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

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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 ramsdellite-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.