Phase formation and physicochemical properties of solid solutions Bi4–yTbyTi3O12 based on layered bismuth titanate

Resumo

The phase formation of solid solutions Bi_4–yTb_yTi₃O₁₂, where y = 0.0, 0.2, 0.4, 0.6, and 0.8, was studied, and a scheme of this process in an oxide reaction mixture was proposed. The thermal stability of the obtained solid solutions was investigated, and the phase composition and structural parameters were explored in detail by the Rietveld method. It was found that, within the tested concentration range, Bi_4–yTb_yTi₃O₁₂ samples crystallize in the orthorhombic system, and the concentration evolution of the unit cell parameters was traced. It was determined that the temperature of the ferroelectric phase transition decreases with increasing y, as the concentration limit of the existence of the rhombic modification of Bi_4–yTb_yTi₃O₁₂ is approached.