Synthesis of spin-ladder Sr₁₄Cu₂₄O₄₁ material by citrates sol-gel method

Abstract

A new process to synthesize polycrystalline samples of Sr₁₄Cu₂₄O₄₁ was presented. Firstly, dry gel powder of Sr₁₄Cu₂₄O₄₁ was 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 Sr₁₄Cu₂₄O₄₁ 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 °C. 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 _ρ. in the Arrhenius plot of the resistivity versus temprature.

Keywords

citrates sol-gel / solid-state reaction / Sr₁₄Cu₂₄O₄₁ / spin ladder

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