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Title: From NaZn4Sb3 to HT-Na1–xZn4–ySb3 : Panoramic Hydride Synthesis, Structural Diversity, and Thermoelectric Properties

Journal Article · · Chemistry of Materials

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 crystalizes in the hexagonal $$P$$63/$mmc$ space group (No. 194, Z=2, a=4.43579(4) Å, c = 23.41553(9) Å), 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 considerable degrees of structural disorder ($$P2_1/c$$ (No. 14, $$Z$$=32), a=19.5366(7) Å, b=14.7410(5) Å, c = 20.7808(7) Å, $$β$$ = 90.317(2)°) and is stable exclusively in a narrow temperature range of 736-885 K. Further heating of HT-Na1-xZn4-ySb3 leads to a reversible transformation to NaZnSb above 883 K. Both compounds exhibit similarly low thermal conductivity at room temperature (0.9 W∙m-1 K-1) and positive Seebeck coefficients (38–52 $$μ$$V/K) indicative of holes as the main charge carriers. However, resistivities of the two phases differ by two orders of magnitude.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
1572381
Report Number(s):
IS-J 10066
Journal Information:
Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 21 Vol. 31; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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