Perovskite BaTiO₃, Ba_0.98Na_0.02TiO₃, Ba_0.98Na_0.02Ti_0.97Fe_0.03O₃ and Ba_0.98Na_0.02Ti_0.95Fe_0.05O₃ ceramics have been prepared by solid state reaction method. The XRD analysis of these compositions revealed that a single-phase was formed having tetragonal crystal structure. A contraction of the perovskite unit cell volume was observed upon incorporation of 2 ​at% Na and 3 or 5 ​at% Fe. This contraction confirms that Na⁺ ions substitute Ba²⁺ cation while Fe³⁺ ions replace Ti⁴⁺ of BaTiO₃. Inclusion of Na⁺ ions into BaTiO₃ increases the dielectric constant while Fe³⁺ codoping decreases it. On contrast, incorporation of Fe³⁺ ions enhances the ferromagnetic properties of BaTiO₃. Na/Fe codoping leads to formation of oxygen vacancies in BaTiO₃ accompanied by new energy bands in visible light region. We show the suitability of such band-engineered Na/Fe codoped BaTiO₃ for sunlight photocatalytic application. The results of photocatalytic experiments showed that both Ba_0.98Na_0.02Ti_0.97Fe_0.03O₃ and Ba_0.98Na_0.02Ti_0.95Fe_0.05O₃ exhibit higher photocatalytic activity than undoped and Na doped BaTiO₃.

通过固相反应法制备了钙钛矿型BaTiO ₃，Ba _0.98 Na _0.02 TiO ₃，Ba _0.98 Na _0.02 Ti _0.97 Fe _0.03 O ₃和Ba _0.98 Na _0.02 Ti _0.95 Fe _0.05 O ₃陶瓷。这些组合物的XRD分析表明形成具有四方晶体结构的单相。掺入2at％的Na和3或5at％的Fe后，钙钛矿晶胞体积会收缩。该收缩证实了Na ⁺离子替代了Ba ²⁺Fe ³⁺离子代替BaTiO _3的Ti ⁴⁺。将Na ⁺离子包含在BaTiO _3中会增加介电常数，而Fe ³⁺共掺杂会降低介电常数。相反，掺入Fe ³⁺离子增强了BaTiO ₃的铁磁性能。Na / Fe共掺杂导致BaTiO ₃中氧空位的形成，并伴随可见光区域的新能带。我们表明这种能谱工程的Na / Fe共掺杂的BaTiO ₃在阳光光催化应用中的适用性。光催化实验结果表明，Ba _0.98 Na _0.02Ti _0.97 Fe _0.03 O ₃和Ba _0.98 Na _0.02 Ti _0.95 Fe _0.05 O ₃比未掺杂和Na掺杂的BaTiO ₃表现出更高的光催化活性。