Structural, Dielectric and Electrical Properties of (1-x)CaCu3Ti4O12−xBaTiO3 Ceramics

Abstract

In this work, the effect of BaTiO3 (BT) addition on structural, dielectric and electrical properties of CaCu3Ti4O12 (CCTO) ceramic was investigated. Ceramic samples with the chemical formula (1-x)CaCu3Ti4O12 -xBaTiO3, (1-x)CCTO-xBT, (x = 0.00, 0.10, 0.20, 0.30, 0.50 and 1.00) were synthesized by solid state route. The structural studies carried out by X-ray diffraction technique and showed that the perovskite structure cubic and tetragonal phases were formed without any other impurity phases. The addition of BaTiO3 into CCTO system lowered the last crystallite size to about 52 nm and increased the dielectric constant by four orders compared to pure CCTO. Moreover, the results of the complex impedance analyses of (1-x)CCTO-xBT ceramics samples confirmed the presence of non-Debye type of relaxation phenomenon and exhibited a negative temperature coefficient of resistance behaviour.Keywords: Ceramics, Barium titanate, Raman spectroscopy. Chemistry; Vol. 29, No. 8 (2017), 1811-1816 a mixture CCTO and BaTiO3 characteristics. In the present work we are reporting the synthesis of (1-x)CCTO-xBT by solid state reaction route. The structural, dielectric and electrical properties of (1-x)CaCu3Ti4O12-xBaTiO3 ceramics (where x = 0.00-1.00) were investigated. Asian Journal of EXPERIMENTALThe (1-x)CCTO-(x)BT samples were synthesized by means of a conventional mixed oxide route. High-purity oxides and carbonates; CaCO 3 (99.8 %) CuO (purity, 99 %), TiO 2 (purity, 99.95 %) and BaCO 3 (purity 99.5 %) (All Sigma Aldrich chemicals, USA) were used as starting materials.Synthesis of (1-x)CaCu 3 Ti 4 O 12− − − − −xBaTiO 3 : The powders were weighed in stoichiometric proportion and milled for 1 h. Then the slurry was dried in an oven at 80 °C. The calcinations processes of CCTO and BaTiO 3 powders were carried at 1050°Cand 1100 °C for 4 h, respectively. The synthesized powders were mixed in acetone according to the formula (1-x)CCTO-(x)BT for 2 h and dried at 400 °C for 1 h, after that the powders were crushed in agate mortar and pressed into pellets of about 12 mm diameter and 1.5 mm thickness. Then, the pellets sintered at 1050°C for 8 h and left at room temperature. The samples surfaces were coated by silver paste to serve as poles for the electrical measurements uses. Characterization of (1-x)CaCu3Ti4O12− − − − −xBaTiO3XRD analysis: The crystal structure of (1-x)CCTO-xBT was determined by using an X-ray diffractometer with a scanning rate of 0.02°/min for 2θ range 20°-80° by employing CuKα radiation wavelength λ = 1.5406 Å (diffractometer system = XPERT-PRO) under the conditions of 40 KV and 30 mA.Raman spectroscopy analysis: A micro Raman spectrometer, equipped with an excitation source of monochromatic with wavelength of 410 nm, was used to study the relationship between Raman lines and different types of atomic motions of CCTO and BaTiO3 in the (1-x)CCTO-xBT ceramics. After the sample processing, Raman spectra was collected at room temperature.Dielectric measurements analysis: The electrical properties of the ceramics were measu...

The effects of calcination and doping on structural and dielectric properties of CaCu3-xCoxTi4O12 ceramic

“…Rietveld analysis confirms the formation of the pure bodycentred cubic perovskite-related structure of space group Im3 and the unit cell parameters were calculated. The lattice parameters obtained of pure CCC 0.00 TO at 950 0 C and CCC 0.00 TO at 1050 0 C (Table 1) are in good agreement with those reported in literature 7,8 , Rietveld refinement results show that the crystal structure and lattice parameters do not change when the temperature of calcination changes from 950 °C to 1050 0 C for 4 h.…”

“…CCTO exhibits a combination of high permittivity and modest dielectric loss. It has been extensively investigated for their temperature independent dielectric permittivity without a ferroelectric transition over a large temperature range 1,[7][8][9] . These investigations concern the origin of the huge dielectric permittivity.…”

STUDY OF THE DIELECTRIC AND MICROSTRUCTURE PROPERTIES OF (1-x) CaCu3TI4O12 – (x) PbZr0.65Ti0.35O3 COMPOSITE

“…Almeida et al [7] investigated the properties of the composite BaTiO3-CCTO film and its potential use as antennas and microdevices. In an analogous previous work, N. Hadi et al [8] investigated the stability of the perovskite phase and the dielectric properties in the (1-x)CCTOxBaTiO 3 ceramic (CCTO and BaTiO 3 perovskites), the value of dielectric constant was about 56,000 …”

Study of the dielectric, optical and microstructure properties of CaCu3Ti4O12–PbZr0.48Ti0.52O3 ceramic system with different compositions

“…Among those efforts, extensive studies of the formation of perovskite oxides of the systems Ca 1-x M x Ti 1-x M x O 3 (M = Cu, Y, Sr, Ba, Pb, Zr, Co, Al, Fe, Li, Cr) were performed as attempts to improve the properties of ceramic materials 8 . At present, research work has begun on the basis of the idea of integrating ceramic materials, among them; Almeida et al 9 , they studied the properties of the composite (1-x)BaTiO 3 -xCCTO film (x=0.00,0.50 and 1.00), N. Hadi et al 10 investigated the dielectric properties of the (1x)CCTO-xBaTiO 3 composites. In an analogous previous work 11 , we investigated the properties of the (1-x)CCTO-xPZT composite ceramics with a ratio Zr/Ti = 65/35, beyond the morphotropic phase and for which PZT presents a tetragonal phase.…”