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NMR and Mössbauer study of p-type half-Heusler thermoelectrics Nb 1- x Ti x FeSb

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dc.contributor Казанский федеральный университет
dc.contributor.author Tian Yefan
dc.contributor.author Ghassemi Nader
dc.contributor.author Li Rui
dc.contributor.author Vagizov Farit Gabdulhakovich
dc.contributor.author Ross Joseph H.
dc.contributor.author Ren Wuyang
dc.contributor.author Zhu Hangtian
dc.contributor.author Ren Zhifeng
dc.date.accessioned 2020-06-29T08:31:58Z
dc.date.available 2020-06-29T08:31:58Z
dc.date.issued 2020
dc.identifier.citation Tian, Y. NMR and Mössbauer study of p-type half-Heusler thermoelectrics Nb 1- x Ti x FeSb / Y. Tian, N. Ghassemi, R Li, F. Vagizov, W. Ren, H. Zhu, Z. Ren, J. Ross // Bulletin of the American Physical Society. - 2020. - V. 65, No. 1 - G27.00015.
dc.identifier.uri https://dspace.kpfu.ru/xmlui/handle/net/158965
dc.description.abstract To investigate the local behavior of defects and mixed compositions in NbFeSb-based semiconductors, for improved thermoelectric efficiency, we have performed 93Nb and 121Sb NMR, as well as Mössbauer measurements, on pure NbFeSb and a series of p-type Ti-substituted (Nb,Ti)FeSb samples with different substitution levels. A small but consistently increasing paramagnetic defect density is observed with the increase of Ti substitution level revealing the existence of additional Ti-induced paramagnetic defects. NMR line shapes show a clear difference between effect of intrinsic and extrinsic defects in NbFeSb. The NMR shifts can be well understood by a model combining a Knight shift and composition-dependent chemical shift. The results indicate a nearly rigid-band behavior for the valence band with a small enhacement of effective mass vs substitution. For pure NbFeSb samples, the Mössbauer spectra include an additional T-dependent singlet. The increase of its area can be explained based on carriers activated into a shallow acceptor-like defect level above the valence band, consistent with the defect activation results obtained with NMR. In samples with Ti substitution, the Mössbauer spectra are consistent with a random neighbor distribution, indicating no preferential local ordering.
dc.language.iso en
dc.relation.ispartofseries APS March Meeting 2020 March 2-6, 2020; Denver, Colorado Session G27: Electronic Structure: Thermodynamic & Optical Properties
dc.rights открытый доступ
dc.subject Mossbauer spectroscopy
dc.subject NMR
dc.subject thermoelectric efficiency
dc.subject NbFeSb-based semiconductors
dc.subject.other Физика
dc.title NMR and Mössbauer study of p-type half-Heusler thermoelectrics Nb 1- x Ti x FeSb
dc.type Article
dc.contributor.org Химический институт им. А.М. Бутлерова
dc.description.pages 1-14
dc.pub-id 234710

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