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Realizing nearly isotropic thermoelectric properties in 2D-layered SnS nanomaterials through highly symmetric metastable-phase powder precursors

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Nano Research 2022年第8期15卷 7713-7722页

作者： Fanshi Wu Junjie Yuan Wenxin Lai Liangwei Fu Biao Xu School of Chemistry and Chemical Engineering Nanjing University of Science&TechnologyNanjing 210094China State Key Laboratory of Coordination Chemistry School of Chemistry and Chemical EngineeringCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China

metastable materials offer a broad and novel platform for the development of next-generation science and *** engineering including synthesis of materials with unconventional phases and phase transition of metastable materials has been explored in layered materials but has not tackled their anisotropy issue *** high anisotropy in layered materials further adds the cost of orientation screening of ***,we report the effect of Ag doping on facilitating the formation of metastableπ-cubic phase SnS during the solvothermal synthesis *** this basis,we construct cubic-to-orthorhombic(CTO)samples and elucidate the intrinsic mechanisms of its nearly isotropic thermoelectric properties by characterizing the texturing information and analyzing the valence charge density calculated by density functional theory(DFT).This work demonstrates a convenient approach to synthesize layered materials with isotropic electrical and thermal transport behaviors through a precursor of metastable phase.

关键词： thermoelectric SnS metastable materials anisotropy density functional theory(DFT)

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Batch synthesis of rare-earth nickelates electronic phase transition perovskites via rare-earth processing intermediates

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Rare Metals 2022年第10期41卷 3495-3503页

作者： Xiao-Yu Li Zi-Ang Li Feng-Bo Yan Hao Zhang Jia-Ou Wang Xin-You Ke Yong Jiang Nuo-Fu Chen Ji-Kun Chen School of New Energy North China Electric Power UniversityBeijing102206China School of materials Science and Engineering University of Science and Technology BeijingBeijing100083China Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing100049China Department of Mechanical and Aerospace Engineering Case Western Reserve UniversityClevelandOH44106USA

The rare-earth nickelates(RENiO_(3)) exhibit an exceptional complex electronic phase diagram and multiple electronic phase transitions that enrich promising applications in correlated electronic devices beyond conventional ***,the practical applications of RENiO_(3) are challenged by their intrinsic thermodynamic metastability in material synthesis and high material ***,developing an economical strategy to achieve the batch synthesis of RENiO_(3) is of vital *** this work,we enlarged the synthesis amount of RENiO_(3) up to 20 g per batch using chloride(KCI) assisted molten salt *** optimizing the reaction conditions,the powder of RENiO_(3) with the cubic shape and average size of ~2μm was effectively synthesized,while their phase purity exceeded 95%.In addition,the cost to synthesize RENiO_(3) was further reduced by using rare-earth extraction intermediate products as the raw materials,instead of using the pure rare-earth *** also achieved wide adjustments in the metal-to-insulator-transition temperature from160 to 420 K without significantly reducing the transition *** enlarging the synthesis amount and the reducing the cost,it paves the way to the device application of RENiO_(3).

关键词： Quantum materials Rare-earth nickelates metastable materials Perovskite oxides

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