Abstract The nanocrystalline particles of BiFO 3 ,co-doped with ytterbium and cobalt Bi 1−x Yb x Co y Fe 1−y O 3 (BYCFO) were fabricated via micro-emulsion method using cetyltrimethyl ammonium bromide (CTAB) as a surfactant. The dopant contents were kept x = 0.00, 0.025, 0.05, 0.075, 0.1, 0.125 and y = 0.00, 0.05, 0.1, 0.15, 0.2, 0.25 for six different compositions. The BYCFO-nanoparticles were investigated for structure, electric, dielectric, magnetic and photocatalytic properties. The X-ray diffraction (XRD) analysis confirmed the normal growth habitat Rhombohedral ( R 3 c ) phase on inclusion of ytterbium and cobalt ions as it is observed in undoped BiFeO 3 multiferroic. However further doping of Yb +3 and Co +3 ions (x = 0.125, y = 0.25) resulted in some extra peaks, that is attributed to the formation of extra phase. The vibrating sample magnetometer recorded saturated magnetization (Ms) 0.385 emu/g with remanent magnetization (Mr) 0.13 emu/g for a coercivity of 405 Oe which is higher than the undoped BiFeO 3 . The substitution of Yb +3 and Co +3 ions improved the canting angle and optimally aligned the sub lattices in ferromagnetic order. The grain size was found in the range of 20–24 nm which is less than spiral spin modulation (≈ 62 nm). The entire dielectric parameters showed smooth decreasing trend in low range frequency but at higher frequency (1.98 GHz) resonance peaks appeared in the spectra. The insulating character was also enhanced up to 16.42 × 10 10 Ω cm −1 , with increase in doping concentrations. The optical band gap was measured 1.5 eV which was lower than the undoped BiFeO 3 (2.15 eV). The photocatalytic performance of co doped ceramic (Bi 0.875 Yb 0.125 Co 0.25 Fe 0.75 O 3 ) was monitored using the textile dye Congo red. Approximately 28% of initial concentration (0.5 ppm) was degraded by 200 mg of ceramics in 42 min under visible light irradiation. Being magnetic in nature, the Bi 1−x Yb x Co y Fe 1−y O 3 particles could be separated by conventional magnetic bar.

中文翻译：

---

Yb和Co对纳米晶多铁性BiFeO 3 颗粒结构、磁、电和光催化行为的影响

摘要 以十六烷基三甲基溴化铵（CTAB）为表面活性剂，通过微乳液法制备了掺镱和钴Bi 1-x Yb x Co y Fe 1-y O 3 的BiFO 3 纳米晶颗粒（BYCFO）。对于六种不同的组合物，掺杂剂含量保持为 x = 0.00、0.025、0.05、0.075、0.1、0.125 和 y = 0.00、0.05、0.1、0.15、0.2、0.25。研究了 BYCFO 纳米颗粒的结构、电、介电、磁和光催化性能。X 射线衍射 (XRD) 分析证实了包含镱和钴离子的正常生长栖息地菱形 (R 3 c ) 相，正如在未掺杂的 BiFeO 3 多铁性中观察到的那样。然而，Yb +3 和 Co +3 离子的进一步掺杂（x = 0.125，y = 0.25）导致了一些额外的峰，这是由于额外相的形成。振动样品磁力计记录到饱和磁化强度 (Ms) 0.385 emu/g，剩余磁化强度 (Mr) 0.13 emu/g，矫顽力为 405 Oe，高于未掺杂的 BiFeO 3 。Yb +3 和 Co +3 离子的取代改善了倾斜角并使亚晶格以铁磁顺序最佳排列。发现晶粒尺寸在 20-24 nm 范围内，这小于螺旋自旋调制（≈ 62 nm）。整个介电参数在低频范围内呈现平滑下降趋势，但在高频（1.98 GHz）光谱中出现共振峰。随着掺杂浓度的增加，绝缘特性也增强到 16.42 × 10 10 Ω cm -1 。测得的光学带隙为 1.5 eV，低于未掺杂的 BiFeO 3 (2.15 eV)。共掺杂陶瓷(Bi 0. 875 Yb 0.125 Co 0.25 Fe 0.75 O 3 ) 使用纺织染料刚果红进行监测。在可见光照射下，200 毫克陶瓷在 42 分钟内降解了大约 28% 的初始浓度（0.5 ppm）。由于具有磁性，Bi 1-x Yb x Co y Fe 1-y O 3 颗粒可以通过常规磁棒分离。