Synthesis of a new 0.6PZS-0.4PLZT ceramics system, sintering and Microstructure properties characterization

The composition of 0.6PZS-0.4PLZT system was 0.6Pb (Zn1/3, Sb2/3) O3-0.4Pb0.98La0.02 (Zr0.48, Ti0.52) O3 were synthesized by a solid mixed-oxide solution method. The specific weight and porosity of the sintered component was measured from its mass and dimensions. The phase development and the lattice parameters of the sintered samples at 1050°C and 1200°C were analyzed and estimate by X-ray diffraction (XRD) (High score) and Celref software . The microstructure properties and morphology were characterized by scanning electron microscopy (SEM). The increasing in sintering temperature from 1050°C to 1200°C causes change for compound formation from Pb2Sb2O7 with cubic phase structure (FD3M) ,a= 10,4825°A; to another compound Zn2.3Sb0.67O4 with cubic phase structure (FD3M) ,a= 8,5354°A and slightly porous morphology

Sintering and Properties of Pb0.98Ca0.02 [(Zr0.52Ti0.48)0,98(Cr3+0.5, Ta5+0.5)0,02] O3 Ferroelectric Ceramics Doped with P2O5

AbstractThe effect of phosphorus additions on the structure, microstructure and dielectrics properties of the Pb0.98Ca0.02[(Zr0.52Ti0.48)0,98(Cr3+0.5, Ta5+0.5)0,02]1-xPx O3 (x ranged from 0.01 to 0.12) ceramics have been investigated. All of the samples were prepared by a high-temperature solid-state reaction technique. AFM analysis of the compounds suggests that the average grain size increases with increasing sintering temperature which is characteristic of a ceramic material. Until that it reaches maximum values for the simple doped with 4 Wt. % of P2O5 at a sintering temperature of 1050°C. Dielectric studies of the compounds as a function of frequency (from 1 to 200 KHz) sintered at different sintering temperatures (1000, 1050, 1100, 1150 and 1180° C) show that the compounds undergo a phase transition of diffuse type. The transition temperature shifts towards higher side with increase in frequency a typical characteristic of a relaxor material

Effects of Zr/Ti ratio and sintering temperature on Structural and electrical properties of PFN-PNN-PZTceramics near the morphotropic phase boundary

0.05Pb[Fe1/2 Nb1/2]O3-0.05Pb[Ni1/3Nb2/3]O3-0.90Pb[ZrxTi(1-x)]O3 [PFN-PNN-PZT] quaternary piezoelectric ceramics with varying Zr/Ti ratios located near the morphotropic phase boundary (MPB) were prepared by a conventional mixed-oxide route. The samples structure was determined by X-ray diffractometry which indicate that the phase structure, of sintered PFN-PNN-PZT ceramics, was transformed from tetragonal to rhombohedral with Zr/Ti ratio increased in system. The effect of Zr/Ti ratio and sintering temperature on the structure and piezoelectric properties of our simples were investigated. The new MPB in this quaternary system with optimum piezoelectric properties was found at x = 0.51-0.53. The dependence of the piezoelectric coefficient (d31), electromechanical coupling factor (kp) and the dielectric constant (ε) on the Zr/Ti ratio shows a pronounced  maximum of d31 = 141* 10-12 C/N, kp= 0.64 and ε = 850 at Zr/Ti : 51/49. As the Zr/Ti ratio increases, the Tcof PFN-PNN-PZT ceramics decreases and consequently the peak in the dielectric spectrum corresponding to the Tc moves towards room temperature. A Tc of 360 °C is obtained when Zr/Ti: 51/49

Synthesis and characterization of biocomposites based polypropylene/thermoplastic starch- reinforced with natural STIPA TENACISSIMA fibers and PP-g-MA

The current work aims to develop environmentally friendly plastic materials by preparing a composite polypropylene/thermoplastic starch (PP/TPS) using a melt-compounding process. In order to improve the compatibility of the two naturally incompatible polymers, natural Stipa tenacissima fibers treated on their surfaces and polypropylene (PP) pellets grafted with Maleic Anhydride (MA) were added to the mixture (PP and TPS). The mixture was then prepared using the melt-mixing method in various concentrations. X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA)/Differential thermal analysis (DTA), and mechanical tensile tests were then used to characterize the various formulations. SEM images revealed that the addition of (PP-g-MA) and natural fibers resulted in good starch plasticization and higher thermoplastic starch dispersion in the polypropylene matrix. It was also discovered that increasing the TPS concentration over the PP concentration tends to reduce the mechanical tensile properties. However, the composite with 15% TPS had the best mechanical properties. The thermogravimetric analysis (TGA) results revealed that the organic filler used acted as a reinforcing agent, increasing the thermal stability of the polypropylene/thermoplastic starch (PP/TPS) compound

The Steps Of Forming Of Solid Solution Noted (PZT-PSN-YMN) And Structural Characterization Of These Ceramic Materials

This work is aimed to synthesize nano ceramic material of general formula short PZT-PSN-YMN of structure perovskite near the morphotropic phase boundary. These ceramics worked out by solid way, we present the preparation and the different stages of reaction mechanism of formation. Then we will detail the different techniques of analysis applied to this compound; we begin by the X-ray diffraction in the following by analysis spectroscopic (FTIR), laser particle size distribution and analysis by scanning electron microscopy (SEM).. These studies help us to accumulate as much information on the microstructure, the average particle size for all materials studied ceramic is less than 0.1μm. this value decreases after the heat treatment , beginning of forming the phase : PbTiO3 from the calcination temperature 450 ° C ,PbZrO3  from the calcination temperature 550 ° C and the formation and stabilization of the solid solution Pb(Ti,Zr)O3 noted PZT at the temperature 900 °C.

EFFECT OF COMPOSITION ON CHARACTERISTICS OF NEW CERAMIC PZT PREPARED BY MIXED-OXIDE METHOD

Les compositions avec le rapport variable de Zr/Ti dans le système Pb [ZryTiX (Cr0.2, Zn0.2, Sb0.6) z] avec (x + y + z) = 100%, 30 %≤ x ≤ 42% et  y constant à 20%  ont été préparées par la méthode conventionnelle d'oxydes mixtes. Les caractérisations de ces céramiques PZT ont été réalisées par DRX et MEB. La diffraction des rayons x est présentée pour démontrer la coexistence des phases tétragonale et rhomboédrique. La microscopie électronique à balayage (MEB) a montré une augmentation de la taille moyenne des grains simultanément avec l’augmentation de la température de frittage. Les céramiques frittées à 1180 ° C avec Ti = 42% ont d' importantes propriétés diélectriques, qui sont comme suit εr = 4262.48, et la résistivité ρ = 5,079 * 106 Ω.cm

SYNTHESIS AND MICROSTRUCTURES STYDY OF ANTIMONY AND NICKEL-DOPED BISMUTH SODIUM TITANATE ZIRCONATE CERMICS

Les céramiques (Na0.5 ,Bi0.5) (Ti0,8 Zr0,2) 1-x (Sb2 / 3, Ni1 / 3) xO3 (NBTZSN) avec x = 0.05 et 0.1 ont été synthétisées en utilisant une réaction à l'état solide à haute température technique. La technique de diffraction des rayons X (XRD), le FTIR et la microscopie électronique à balayage (SEM) ont été utilisés pour étudier les propriétés structurelles des composés, respectivement. L'étude XRD a confirmé la formation d'un composé polycristallin monophasé avec une structure cristalline tétragonale et une minorité de phase pyrochlore à température ambiante. L'analyse microstructurelle de la surface des composés montre qu'il y a un changement dans la taille et la densité des grains lors de l'introduction de (Sb) et (Ni) dans (NBTZ)

Physical Properties of Ternary NaPO3-KHSO4-MX (M=Na, K and X=Cl, Br) Glasses

AbstractThis contribution focusses on some thermal, optical and mechanical properties of sulfophosphate glasses containing MX (M=Na, K and X=Cl, Br) synthesized in the NaPO3- KHSO4- MX systems. The synthesized samples of 1cm in thickness present large vitreous areas. These glasses are stable at room atmosphere and soluble in water. Characteristic temperatures of glass transition and onset of crystallization were measured. The temperature of glass transition and the coefficient of thermal expansion range between 180 and 254°C and between 217.10-7 k-1 and 270.10-7k-1, respectively. Refractive index of all the samples is found is close to 1.48 in the 633-1555nm wavelength range. The micro hardness and the elastic moduli of the samples were also measured