].2H 2 O [23] and (C 5 H 11 N 3 ) [Co{B 6 O 7 (OH) 6 } 2 ].4H 2 O [24].…”

Na5[MB24O34(OH)12]·nH2O (M = Cr3+, Al3+): Unprecedented Spherelike Polyborate Clusters from Boric Acid Flux Synthesis

“…BBO (β-BaB 2 O 4 ), BIBO (α-BiB 3 O 6 ), , and LBO (LiB 3 O 5 ) are well-known examples. The transition-metal borates, on the other hand, are also very interesting, due to their magnetic behavior – and reversible Li-ion uptake. – Recently, a number of transition-metal borates with open frameworks have been reported. – For example, MCuB 7 O 12 · n H 2 O (M = Na, K) contains one-dimensional 14-ring channels formed by CuO 6 , BO 4 , and BO 3 . The water molecules and alkali-metal cations located in the 14-ring channels are removable.…”

“…[7][8][9][10][11][12][13][14][15][16][17] Current interest in borates stems from their non-linear optical properties, originating mostly from their complex structures, often with noncentrosymmetric structures. BBO (β-BaB 2 O 4 ), 18 BIBO (R-BiB 3 O 6 ), 19,20 and LBO (LiB 3 O 5 ) 21 borates, on the other hand, are also very interesting, due to their magnetic behavior [22][23][24][25][26][27] and reversible Li-ion uptake. [28][29][30] Recently, a number of transition-metal borates with open frameworks have been reported.…”