Bismuth based cubic pyrochlore materials have the attractive dielectric properties, especially the dielectric tunable property. The Bi_1.5MgNb_1.5O₇ (BMN) and Bi_1.5Mg_1-xNi_xNb_1.5O₇ (BMN-xNi) (x = 0.1–0.5) ceramics were prepared by solid state reaction method. XPS spectra of probing evidence for displacive disorder in BMN-xNi by compared with pristine BMN, which confirms the presence of two types of oxygen in the structure. The relative Ni content is the fundamental factor affects the disorder degree in the BMN-xNi structure. It demonstrated that Ni²⁺ ions prior to substitute onto the A-site of BMN-xNi ceramics when x < 0.3, then which would turn to substitute on the B-site with further increasing Ni content. Moreover, The dielectric response of BMN-xNi are investigated within the temperature range of −50–150 °C at 1 MHz. All the dielectric constants show a slightly decrease with the increasing temperature in the testing temperature range, while the dielectric losses increase sharply with temperature. In addition, the dielectric constant of BMN-xNi pyrochlores increases with the increases of Ni content when x < 0.3, then shows a decrease with further increasing Ni content. However, the Ni content shows little influence on dielectric loss of BMN-xNi pyrochlores. As a result, the BMN-0.3Ni ceramics present the enhanced dielectric properties.

铋基立方烧绿石材料具有有吸引力的介电性能，尤其是介电可调性。 通过固态反应法制备了Bi _1.5 MgNb _1.5 O ₇（BMN）和Bi _1.5 Mg _{1- x} Ni _x Nb _1.5 O ₇（BMN- x Ni）（x = 0.1-0.5）陶瓷。与原始BMN相比，BMN- x Ni置换异常的探测证据的XPS光谱证实了结构中存在两种类型的氧。相对镍含量是影响BMN- x无序度的基本因素镍结构。结果表明，当x <0.3时，Ni ²⁺离子先替代BMN-xNi陶瓷的A位，然后随着Ni含量的进一步增加，替代B位。此外，在−50–150°C的温度范围内（1 MHz）研究了BMN- x Ni的介电响应。在测试温度范围内，所有介电常数均随温度的升高而略有降低，而介电损耗则随温度的升高而急剧增加。另外，当x增大时，BMN- x Ni烧绿石的介电常数随Ni含量的增加而增加。 <0.3，则表明随着Ni含量的进一步增加而降低。但是，Ni含量对BMN- x Ni烧绿石的介电损耗影响很小。结果，BMN-0.3Ni陶瓷具有增强的介电性能。