Pub Date : 2013-01-01DOI: 10.3969/J.ISSN.1001-4861.2013.00.155
Xu Jiahuan, X. Jun, Ye Qin, Guo Yin-tao
Novel Sr-and Co-codoped(Pr,Sr)(Al,Co)O3-δ perovskite oxide conducting ceramics were prepared by citrate process combined with subsequent high-temperature sintering.The phase composition,microstructure and electrical properties of the obtained ceramics were characterized by XRD,SEM and direct current four-wire method.The experimental results show that all the as-prepared Pr0.9Sr0.1Al1-yCoyO3-δ(y=0.1~0.5) ceramics are a single-phase rhombohedral perovskite structure,and their unit cell volumes,relative densities and electrical conductivities increase with increasing y in the doping range,while the increasing rate in electrical conductivity progressively decrease.Furthermore,these samples are a mixed conductor of oxygen ion and hole in air and their electrical conductivities are absolutely dominated by p-type conduction.The temperature dependence of electrical conductivity for Pr0.9Sr0.1Al1-yCoyO3-δ can be described by the small polaron hopping mechanism.For the as-prepared Pr1-xSrxAl0.5Co0.5O3-δ(x=0.1~0.4) ceramics,a second phase(Pr,Sr)CoO3obviously precipitates when x=0.2,indicating that the solid solubility limit of Sr on A site in this system is between 10at% and 20at%,and the(Pr,Sr)CoO3phase in samples increases gradually and finally becomes the main phase with further increase in Sr content.It is found that the electrical conductivity of Pr1-xSrxAl0.5Co0.5O3-δ ceramics roughly exhibits a trend of first increase and then decrease with increasing x in the whole examined temperature range,and reaches the maximum value at around x= 0.3.Additionally,the semiconductor-to-metal transition in the conduction behavior is obviously observed for the samples with x≥0.2,and the transition temperature gradually decreases with increasing Sr content.
{"title":"Effect of Strontium and Cobalt Co-doping on the Structural and Electrical Properties of PrAlO_3 Perovskite Oxides","authors":"Xu Jiahuan, X. Jun, Ye Qin, Guo Yin-tao","doi":"10.3969/J.ISSN.1001-4861.2013.00.155","DOIUrl":"https://doi.org/10.3969/J.ISSN.1001-4861.2013.00.155","url":null,"abstract":"Novel Sr-and Co-codoped(Pr,Sr)(Al,Co)O3-δ perovskite oxide conducting ceramics were prepared by citrate process combined with subsequent high-temperature sintering.The phase composition,microstructure and electrical properties of the obtained ceramics were characterized by XRD,SEM and direct current four-wire method.The experimental results show that all the as-prepared Pr0.9Sr0.1Al1-yCoyO3-δ(y=0.1~0.5) ceramics are a single-phase rhombohedral perovskite structure,and their unit cell volumes,relative densities and electrical conductivities increase with increasing y in the doping range,while the increasing rate in electrical conductivity progressively decrease.Furthermore,these samples are a mixed conductor of oxygen ion and hole in air and their electrical conductivities are absolutely dominated by p-type conduction.The temperature dependence of electrical conductivity for Pr0.9Sr0.1Al1-yCoyO3-δ can be described by the small polaron hopping mechanism.For the as-prepared Pr1-xSrxAl0.5Co0.5O3-δ(x=0.1~0.4) ceramics,a second phase(Pr,Sr)CoO3obviously precipitates when x=0.2,indicating that the solid solubility limit of Sr on A site in this system is between 10at% and 20at%,and the(Pr,Sr)CoO3phase in samples increases gradually and finally becomes the main phase with further increase in Sr content.It is found that the electrical conductivity of Pr1-xSrxAl0.5Co0.5O3-δ ceramics roughly exhibits a trend of first increase and then decrease with increasing x in the whole examined temperature range,and reaches the maximum value at around x= 0.3.Additionally,the semiconductor-to-metal transition in the conduction behavior is obviously observed for the samples with x≥0.2,and the transition temperature gradually decreases with increasing Sr content.","PeriodicalId":9986,"journal":{"name":"无机化学学报","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90481170","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-01-01DOI: 10.3969/J.ISSN.1001-4861.2013.00.220
Liao Hua, Kuang Zhi, F. Lan, L. M. Qin, Tang Ping, Deng Hong
{"title":"Preparation of TNP Electrochemical Sensor Based on Silver Nanoparticles/Graphene Oxide Nanocomposite","authors":"Liao Hua, Kuang Zhi, F. Lan, L. M. Qin, Tang Ping, Deng Hong","doi":"10.3969/J.ISSN.1001-4861.2013.00.220","DOIUrl":"https://doi.org/10.3969/J.ISSN.1001-4861.2013.00.220","url":null,"abstract":"","PeriodicalId":9986,"journal":{"name":"无机化学学报","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84280403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
One-and two-dimensional tungsten oxide nanostructures were synthesized by solvothermal method using tungsten hexachloride(WCl6) as the precursor.The effects of the solvent and the concentration of WCl6 on the phase and the morphology of the as-synthesized tungsten oxide nanostructures were investigated and the NO2-sensing properties were evaluated.X-ray diffraction,field emission scanning electron microscope,transmission electron microscope,X-ray photoelectron spectroscopy were employed to characterize the as-synthesized products and the results indicate that the W18O49 nanorod,W18O49 nanowire and WO3 nanosheet with monoclinic structure can be formed by adjusting the solvent and WCl6 concentration.The NO2-sensing properties measurements show that the synthesized tungsten oxides have reversible response to NO2 at different concentrations.In comparison with WO3 nanosheet or W18O49 nanorod,the W18O49 nanowire exhibits much higher response to NO2 gas.
{"title":"Synthesis and characterization of tungsten oxide nanostructures","authors":"Rong Hu, 胡蓉","doi":"10.5353/th_b4150877","DOIUrl":"https://doi.org/10.5353/th_b4150877","url":null,"abstract":"One-and two-dimensional tungsten oxide nanostructures were synthesized by solvothermal method using tungsten hexachloride(WCl6) as the precursor.The effects of the solvent and the concentration of WCl6 on the phase and the morphology of the as-synthesized tungsten oxide nanostructures were investigated and the NO2-sensing properties were evaluated.X-ray diffraction,field emission scanning electron microscope,transmission electron microscope,X-ray photoelectron spectroscopy were employed to characterize the as-synthesized products and the results indicate that the W18O49 nanorod,W18O49 nanowire and WO3 nanosheet with monoclinic structure can be formed by adjusting the solvent and WCl6 concentration.The NO2-sensing properties measurements show that the synthesized tungsten oxides have reversible response to NO2 at different concentrations.In comparison with WO3 nanosheet or W18O49 nanorod,the W18O49 nanowire exhibits much higher response to NO2 gas.","PeriodicalId":9986,"journal":{"name":"无机化学学报","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2008-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85492207","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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