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A novel negative thermal expansion material of Zr0.70V1.33Mo0.67O6.73

机译:Zr 0.70 V 1.33 Mo 0.67 O 6.73 的新型负热膨胀材料

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A novel negative thermal expansion (NTE) material of Zr0.70V1.33Mo0.67O6.73 was synthesized. Its microstructure, crystal structure and thermal expansion properties were studied in detail. Structure analysis shows that Zr0.70V1.33Mo0.67O6.73 possesses a cubic crystal structure with the space group Pa (no. 205) at room temperature (RT). The experimental results show that Zr0.70V1.33Mo0.67O6.73 exhibits a stable isotropic negative thermal expansion property and maintains a cubic structure from 103 to 773 K without any phase transition. The average linear coefficients of thermal expansion (CTEs) are calculated to be ?3.75 × 10?6 K?1 (163–673 K) and ?4.50 × 10?6 K?1 (RT–773 K). The intrinsic linear CTEs are calculated to be ?3.84 × 10?6 K?1 (103–473 K) and ?4.22 × 10?6 K?1 (RT–673 K). And the phase transition temperature of ZrV2O7 has been reduced below RT, this may be attributed to the incorporation of the cubic ZrMo2O8 structure and partially occupied Zr atoms (4a). The NTE property of Zr0.70V1.33Mo0.67O6.73 can be attributed to the quasi-rigid unit modes (QRUMs).
机译:Zr 0.70 V 1.33 Mo 0.67的新型负热膨胀(NTE)材料合成了 O 6.73 。详细研究了其微观结构,晶体结构和热膨胀性能。结构分析表明Zr 0.70 V 1.33 Mo 0.67 O 6.73 在室温(RT)下具有立方晶体结构,空间群为 Pa (编号205)。实验结果表明Zr 0.70 V 1.33 Mo 0.67 < /small>O6.73 具有稳定的各向同性负热膨胀特性,并在103至773 K之间保持立方结构,没有任何相变。计算得出的平均线性热膨胀系数(CTE)为?3.75×10 ?6 K ?1 (163–673 K)和?4.50×10 ?6 K ?1 (RT–773 K )。固有线性CTE计算为?3.84×10 ?6 K ?1 (103–473 K )和?4.22×10 ?6 K ?1 (RT–673 K)。 ZrV 2 O 7 的相变温度已降低至RT以下,这可能是由于ZrMo 2 O 8 立方结构和部分占据的Zr原子的结合(4a)。 Zr 0.70 V 1.33 Mo 0.67 的NTE性质small> O 6.73 可以归因于准刚性单位模式(QRUM)。

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