Hydrothermal Synthesis of Oxide and Carbonate Powders of (1-x)(Na0.5Bi0.5)TiO3-xBaTiO3 Ceramics

Mesrar, M.; Lamcharfi, T.; Echatoui, Nor-Said; Abdi, Farid; Ahjyaje, Fatima Zahra

doi:10.14233/ajchem.2019.21581

Cited by 11 publications

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“…Average grain size increases without the solute drag effect as the amount of Bi 2 O 3 increases, as shown in Figure 2. Most previous studies investigated the electrical properties in the NBT-5BT system; however, they focused on the effect of processing parameters such as synthesis methods [36,[44][45][46], sintering temperature, morphotropic phase boundary (MPB) [47,48], and amounts of additive elements [37,49] on the microstructure and dielectric properties. A previous study [37] investigated the effect of adding Bi 2 O 3 on microstructure and dielectric-temperature curves.…”

Section: Resultsmentioning

confidence: 99%

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Grain Growth Behavior of 0.95(Na0.5Bi0.5)TiO3–0.05BaTiO3 Controlled by Grain Shape and Second Phase

et al. 2020

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The grain growth behavior of 0.95(Na0.5Bi0.5)TiO3 –0.05BaTiO3 (mole fraction, NBT–5BT) grains was investigated with excess Bi2O3 addition. The powder compacts of NBT–5BT were sintered at 1200 °C for various sintering times and with various amounts of Bi2O3 (0.1, 1.5, 4.0 and 10.0 mol%). When Bi2O3 was added to round-edged cubic NBT–5BT, the grain shape changed to a more faceted cube and the amount of liquid phase increased during sintering. A more faceted cubic grain shape indicates an increase in the critical driving force for appreciable growth of grains. However, obvious abnormal grain growth did not appear in any of the NBT–5BT samples with excess Bi2O3. The amount of liquid phase increased as the amount of Bi2O3 increased. Therefore, the rate of grain growth could be decreased by the increasing the distance for the diffusion of atoms. These observations allowed us to conclude that the growth of Bi2O3-excess NBT–5BT grains is governed by the growth of facet planes via the two-dimensional nucleation grain growth mechanism during changing grain shape and amount of liquid.

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Section: Resultsmentioning

confidence: 99%

“…In addition, the secondary solid phase was formed by excess Bi 2 O 3 . In the NBT-5BT system, microstructural development such as changing grain size and densification is one of the important issues to enhance the electrical properties [35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Grain Growth Behavior of 0.95(Na0.5Bi0.5)TiO3–0.05BaTiO3 Controlled by Grain Shape and Second Phase

et al. 2020

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“…The first peak indicates the phase transition from ferroelectric to anti-ferroelectric 18,19 and the second peak represents anti-ferroelectric to a paraelectric phase transition 20,21 . Also, the dielectric peak at T m is frequency dispersive which implies a diffuse character for the coarse and medium-grained samples.…”

Section: Dielectric Characterizationmentioning

confidence: 99%

High dielectric constant of (1-x)(Na0.5Bi0.5)TiO3-xBaTiO3 prepared by the hydrothermal method

Mesrar¹,

Lamcharfi²,

Echatoui³

et al. 2019

Mediterr.J.Chem.,

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In this study, hydrothermal synthesis conditions for the formation of (1-x (Na 0.5 Bi 0.5)TiO 3-xBaTiO 3 (x=0; 0.03; 0.05; 0.06; 0.07; 0.08 and 0.1) compounds were investigated. The process parameters such as the alkaline conditions and heating treatment (temperature, time) as well the influence of the (Na, Bi)/Ba ratio were investigated in detail. The as-prepared NBT powders were characterized by X-ray powder diffraction, scanning electron microscope (SEM) and dielectric measurements. Taking into account NBT behavior draws consideration to phenomena of the ion ordering, coexistence of various phase regions in a crystal lattice, phase transition diffusion and a considerably new phenomenon: the existence of a very high dielectric constant at low frequency. Our result presents a simple preparation route for low-cost and high-purity.

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“…[1,2,3,4] Sodium bismuth titanate is characterised by having a rhombohedral perovskite structure with (a = 5,4884 Å and c = 13,5045 Å). [5,6] Relaxor ferroelectric materials represent a special class of disordered structures exhibiting a particular structure and properties. The structural characteristics of these relaxants are readily susceptible to modification by doping or by means of the appropriate dopants.…”

Section: Introductionmentioning

confidence: 99%

DIELECTRIC MEASUREMENTS AND IMPEDANCE SPECTROSCOPY OF Ba-MODIFIED (Na 0.5Bi0.5)TiO₃ PREPARED BY THE HYDROTHERMAL METHOD

Mesrar¹

2022

Ceramics - Silikaty

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1-x)(Na 0.5 Bi 0.5 )TiO 3-x BaTiO 3 , Rietveld refinement, Hydrothermal method, Nyquist impedance plot, Diffuse ferroelectric behaviour Sodium bismuth titanate (Na 0.5 Bi 0.5 )TiO 3 perovskite is presented as a lead-free concurrent for electro-ceramic engineering technologies. In this paper, (1-x)(Na 0.5 Bi 0.5 )TiO 3-x BaTiO 3 type ceramic materials were obtained by the hydrothermal process at a very low heat treatment temperature of around 200 °C and for times up to 24 hours. The structural, microstructural, and dielectric properties of the ceramic materials were investigated. The X-ray diffraction analysis confirms the formation of the rhombohedral phase of NBT with space group R3c. Based on the Rietveld refinement, the morphotropic phase boundary (MPB) was determined for the composition x (%) = 5 and 7. The grains increase in size from 11 to 23 µm and their distribution widens with an increasing barium concentration in the morphotropic phase boundary. The dielectric constants were measured from room temperature to 600 °C for various frequencies in the range of 1 kHz -2 MHz. From the Nyquist impedance plot, the effect of the grain and the grain boundaries on the electrical properties was studied. At high temperatures, the Uchino law modified by Echatoui et al. allows one to describe the thermal variation of the permittivity. This diffuse character is attributed to a cationic disorder due to the distribution of Na + /Bi 3+ and Ba 2+ ions in the A site.

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Hydrothermal Synthesis of Oxide and Carbonate Powders of (1-x)(Na0.5Bi0.5)TiO3-xBaTiO3 Ceramics

Cited by 11 publications

References 0 publications

Grain Growth Behavior of 0.95(Na0.5Bi0.5)TiO3–0.05BaTiO3 Controlled by Grain Shape and Second Phase

Grain Growth Behavior of 0.95(Na0.5Bi0.5)TiO3–0.05BaTiO3 Controlled by Grain Shape and Second Phase

High dielectric constant of (1-x)(Na0.5Bi0.5)TiO3-xBaTiO3 prepared by the hydrothermal method

DIELECTRIC MEASUREMENTS AND IMPEDANCE SPECTROSCOPY OF Ba-MODIFIED (Na 0.5Bi0.5)TiO₃ PREPARED BY THE HYDROTHERMAL METHOD

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