Structure,microstructure,dielectric and piezoelectric properties of(1−x-y)BiFeO_(3)-xPbFe_(0.5)Nb_(0.5)O_(3)-yPbTiO_(3)ceramics

Ceramics of quasi-binary concentration section(x=0.50,0.1≤y≤0.2,Δy=0.025)of the ternary solid solution system(1−x−y)BiFeO_(3)-xPbFe_(0.5)Nb_(0.5)O_(3)-yPbTiO_(3)were prepared by the conventional solid-phase reaction method.By using X-ray diffraction technique,the phase diagram of the system was constructed,which was shown to contain the regions of cubic and tetragonal symmetry and the morphotropic phase boundary between them.Grain morphology,dielectric and piezoelectric proper­ties of the selected solid solutions were investigated.The highest piezoelectric coefficient d_(33)=260 pC/N was obtained.Dielectric characteristics of ceramics revealed ferroelectric relaxor behavior,a region of diffuse phase transition from the paraelectric to ferroelectric phase in the temperature range of 350-500 K.

The influence of thermodynamic history and external influences on the electrophysical properties of ferropiezoceramic materials based on a multicomponent system PZT-PMN-PZN+SiO_(2)

This paper presents the results of a comprehensive study of the industrially produced ferro-piezoelectric ceramic material based on the PbZrO_(3)-PbTiO_(3)-PbMn_(1/3)Nb_(2/3)O_(3)-PbZn_(1/3)Nb_(2/3)O_(3)+SiO_(2)system.Studies have confirmed that this material refers to ferrorigid materials with high coercive fields,stable dielectric properties in a wide temperature range,practically no Curie temperature hysteresis,as well as low controllability of the dielectric constant and deformation characteristics by constant bias electric fields.The revealed correlation between dielectric,deformation characteristics and dielectric hysteresis allows us to consider this material as promising for devices operating in power modes:piezotransformers,highly loaded ultrasonic devices,piezoelectric motors,etc.

Obtaining,structure,microstructure and dielectric characteristics of ceramics and thin films of ferro-piezoelectric materials based on the PZT system

This paper presents the results of studies of the structure,microstructure,dependences of the piezoelectric properties on the electric field(dielectric hysteresis loops,reversible nonlinearity,deformation characteristics)and dielectric properties of the ceramic material PCR-13(based on the PZT system)in the temperature range 300-900K and frequencies of an alternating electric field(25÷2·10^(6))Hz.The character of the obtained dependences made it possible to attribute PCR-13 to ferro-hard materials.Using the HF cathodic sputtering method,PCR-13 thin films were fabricated on Si(001)substrates.It is shown that they are polycrystalline textured,while in comparison with bulk material,the film contains tensile stresses of the unit cell in the plane of the substrate and compresses in the perpendicular direction with the valueε_(33)=-0.018.The capacitance-voltage characteristics of the Al/PCR-13/Si/Al heterostructure were studied.The reasons for the revealed patterns are discussed.

Crystal structure,microstructure,electrophysical properties,and thermally induced aging of PZT-CdNb_(2)O_(6)ceramics

Solid solution samples of the three-component system(1−x)Pb(Ti_(0.5)Zr_(0.5))O_(3)−xCdNb_(2)O_(6)with x=0.0125-0.0500,Δx=0.0125 were obtained by solid phase synthesis followed by sintering using conventional ceramic technology.The crystal structure,microstructure,electrophysical,and thermophysical properties of these ceramics have been studied.It is shown that all studied solid solutions can be divided into two groups(with x=0.0125 and with x>0.0125),characterized by different characteristics of the change in properties with variations in external influences.This is probably due to the transition from a perovskite-type structure with a tetragonal(T)unit cell to inhomogeneous solid solutions consisting of a series of T-phases with similar cell parameters.A conclusion is made about the expediency of using the data obtained in the development of similar materials for devices based on them.

Microstructure features of the BST/(Mg,Ln)-ceramic

Solid solutions of the composition Ba_(1-x-y)(Mg,Ln)_(x)SryTiO_(3)(x=0.01;0.025;0.04;y=0.20;0.50;0.80;Ln=La,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Ho,Er,Tu,Yb)were prepared by two-stage solid-phase synthesis followed by sintering using conventional ceramic technology.The influence of rare-earth elements on the microstructure of the prepared ceramic samples was investigated.It was found that regardless of the type of modifiers introduced,the grain landscape of the studied solid solutions with different amounts of SrTiO_(3)is refined(in the initial system,the average grain size,d,at x=0.20 is 6μm;at x=0.50 is 4μm;at x=0.80 is 18μm)to crystallite sizes not exceeding(2-3)μm,and compacted.The using of mechanical activation procedures leads to an even greater decrease in the size and an increase in the density of ceramics.The increasing in the concentration of modifiers in each group(within the considered range of dopant variation)against the background of such a fine-grained structure has little effect on the dynamics of changes in d.It is concluded that it is advisable to use the data obtained in the development of functional materials based on BST/(Mg,Ln)and devices with the participation of these compositions.