In this paper, a series of ErFe_1−xMn_xO₃ (x = 0, 0.1, 0.3, 0.5) were readily prepared by the sol–gel method, with citric acid as the combustion agent. The powder gradually changes from the orthorhombic phase (ErFeO₃, space group Pbnm) to the hexagonal phase (ErFe_0.5Mn_0.5O₃, space group P6₃cm). Reduction in the optical band gap from 2.10 eV of ErFeO₃ to 1.69 eV of ErFe_0.5Mn_0.5O₃ is observed. Photocatalytic study on methylene blue (MB) by visible light irradiation showed that the photocatalytic activities are greatly enhanced for Mn-substituted ErFeO₃, due to the narrower band gap and smaller particle size. Interestingly, ErFe_0.5Mn_0.5O₃ also behaves complete degradation of MB within 120 min vibration, indicating the existence of piezo-electrochemical coupling. The possible photocatalytic and vibration catalytic mechanism of this system was also proposed. The results indicates that this system will be a good candidate for the decomposition of organic pollutant through utilizing both the natural vibration and solar energy.

在本文中， 以柠檬酸为助燃剂，通过溶胶-凝胶法很容易制备出一系列的ErFe _1-x Mn _x O ₃（x = 0、0.1、0.3、0.5 ）。粉末从正交相（ErFeO ₃，空间群Pbnm）逐渐变为六方相（ErFe _0.5 Mn _0.5 O ₃，空间群P6 ₃ cm）。光学带隙从2.10 eV的ErFeO _3降低到1.69 eV的ErFe _0.5 Mn _0.5 O ₃被观察到。可见光对亚甲基蓝（MB）的光催化研究表明，由于带隙更窄，粒径较小，Mn取代的ErFeO ₃的光催化活性大大提高。有趣的是，ErFe _0.5 Mn _0.5 O ₃还在120分钟振动内表现出MB的完全降解，表明存在压电-电化学耦合。还提出了该系统可能的光催化和振动催化机理。结果表明，该系统通过利用自然振动和太阳能，将是有机污染物分解的良好候选者。