Influence of sodium dodecyl benzene sulfonate (SDBS) on the morphology and negative thermal expansion property of ZrW 2O 8 powders synthesized by hydrothermal method

Abstract

ZrW 2O 8 powders were prepared by hydrothermal thermal method using sodium dodecyl benzene sulfonate (SDBS) as surfactant. The products were investigated by X-ray diffraction (XRD) method, scanning electron microscopy (SEM), thermogravimetric and differential scanning calorimetry (TG–DSC) and Fourier transform infrared (FTIR) absorption spectra. Results indicate that the resulting powders are single cubic phase with high crystallinity. With increasing the amount of SDBS, morphology and particle size change from rod-like with an average dimension of 1.2 μm × 1.2 μm × 10 μm to layered column with an average diameter of 0.4 μm. ZrW 2O 8 powders exhibit negative thermal expansion property. And the amount of SDBS is not influence on the average thermal expansion coefficients. The thermal expansion coefficients are about similar with an average value of −5.8 × 10 −6 °C −1 from room temperature to 500 °C. However, the morphology has some effect on the thermal expansion coefficient of α-ZrW 2O 8.