Archives of Metallurgy and Materials

Abstract

In this paper, explain the preparation of CaTiO 3 ceramics synthesized by the solid-state reaction method. Calcium carbonate and titanium dioxide were high energy mixed in stoichiometric amounts, and the obtained mixture was calcined at different temperatures (800, 900, 1000 and 1300ºC) for 2 h. The obtained samples were characterized by measurement of particle size, Energy Dispersive X-Ray (EDX) Analysis; differential thermal analysis, X-ray diffraction and SEM images. XRD patterns indicated that CaTiO 3 ceramics with the structure of perovskite is obtained from calcined powders at 1,300°C for 2 h. SEM images show the formation of a very fine and homogeneous morphology. The measured values of electrical resistivity were within the typical range of insulating materials and approach values corresponding to insulating ceramics.

ELECTRONIC STATES DENSITY, RESISTIVITY, AND PHASE COMPOSITION OF CaTiO3 PEROVSKITE WITH ISOMORPHIC IMPURITY OF NIOBIUM

“…In its pure perovskite form, CaTiO 3 is a dielectric, which is confirmed by resistivity measurements (ρ). The specific resistance of CaTiO 3 at 20 °C was 10 10 Ω • m [10], results from measurements of ρ at the same temperature in [27] showed a value of 1.9 • 10 10 Ω • m. It should also be noted that according to [16], pure rutile crystals of TiO 2 has a resistivity ρ = 10 4 -10 6 Ω • m, which is lowered to ρ = 10 -4 Ω • m by niobium and tantalum impurities. The resistivity value (ρ) of CaO changes from 10 5 to 10 2 Ω • m within the temperature range of 400 °C to 1000 °C [15].…”

“…Calcium titanate (CaTiO 3 ) belongs to the group of perovskites having an orthorhombic crystal structure at room temperature, transitioning into a tetragonal and cubic crystal structure within the temperature range of 1200-1700 °C [31,8]. It finds utility as a die-lectric or ferroelectric material in radio en gineering and electronic industries [10,27]. Article [24] mentions that CaTiO 3 is also used for immobilization of radioactive waste.…”