Influence of Mn composition on structural, optical, dielectric and magnetic properties of synthesized Cd1−xMnxTe (x = 0.08 & 0.12) polycrystals

Abstract

This research article reports the synthesis of polycrystalline cadmium manganese telluride (Cd_1−xMn_xTe, CMT with x = 0.08 & 0.12) using a homemade horizontal furnace and studies the influence of Mn concentration on the structure, optical, dielectric and magnetic properties of the polycrystalline material. The phase formation and structure were confirmed by powder X-ray diffraction. The optical characteristics were examined using UV-visible–NIR spectroscopy, which revealed a blueshift in cutoff wavelength (λ_co) and an increase in bandgap with the increase in Mn concentration. The material showed low absorption coefficients, beneficial for optical isolator applications, enabling efficient light transmission with minimal loss. The photoconductivity analysis indicated negative photoconductivity, demonstrating the material's potential for photodetector applications. Additionally, the resistivity of CMT polycrystals was found to be in the order of 10⁷ to 10⁸ Ω cm. The dielectric constant, dielectric loss and dielectric impedance for the respective ratios were discussed. The saturation magnetization value and magnetic hysteresis loop increase with Mn concentration.