| Strontium titanate powder is a kind of new functional powder material. It will applied widely because of its application superior to the traditional materials obviously in many fields. With the industry on the properties of SrTiO3functional materials have become increasingly requirement, the research of nano-SrTiO3is hot. After being doped, SrTiO3is widely used as protection components in the integration and miniaturization circuit because of its capacitor-varistor multifunction.In this paper, nano-SrTiO3powder has been successfully prepared by hydrothermal method. The research takes Ti (OC4H9)4and SrC12or Sr (NO3)2as raw materials to obtain precursor and NaOH as mineralizer. The exploring experiment has analyzed the influence factors such as the reaction type, reaction temperature, reaction time and stirring speed by the method of single variable. In the end, the samples are sent to view the powder crystal phase, grain size and morphology by XRD, SEM test analysis. The experimental results show that in the condition that the SrC12as Sr source hydrothermal reaction8h with the stirring speed360r/min at150℃, SrTiO3powder can be successfully prepared and the grain size is almost60nm.Further, taking the nano-SrTiO3to sinter at the range of1350-1450℃after doped and observing the structure characteristics of samples by SEM. Compare the electric performance parameters with SrTiO3varistor ceramics prepared by traditional solid preparation. In this paper, take0.6at%Nb2O5,0.2at%La2O3as double donor and0.6at%CuO,0.3at%CeO as double acceptor for doping nano-SrTiO3powder. The sample’s dielectric loss decreases obviously, the minimum value is lower than0.05; also the nonlinear coefficient increases sharply; and the breakdown voltage increases slightly, the dielectric constant can reach more than106. |
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