Synthesis, characterisation and dielectric properties of low-loss Zr-doped barium strontium titanate materials

Abstract

A series of materials of the composition Ba 0.7 Sr 0.3 Zr x Ti (1 − x) O 3 (BSZT), where x = 0.00, 0.01, 0.02 and 0.03, were synthesised through the sol-gel method whereupon the manifestations of partial substitution of Ti 4+ by Zr 4+ on the structural and dielectric behaviour of Ba 0.7 Sr 0.3 TiO 3 (BST) were studied. X-ray diffraction patterns of all samples showed the development of a single-phase crystalline perovskite structure. The dielectric behaviour of the ceramic samples has been studied in detail in the frequency range 10 Hz to 1 MHz at room temperature, and as a function of increase in temperature. The sample with 2% Zr recorded the highest dielectric constant. The dielectric loss values for all the BSZT compositions are remarkably low, tan δ = 0.021∼0.026 at 1 MHz, in contrast to the literature reports. It is observed that small amount of Zr doping on BST, where 0 < x ≤ 0.03 results in the enhancement of dielectric constant while decreasing the bulk density and dielectric loss.

Temperature Stable Dielectric Properties in BaTiO3–Bi(Mg2/3Nb1/3)O3–NaNbO3 Solid Solution

“…A dip in the pure tetragonal‐BT is always found near 180 cm −1 which indicates the ferroelectric behavior, which was not observed in present case, indicating the formation of paraelectric phase; however, broadening in the peak ∼300 cm −1 was found which indicates that there is no long‐range ferroelectric order because a sharp peak is generally observed in tetragonal‐BT as reported . The broad bands near 508 and 573 cm −1 tend to diffuse with increase in x which may be due to decreasing concentration of Mg 2+ which is due to decreasing concentration of MgO 6 octahedra . It was also reported that the Raman active mode at 770 cm −1 , associated to the breathing of BO 6 octahedra .…”

Synthesis of functionalized ZnO nanoflake loaded polyvinylidene fluoride composites with enhanced energy storage properties

“…However, these dipoles do not get appreciable time for alignment at high frequency, and only electronic polarization prevails under higher frequency regions (1KHz‐10 MHz). [ 33 ] Thus, the plot of dielectric constant (ɛ) and dielectric loss (tanδ) exhibits decreasing trend with increasing frequency. Here, lower loading of ZnO@APTES (30 vol%) produces the highest dielectric constant around 34.53 with low tanδ of 0.13.…”

Thermal, mechanical, and dielectric properties of low loss PbZr0.3Ti0.7O3/polystyrene composites prepared by hot‐press method

“…[ 26 ] A weak band at 1430 cm −1 pertains to ‐COOH, from the remnants of organic matter in the sol‐gel derived powders. [ 27 ] In the spectra of pure PS and the different formulated PZT/PS composites, the absorption peaks in the 2800‐3100 cm −1 range are attributed to the C‐H stretching vibrations in the benzene rings. The aromatic C=C vibrations show corresponding peaks at 1601, 1492, and 1451 cm −1 .…”