The low-temperature synthesis of BiFeO_3-SrBi_2Nb_2O_9 complexes by sol-gel process

摘要

Nanocrystalline 0.1BiFeO_3-0.9SrBi_2Nb_2O_9 powder was successfully synthesized by a ethanolamine-modified sol-gel technique from compounds, Bi(TSTO_3)_3 centre dot 5H_2O, Sr(NO_3)_2, Fe(NO_3)_3 centre dot 9H_2O and Nb(OC_2H_5)_5 in solution ethylene glycol monomethyl ether. The powder exhibited amorphous in structure below annealing temperature 400 deg C and a pure phase of layered perovskite ferroelectric structure at annealing temperature 600 deg C. There was a considerable degree of particle coalescence when the xerogel was heated at 400 deg C. The grains exhibited spherical shape distribution, and the average particle size of powder was in the range 50-100 nm after annealing at 700 deg C. The ceramics exhibited a dense fracture surface consisting of lamellar grains.