论文标题
Ni取代的磁电磁电元的磁性和结构特性
Magnetic and structural properties of Ni-substituted magnetoelectric Co$_4$Nb$_2$O$_9$
论文作者
论文摘要
PolyCrystalline Co $ _ {4-X} $ ni $ _x $ _x $ _2 $ _2 $ o $ _9 $（x = 1,2）的磁性和结构特性已通过中子粉末衍射，磁化和热容量测量和密度功能理论（DFT）计算。对于X = 1，化合物在三角形P $ \ bar {3} $ C1空间组中结晶。低于t $ _n $ = 31 K，它会在AB-平面中产生一个弱非共线抗铁磁性结构。具有X = 2的化合物具有正交性PBCN空间群的晶体结构，并在T $ _C $ = 47 K下显示了坚硬的铁磁行为。对于该化合物，一种弱的非元素铁磁性结构，在AB平面中具有两种可能的构型。通过通过DFT计算磁各向异性能量，确定了该化合物的地面磁构型。高达140 KOE的磁场中的热容量研究提供了有关化合物磁性结构的更多信息。
The magnetic and structural properties of polycrystalline Co$_{4-x}$ Ni$_x$ Nb$_2$ O$_9$ (x=1,2) have been investigated by neutron powder diffraction, magnetization and heat capacity measurements, and density functional theory (DFT) calculations. For x=1, the compound crystallizes in the trigonal P$\bar{3}$c1 space group. Below T$_N$ = 31 K it develops a weakly non-collinear antiferromagnetig structure with magnetic moments in the ab-plane. The compound with x=2 has crystal structure of the orthorhombic Pbcn space group and shows a hard ferrimagnetic behavior below T$_C$ =47 K. For this compound a weakly non-collinear ferrimagnetic structure with two possible configurations in ab plane was derived from ND study. By calculating magnetic anisotropy energy via DFT, the ground-state magnetic configuration was determined for this compound. The heat capacity study in magnetic fields up to 140 kOe provide further information on the magnetic structure of the compounds.
