Metal chalcogenide alloys are considered as electronic materials owing to their adjustable electrical properties either by doping or alloying. In this study, the electrical and thermal properties of the NiS₂–NiSe₂ system are investigated by synthesizing Ni(S_1-xSe_x)₂ (x = 0, 0.25, 0.5, 0.75, and 1.0) compositions. All samples exhibit pyrite-type cubic structures and form complete solid solution alloys. It is found that the NiS₂–NiSe₂ system exhibits a wide spectrum of electrical characteristics; NiS₂ exhibits semiconducting conduction with low electrical conductivity σ of 7.8 S/cm and a carrier concentration of ∼10¹⁹ cm⁻³ at room temperature, whereas NiSe₂ exhibits metallic conduction with high σ of 11,600 S/cm and ∼10²¹ cm⁻³ carriers. As x of Ni(S_1-xSe_x)₂ increased, the σ is gradually increased. On the other hand, the magnitude of Seebeck coefficient S is gradually decreased with x at 700 K. Thus, the optimized power factor (S²∙σ) of 0.10 mW/mK² at 700 K is achieved for Ni(S_0.75Se_0.25)₂ composition. Lattice thermal conductivities of the solid solution samples (x = 0.25, 0.5 and 0.75) range from 2.0 to 3.8 W/mK at 300 K, representing a reduction compared to those of NiS₂ and NiSe₂ (5.5 and 6.1 W/mK, respectively). Consequently, an enhanced thermoelectric performance was achieved in Ni(S_0.75Se_0.25)₂ benefiting from an optimized solid solution alloying, with a maximum thermoelectric figure of merit of 0.020 at 700 K.

金属硫族化物合金由于其可通过掺杂或合金化调节电性能而被认为是电子材料。在这项研究中，通过合成Ni(S _{1- x} Se _x ) ₂ ( x  = 0、0.25、0.5、0.75和1.0)成分来研究NiS ₂ –NiSe _{2系统的电学和热学性质。}所有样品均呈现黄铁矿型立方结构并形成完全固溶体合金。研究发现NiS ₂ –NiSe ₂体系表现出广泛的电学特性；NiS ₂ 在室温下表现出半导体传导性，其电导率σ为7.8 S/cm，载流子浓度为~10 ¹⁹  cm ^{-3 ，而NiSe} ₂则表现出金属传导性，其电导率σ为11,600 S/cm，载流子浓度为~10 ²¹  cm ^{-3 3个}运营商。随着Ni(S _{1- x} Se _x ) _{2 的}x增加，σ逐渐增加。另一方面，塞贝克系数S的大小在 700 K 时随x逐渐减小。因此，Ni(S _0.75 Se _0.25在 700 K 时实现了0.10 mW/mK ²的优化功率因数 ( S ² ∙ σ ) ) ₂组成。固溶体样品的晶格热导率（x  = 0.25、0.5 和 0.75）在 300 K 时范围为 2.0 至 3.8 W/mK，与 NiS ₂和 NiSe _{2的晶格热导率}（分别为 5.5 和 6.1 W/mK）相比有所降低）。因此，受益于优化的固溶合金化，Ni(S _0.75 Se _0.25 ) ₂实现了增强的热电性能，在 700 K 时最大热电品质因数为 0.020。