EuTi_0.5W_0.5O_3-xN_x oxynitrides with nitrogen contents between 0.87 and 1.63 have been synthesized by ammonolysis of EuTi_0.5W_0.5O₄ scheelite at high temperature. They are B-site disordered perovskites that show two different crystal symmetries as a function of the nitrogen content, changing at x near 1.3 from cubic Pm-3m to orthorhombic Pbnm. The nitriding degree is tuned by the ammonia flow rate and synthesis temperature, and determines the oxidation states of the cations and the equilibrium Eu²⁺ + W⁶⁺ ↔ Eu³⁺+W⁵⁺ promoting the decrease of the tolerance factor and the structural transition for large x values and electronic reconstructions. Accompanying the symmetry lowering, the nature of the magnetic order of Eu²⁺ moments changes from ferromagnetic to antiferromagnetic as a result of a complex interplay of antiferromagnetic/ferromagnetic superexchange interactions balanced by structural effects and the carrier-mediated magnetic exchange between Eu²⁺ ions.

通过在高温下氨解EuTi _0.5 W _0.5 O ₄白钨矿，合成了氮含量在0.87至1.63之间的EuTi _0.5 W _0.5 O _3-x N _x氮氧化物。它们是B位置无序的钙钛矿，显示出两种不同的晶体对称性，这是氮含量的函数，在接近1.3的x处从立方Pm-3m变为正交斜Pbnm。氮化程度由氨气流量和合成温度调谐，并且确定阳离子和平衡Eu的氧化态²⁺  + W ⁶⁺ ↔的Eu ³⁺ + W ⁵⁺促进大x值和电子重构的公差因子的降低和结构转变。伴随对称性降低，由于反铁磁/铁磁超交换相互作用的复杂相互作用（通过结构效应和Eu ²⁺离子之间的载体介导的磁交换），复杂的结果使Eu ²⁺矩的磁阶性质从铁磁变为反铁磁。