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Recent research progress on mixed valence state tungsten based materials

Tungsten 2019年第1期1卷 5-18页

作者： Shu Yin Yusuke Asakura Institute of Multidisciplinary Research for Advanced Materials Tohoku University2-1-1 KatahiraAoba-kuSendai 980-8577Japan

Synthesis and characterization of tungsten based mixed valence state nanoparticles and their novel applications are *** mixed valence state tungsten based homogeneous nanomaterials such as bronze structure M_(x)WO_(3)(M=Na^(+),K^(+),Rb^(+),Cs^(+),NH_(4)^(+),etc.)and tungsten sub-oxide W_(18)O_(49) possess excellent infrared(IR)light shielding property,implying their great potential applications on heat ray shielding and indoor energy saving effect in summer ***,some novel properties such as electric conductivity,bio thermal therapy function and electrochromic properties of mixed valence state tungsten based materials are *** design of components,formation of composites and structure control of thin films are expected to realize the property enhancement and candidates for practice application as window *** multifunc-tionality of the mixed valence state based composites also implies great potential on novel applications of various building materials.

关键词： Tungsten bronze mixed valence state Smart window Infrared(IR)light shielding Thermochromic Photothermal ablation therapy(PTA) Multifunctionality

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Room Temperature Modulated Structure of Ca and K co-Doped LaMnO_3

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Chemical Research in Chinese Universities 2012年第5期28卷 784-787页

作者： HOU Chang-min HUANG Ke-ke HU Bin YUAN Hong-ming FENG Shou-hua state Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangehun 130012R R.China

A series of perovskite compounds of La1-x-yCaxKyMnO3 was prepared by hydrothermal disproportionation reaction of MnO2. The three oxidation states of manganese（Mn3＋, Mn4＋ and Mn5＋） can stably exist in the compounds. Under room temperature conditions, twice and three times modulated structure produced by the charge ordering can be observed by X-ray diffraction（XRD）, select area electron diffraction（SAED） and high resolution transmission electron microscopy（HR-TEM）. The splits of the diffraction peaks of the single crystals confirmed by synchrotron X-ray diffraction experiment are in accordance with those of the powder sample. The existence of the different oxidation states of Mn3＋, Mn4＋ and Mn5＋ can be considered to be the dominating reason of the complicated room temperature modulated structure.

关键词： Modulated structure mixed valence state Room temperature

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