Hollow tubular potassium magnesium titanate with high thermal stability

Hollow tubular potassium magnesium titanate (KMTO) were synthesized using Mg(OH)2, TiO(OH)2 and K2CO3 as the raw materials and KCl as the flux. We studied the thermal stability of the KMTO and the reflectivity in the near-infrared wavelength range of KMTO treated at different temperatures. The results indicated that hollow tubular KMTO powders 4-15 μm in length and 1-2 μm in diameter could be obtained after being calclined at 850 °C for 2 h. The resulting KMTO powders had good thermal stability in structure and near-infrared reflectivity. Only a small amount of KMTO decomposed into MgTi2O5 and TiO2 when the as-calcined powders were post heat-treated at 1500 °C. Moreover, the high temperature treatment had only a minor effect on the high near-infrared reflectivities of KMTO. The results indicated that the prepared KMTO exhibited excellent thermal stability.