Structural and dynamic properties of MgAgSb-based thermoelectric materials studied by neutron scattering

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dc.contributor.authorLi, XYen_AU
dc.contributor.authorWang, BTen_AU
dc.contributor.authorGuidi, Ten_AU
dc.contributor.authorAvdeev, Men_AU
dc.contributor.authorHe, LHen_AU
dc.contributor.authorZhao, HZen_AU
dc.contributor.authorWang, FWen_AU
dc.date.accessioned2021-09-22T02:24:35Zen_AU
dc.date.available2021-09-22T02:24:35Zen_AU
dc.date.issued2017-07-12en_AU
dc.date.statistics2021-09-20en_AU
dc.description.abstractA breakthrough on thermoelectric materials was recently reported in MgAgSb-based compounds with high ZT value (ZT ~ 1.4 at 450 - 530 K), stimulating the new prospects on the near room temperature (RT) application of thermoelectric generation and solid-state cooling. Here, high resolution neutron powder diffraction (NPD) and inelastic neutron scattering (INS) experiments were performed using ECHIDNA @ ANSTO and MARI @ ISIS, respectively. Rietveld structure refinement of the NPD data indicates that the space group of MgAg0.97Sb0.99 is I-4c2 both at 3 K and 300 K. Combining magnetic and heat-capacity measurements demonstrated that there are no phase transitions between 3 K to RT, in contrast with rich structural phase transitions in the RT - 700 K range. Considering the remarkable crystal-grain-size effect on the thermoelectric performance, we refined the apparent size of ~ 22 nm, validating the TEM result of 10 - 20 nm. We demonstrated that the phonon density of states (PDOS) deduced from MARI data is roughly in agreement with our ab initio calculations. We also analyzed the resonant bonding and LA-TO coupling which are believed to responsible for the low phonon thermal conductivity. Amazingly only 0.5% Ni doping at Ag site reduces the thermal conductivity by more than 8%. High resolution INS experiments to accurately measure the low frequency PDOS will be performed to study the Ni doping effect on the low thermal conductivity mechanism, combining with ab initio calculation.en_AU
dc.identifier.citationLi, X., Wang, B., Guidi, T., Avdeev, M., He, L., Zhao, H. & Wang, F. (2017). Structural and dynamic properties of MgAgSb-based thermoelectric materials studied by neutron scattering. Paper presented at ICNS 2017 (International Conference on Neutron Scattering), Daejeon, South Korea, 9 to 13 July 2017. Retrieved from: http://www.icns2017.org/program.phpen_AU
dc.identifier.conferenceenddate13 July 2017en_AU
dc.identifier.conferencenameICNS 2017 (International Conference on Neutron Scattering)en_AU
dc.identifier.conferenceplaceDaejeon, South Koreaen_AU
dc.identifier.conferencestartdate9 July 2017en_AU
dc.identifier.urihttp://www.icns2017.org/program.phpen_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/11790en_AU
dc.language.isoenen_AU
dc.publisherInternational Conference on Neutron Scatteringen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectInelastic scatteringen_AU
dc.subjectThermoelectric materialsen_AU
dc.subjectThermoelectric generatorsen_AU
dc.subjectCoolingen_AU
dc.subjectANSTOen_AU
dc.titleStructural and dynamic properties of MgAgSb-based thermoelectric materials studied by neutron scatteringen_AU
dc.typeConference Abstracten_AU
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