Chemical pressure effects on structural, dielectric and magnetic properties of solid solutions Mn3−xCoxTeO6

Mn3TeO6- a new multiferroic material with two magnetic substructures

“…A magnetic field induced spontaneous electric polarization has been discovered in Co 3 TeO 6 and a colossal magnetoelectric (CME) effect below its AFM ordering temperature of about 52 K was reported in Ni 3 TeO 6 . Here we focus on Mn 3 TeO 6 which was found to exhibit a complex spin structure with both helical and cycloidal components . We have carried out a comprehensive study of the magnetic susceptibility, specific heat, local electronic structure, dielectric permittivity, and electric polarization, and discovered that Mn 3 TeO 6 is multi‐ ferroic.…”

“…Very recently, the transition metal orthotellurates M 3 TeO 6 (M = Mn 2+ , Co 2+ , and Ni 2+ ) with a corundum-related structure have attracted considerable attention [15][16][17][18][19][20][21]. A magnetic field induced spontaneous electric polarization has been discovered in Co 3 TeO 6 [15] and a colossal magnetoelectric (CME) effect below its AFM ordering temperature of about 52 K was reported in Ni 3 TeO 6 [19].…”

Enhancement of antiferromagnetic interaction and transition temperature in M3TeO6 systems (M = Mn, Co, Ni, Cu)

“…The magnetic properties were investigated by magnetization and heat capacity measurements (MPMS squid magnetometer and PPMS setup from Quantum Design Inc.). Crystal and magnetic structures of the samples with M = Mn, Co, and (Mn,Co) have been studied by x-ray (XRD) and neutron (NPD) powder diffraction [4,5,13]. Corresponding data for the samples with M = Ni and Cu was obtained from literature [6,7].…”

“…Linear fits of H/M (T ) data recorded up to higher temperatures were performed, yielding estimates Table 1. Antiferromagnetic transition temperatures TN (K) and structural parameters extracted from Rietveld refinements [8] and polyhedral analysis [9] for selected M3TeO6 samples (NPD data at 5K for M =Mn, Co, and Mn0.2Co0.8 [4,5,13]; XRD data at 295 K for M =Ni and Cu [6,7] included for comparison): ionic size rA of M 2+ on A-site ( Å); space group s.g.; minimum, maximum, and mean values of M -O bond length ( Å) and M -M distance ( Å); volume VA ( Å3 ), distortion ωA, and shift from centroid xA ( Å) of M 2+ in its coordination polyhedron. a M -O and M -M distances were averaged over the values obtained for each non-equivalent M (i) cations (i=5 for M =Co and i=3 for M =Ni); minimum-maximum values of VA, ωA, and xA are indicated.…”

Crystal Structures, Optical, and Magnetic Properties of Zn3-xMnxTeO6

“…磁电多铁材料电子器件可满足大容量、 高速度、 低能耗等现代信息产业的发展需要, 已成为自旋电 子学器件研究的前沿热点 [1][2][3] 。由于铁电和铁磁材料 在化学键和电子结构方面的互斥性, 设计和制备极 性磁材料具有很大挑战, 造成磁电多铁性材料十分 稀少, 现存材料大多实用性差 [4][5] 。目前只有少数几 种室温单相多铁性材料报道, 如反铁磁性 BiFeO 3 (BFO, 奈尔温度 683 K) [6] 和六角铁氧体 Sr 3 Co 2 Fe 24 O 41 (SCFO, 居里温度 670 K) [7] 。其中 BFO 是 G-型反铁 磁或弱铁磁体, 磁电耦合效应弱, 一定程度上限制 了这类化合物的应用, 另外 SCFO 结构复杂, 合成 困难, 而且难以得到纯相。 经研究发现, 刚玉结构化 合物为设计极性和磁性材料提供了理想平台可以解 决上述问题 [8] 。刚玉结构(α-Al 2 O 3 )是基于氧化物离 子六方密堆积(hcp)而形成的, Al 3+ 占据三分之二八 面体位置的一类化合物 [9] 。M 3 TeO 6 (M=Mg, Mn, Ni, Cu, Zn, Co)类型的化合物具有丰富的几何构型, 是 重要的类刚玉结构化合物, 可用于磁电多铁材料等 方面 [10] 。M 3 TeO 6 (M=Mg, Mn, Ni, Zn, Co)型类刚玉 结构主要可以分为四种类型, 分别为 1) M 3 TeO 6 (M=Mg, Mn, R-3)型 [11][12] , 2) Ni 3 TeO 6 型(R3) [13] , 3) Cu 3 TeO 6 (Ia-3) [14][15][16][17] , 以 及 4) M 3 TeO 6 (M=Zn, Co, C2/c)型 [18][19][20] [21] , Cu 3 TeO 6 表现出 三维自旋网结构, 是一种反铁磁材料 [22] , Co 3 TeO 6 是第二类反铁磁性多铁材料 [23][24][25][26][27][28] 。 刚玉结构中过渡金属离子的相互掺杂替换对其 结构与性能产生影响。Co 3 TeO 6 是近期发现的一种 低对称性的低温第二类多铁材料, 具有复杂的磁结 构并伴随一系列反铁磁转变 [29][30][31] , 而 Mn 3 TeO 6 属于 高对称性化合物, 在低温时具有反铁磁转变 [32] 。 Co 3 TeO 6 (CTO)和 Mn 3 TeO 6 (MTO)的反铁磁转变温度 分别约为 23 和 26 K [31] 。而当 Mn 掺入 Co 3 TeO 6 中 或者 Co 掺入 Mn 3 TeO 6 中会使其反铁磁温度达到约 40 K [16,33]…”