Synthesis of Spin-ladder Sr₁₄Cu₂₄O₄₁Material by Citrates Sol-gel Method

WANG Lili~1 WEI Hui~1 HU Ni~1 XIONG Rui~(1*) YU Zuxing~1 TANG Wufeng~ SHI Jing~(1,2) (1.Key Laboratory of Acoustic & Photonic Material and Device,Ministry of Education,Wuhan 430072,China; 2.International Center for Materials Physics,Shenyang 110015,China)

摘 要：<正>A new process to synthesize polycrystalline samples of Sr₁₄Cu₂₄O₄₁was presented.Firstly,dry gel powder of Sr₁₄Cu₂₄O₄₁was synthesized by the citrates sol-gel method,using Sr（NO₃）₂,Cu（NO₃）₂,ethylene glycol and citrate acid as raw materials.Then,polycrystalline samples of Sr₁₄Cu₂₄O₄ l were prepared by solid- state reaction.Thermal Gravimetric and Differential Thermal Analysis（TG-DTA）showed that the temperature for solid-state reaction is at 942℃.The samples are identified to be single phase by X-ray Diffraction（XRD） and Scanning Electron Microscopy（SEM）.The SEM pictures showed that the first-step particles were at even size of about 100 nm by this technique.The electronic transport measurements showed that the doping compound were semiconductor with a crossover temperature T_p in the Arrhenius plot of the resistivity versus temprature.

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