Features of sol-gel synthesis of new functional materials based on complex oxides with tunnel structure

摘要

A new method of sol-gel synthesis has been proposed for fabrication of functional materials with ramsdellite and hollandite types of crystal structure in the following oxide systems: Me2O-Me'2O3-Me"O2 (Me = Li, K; Me' = Ga, Cr, Fe, In; Me" = Ti, Sn). The formation of titanates with ramsdeUite-type structure is shown to achieve at the temperature range of 250-650 °C, when gel combustion occurs. This allows fabrication of materials with high specific surface area. The ramsdellite phases and stannate hollandites are shown to form in the temperature range of 1,100-1,150 °C. Thus our method gives the possibility to reduce the thermo-temporal parameters of synthesis for this class of materials.