A novel negative thermal expansion material of Zn₂V_1·7P_0·3O₇ is prepared using a solid-state method. Its phase, microstructure, thermal expansion property, and Raman spectra are analyzed in detail. Experimental results show that Zn₂V_1·7P_0·3O₇ exhibits excellent negative expansion characteristics with an expansion coefficient of −4.47 × 10⁻⁶ K⁻¹ in a wide temperature range of RT-673 K. The underlying mechanism of the negative thermal expansion of Zn₂V_1·7P_0·3O₇ is as follows. The distorted [ZnO₅] trigonal bipyramides and [V₂O₇] structural units with staggered Cs symmetry (part of which V is replaced by P) in Zn₂V_1·7P_0·3O₇ are connected by sharing O₂ and O₃ atoms to form a chain, such that the sample has a layered staggered structure. The lateral vibration of the O₃ atoms and the coupling twist and rotation effect of [ZnO₅] and [VO₄] polyhedrons intensify, causing angles between Zn–O_3(long)-V and Zn–O_3(short)-V to decrease gradually. The gap between the inner layers of unit cell is gradually reduced, and the volume of Zn₂V_1·7P_0·3O₇ shrinks slowly.

采用固态法制备了新型的Zn ₂ V _1·7 P _0·3 O ₇负热膨胀材料。详细分析了其相，微结构，热膨胀特性和拉曼光谱。实验结果表明，Zn ₂ V _1·7 P _0·3 O ₇在RT-673 K的较宽温度范围内均表现出优异的负膨胀特性，膨胀系数为-4.47×10 ^-6  K ^-1。 Zn ₂ V _1·7 P _0·3 O ₇的负热膨胀如下。Zn ₂ V _1·7 P _0·3 O _7中具有扭曲的Cs对称性的[ZnO ₅ ]三角双锥体和[V ₂ O ₇ ]错位的Cs对称结构单元（部分V被P取代）连接在一起，并通过共享O ₂连接O ₃和O ₃原子形成链，因此样品具有分层的交错结构。O ₃原子的横向振动以及[ZnO ₅ ]和[VO ₄ ]多面体的耦合扭曲和旋转效应增强，导致Zn–O _3（长） -V和Zn–O _3（短）之间形成角度-V逐渐降低。晶胞内层之间的间隙逐渐减小，Zn ₂ V _1·7 P _0·3 O ₇的体积缓慢收缩。