Back to Search
Start Over
From NaZn4Sb3 to HT-Na1–xZn4–ySb3: Panoramic Hydride Synthesis, Structural Diversity, and Thermoelectric Properties
- Source :
- Chemistry of Materials. 31:8695-8707
- Publication Year :
- 2019
- Publisher :
- American Chemical Society (ACS), 2019.
-
Abstract
- Two new sodium zinc antimonides NaZn4Sb3 and HT-Na1–xZn4–ySb3 were synthesized by using reactive sodium hydride, NaH, as a precursor. The hydride route provides uniform mixing and comprehensive control over the composition, facilitating fast reactions and high-purity samples, whereas traditional synthesis using sodium metal results in inhomogeneous samples with a significant fraction of the more stable NaZnSb compound. NaZn4Sb3 crystallizes in the hexagonal P63/mmc space group (No. 194, Z = 2, a = 4.43579(4) A, c = 23.41553(9) A) and is stable upon heating in vacuum up to 736 K. The layered crystal structure of NaZn4Sb3 is related to the structure of the well-studied thermoelectric antimonides AeZn2Sb2 (Ae = Ca, Sr, Eu). Upon heating in vacuum, NaZn4Sb3 transforms to HT-Na1–xZn4–ySb3 (x = 0.047(3), y = 0.135(1)) due to partial Na/Zn evaporation/elimination, as was determined from high-temperature in situ synchrotron powder X-ray diffraction. HT-Na1–xZn4–ySb3 has a complex monoclinic structure with conside...
Details
- ISSN :
- 15205002 and 08974756
- Volume :
- 31
- Database :
- OpenAIRE
- Journal :
- Chemistry of Materials
- Accession number :
- edsair.doi...........b7261ffedd31d3eb177fba7a9d8ea040