Effect of magnesium substitution on structural and dielectric properties of LiNiPO₄

The aim of this paper is to study the effect of Mg²⁺ doping in place of Ni in LiNiPO₄ compounds synthesized by solid state reaction method. As Mg is a relatively light and cheap, and is expected to stabilize the structure, it has been considered as a substituent for Ni. The structural and conductivity studies of the substituted phases are discussed in comparison with LiNiPO₄. In this study, we have proposed cation-substituted compounds, LiNi_1–xMg_xPO₄ (x = 0, 0.05, 0.1 and 0.15) where a part of the divalent state of Ni²⁺ is replaced with the corresponding amount of Mg²⁺ and where the charge compensation is maintained by lithium deficiency. It is possible to obtain the mentioned compounds because the pristine LiNiPO₄ compound is stable in ambient atmosphere, which differs considerably from the LiCoPO₄ compound.