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1
Content available LMO Ceramics Microstructure
Bruś B., Zarycka A.
Archives of Metallurgy and Materials
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2016
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Vol. 61, iss. 2A
857--862
EN
The aim of this work was to characterize the microstructure of LMO type ceramics. The ceramics obtained by the free sintering at two temperatures 1473 K and 1573 K and two sintering times 6 and 12 h was the test material. One series was also obtained by the hot pressing method for a comparison. In all the cases the material synthesis was conducted by the solid-state reaction method at 1173 for 24 h. Photographs of the specimen fractures were taken by a scanning electron microscope to characterize the microstructure of the ceramics obtained in a more detailed way. The VISILOG 4 system, enabling to calculate a lot of parameters characterizing the material microstructure, such as e.g.: a number of grains on the unit area, an average grain size, shape indexes of the grains in question, was used as well. It allows determining a grain size distribution, and a frequency of presence of grains with the specific shape index. By analyzing a set of the parameters obtained an influence of the technological conditions on the microstructure of the material in question, and on its properties and applicability at the same time can be determined.
2
Content available Internal Friction in the PFN Ceramics with Chromium Dopand
Zachariasz R., Bochenek D., Bruś B.
Archives of Metallurgy and Materials
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2015
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Vol. 60, iss. 3A
1773--1776
EN
An aim of this work was to determine an influence of an admixture, the chromium (for x from 0.01 to 0.06), on the mechanical properties of the PFN ceramics. The ceramics with chemical composition Pb(Fe0.5−xCr
PL
W pracy przedstawiono wpływ domieszki chromu (dla x = 0,01 − 0,06) na właściwości mechaniczne ceramiki PFN. Ceramika o składzie chemicznym Pb(Fe0.5−xCr
3
Content available remote Fizyczne procesy odpowiedzialne za rozpraszanie energii w ceramice PFN
Bruś B., Zarycka A.
Materiały Ceramiczne
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2014
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T. 66, nr 3
298--301
PL
W pracy określono fizyczne procesy odpowiedzialne za rozpraszanie energii sprężystej drgań mechanicznych oraz określono wpływ domieszek twardych na tarcie wewnętrzne w ceramice PFN. Poznanie właściwości tych materiałów jest istotne z uwagi na ich szerokie zastosowanie, jako kondensatory, detektory piroelektryczne, czy przetworniki piezoelektryczne. Badany materiał stanowiły próbki ceramiki PFN, Pb(Fe0,5Nb0,5)O3, niedomieszkowanej i domieszkowanej chromem (1% - 3% Cr). W pomiarach właściwości mechanicznych wykorzystano metodę tarcia wewnętrznego (TW). Duże zainteresowanie tą metodą w badaniach rzeczywistej struktury materiałów ceramicznych spowodowane jest tym, że obserwując makroskopowe drgania próbki można uzyskać informacje o zachowaniu się materiału na poziomie atomowym. W pracy przedstawiono temperaturowe zależności tarcia wewnętrznego dla badanego multiferroika, otrzymane przy szybkości nagrzewania 3 K/min i przy różnych częstotliwościach pomiarowych. Opisano również wpływ zawartości chromu na właściwości mechaniczne badanej ceramiki takie jak dynamiczny moduł Younga i tarcie wewnętrzne w temperaturze pokojowej oraz w temperaturze przemiany fazowej.
EN
In the work, physical processes responsible for dispersing the elastic strain energy of mechanical pulses were determined as well as an influence of hard additives on the internal friction was determined in PFN ceramics. Getting to know the appropriateness of these materials is significant due to their wide applications, as condensers, piroelectric detectors, piezoelectric transducers. Samples of PFN ceramics were composed of Pb(Fe0.5Nb0.5)O3 material which was non-doped and doped with chromium (1-3 at.%). In measurements of mechanical properties, a method of the internal friction was used (TW). Great interest in this method in the research on the real structure of ceramic materials is caused by a fact that it is possible to obtain information about the behaviour of material on the atomic level by watching macroscopic pulses of the sample. In the work, temperature dependences of internal friction were described for the examined multiferroik ceramics that were received at a heating speed of 3 K/min and different frequencies. An influence of the chromium content on mechanical properties of inspected ceramics was also described, including dynamic Young’s modulus and internal friction both at room temperature and at a temperature of the phase transition.
4
Content available remote Wpływ mikrostruktury ceramiki PZT na właściwości dielektryczne i piezoelektryczne
Bruś B., Zarycka A.
Materiały Ceramiczne
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2010
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T. 62, nr 1
28-31
PL
Celem pracy było pokazanie wpływu mikrostruktury ceramiki na jej właściwości dielektryczne i piezoelektryczne. W pracy przedstawiono analizę mikrostruktury ceramiki PZT domieszkowanej kadmem i wolframem. Materiał badań otrzymano na drodze syntezy metodą reakcji w fazie stałej oraz zagęszczania dwoma metodami: metodą spiekania swobodnego oraz metodą prasowania na gorąco. Analizy mikrostruktury dokonano na podstawie zdjęć wykonanych za pomocą mikroskopu skaningowego Hitachi S-4700. Do obliczenia średniego rozmiaru ziaren oraz określenia jednorodności rozmiaru ziaren wykorzystano system VISILOG 4. Przedstawiono również rezultaty pomiarów parametrów dielektrycznych (przenikalności elektrycznej i tangensa kąta strat dielektrycznych) oraz piezoelektrycznych (współczynnika sprzężenia elektromechanicznego, modułu piezoelektrycznego). Parametry piezoelektryczne wyznaczono metodą rezonansu-antyrezonansu. Przeprowadzono analizę wpływu gęstości, porowatości, wielkości ziarna i jednorodności wielkości ziaren na parametry dielektryczne i piezoelektryczne.
EN
The aim of this work was to show the influence of the microstructure on dielectric and piezoelectric properties of the PZT ceramics. The analysis of the microstructure of PZT type ceramics containing cadmium and tungsten was presented. The studied material was obtained by the solid state synthesis. The pressureless sintering and hot pressing methods were used to sinter the samples. The SEM micrographs were delivered by the Hitachi S-4700 microscope. It was a base to analyze the microstructures. The VISILOG 4 system was applied to calculate average grain sizes and homogeneity of grain size distributions. The results of measurements of dielectric parameters (dielectric permittivity, loss tangent) and piezoelectric parameters (electromechanical coupling coefficient, piezoelectric modulus) are presented. The resonance-antiresonance method was used to calculate piezoelectric properties. The influence of density, porosity, grains size and homogeneity of grain size distribution on dielectric and piezoelectric parameters is shown.
5
Domain wall motion effect in piezoelectric ceramics
Bartkowska J., Bluszcz J., Zachariasz R., Ilczuk J., Bruś B.
Molecular and Quantum Acoustics
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2008
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Vol. 29
7-10
EN
The internal friction (Q-1) in multiple-components ceramics PZT type was measured as a function of temperature from 300 to 600 K. An internal friction peak (P2) appears a few dozen degrees below Curie temperature (TC). The P2 peak of internal friction is found to be associated with the viscous-elastic mobility of domain walls. The internal friction due to the viscous-elastic mobility of domain walls was calculated and compared with the experimental data.
6
Mechanical loss in lead zirconate titanate ceramics
Zachariasz R., Czerwiec M., Ilczuk J., Bruś B., Zarycka A., Bartkowska J.
Molecular and Quantum Acoustics
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2007
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Vol. 28
305-308
EN
The mechanical loss (Q-1) and Young’s modulus (E) were measured as a function of temperature in the range 293K less than T less than 750K on rectangular bar samples of ferroelectric PbZr1-xTixO3 ceramics. There are two mechanical loss peaks, which are located below the phase transition point in coarse grained samples and they seem to be associated with the motion of domain walls. One of these peaks are not observed in fine grained undoped ceramics. The use of dopants such as Ge, Bi, Nb produces an attenuation of mechanical loss, a smoothing of elastic modulus anomalies, and a shifting of the phase transition temperatures.
7
Content available remote The internal friction background in PZT ceramics obtained by the sol-gel method
Zarycka A., Bruś B., Ilczuk J., Czerwiec M., Dukat M.
Materials Science Poland
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2007
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Vol. 25, No. 3
869--874
EN
The results of internal friction background examined in fine-grained lead zirconate titanate PZT ceramics are presented. The aim of the study was to describe the influence of change in concentration of the lead titanate on the internal friction background. The internal friction examinations were performed using modern automatic frequency relaxator of the RAK-3 type at 293 K. PZT ceramics of the chemical composition PbZrO3-PbTiO3 with PbTiO3 concentration ranging from 25% to 75% were the examined material. The nanopowders were prepared by the sol-gel method. PZT ceramics were obtained by the conventional sintering method. The influence of the changes in the structure of ceramic materials on the internal friction background was reported. SEM images of the domain structure were used to describe the obtained results.
8
Content available remote Phenomena responsible for energy dissipation in fine-grained PZT-type ceramics
Zarycka A., Bruś B., Rymarczyk J., Ilczuk J.
Materials Science Poland
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2007
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Vol. 25, No. 3
801--808
EN
Description of the mechanisms responsible for the dissipation of energy in materials is possible thanks to the internal friction (IF) method - a non-destructive method thought to be one of the most sensitive ones [1-3]. The method is based on measurements of mechanical losses at various temperatures or various frequencies. The study of the IF of ferroelectrics can provide extensive information about the physics of processes within these materials, and about their domain structures and their interactions with various structural defects. The aim of the present study was to describe the mechanisms responsible for energy dissipation in PZT ceramics obtained by the sol-gel method and sintered by conventional ceramics sintering (CCS). This work presents results of investigations of the influence of PbTiO3 concentration in PZT ceramics on these processes.
9
Relationship Between Obtaining Methodsand Piezoelectric Properties of the PZT Type Ceramic
Bruś B., Zarycka A., Czerwiec M., Ilczuk J.
Molecular and Quantum Acoustics
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2006
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Vol. 27
63-70
10
Mechanical Loss Associated with the Grain Sizein Lead Zirconate Titanate Ceramics
Zachariasz R., Czerwiec M., Ilczuk J., Bruś B., Zarycka A., Bartkowska J.
Molecular and Quantum Acoustics
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2006
|
Vol. 27
315-318
EN
The mechanical loss (Q-1) and Young's modulus (E) were measured as a function of temperature in the range 293K
11
Investigation of Relaxation Processes in a Ceramics of the PZT Type by the Internal Friction Method
Bruś B., Zachariasz R., Ilczuk J.
Molecular and Quantum Acoustics
|
2005
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Vol. 26
55-60
12
The Optimalization of the Properties of the Multicomponent Pzt Type Ceramics by the Choice of Appropriate Technological Conditions
Bruś B., Czerwiec M., Zachariasz R., Ilczuk J.
Molecular and Quantum Acoustics
|
2004
|
Vol. 25
213-218
EN
By the conventional ceramic sintering method, doped lead zirconate titanate (PZT) samples with the chemical composition 0.55PbTiO3-0.43PbZrO3-0.02[Pb(Cd0,5W0,5)O3] have been obtained from oxides PbO, ZrO2, TiO2, CdO, WO3. For the samples of A series, synthesis was led in the 1223 K temperature by 3 hours and in the case of the samples of B series, by 6 hours in the same temperature but in two parts (each 3 hours long). Both series were sintered in the 1423 K temperature by 6 hours. All samples were subjected to polarization (Tpol.=423 K, Epol.=30 kV/cm, tpol.=30 min.) and next dielectric (εT33/ε0, tgδ) properties were measured for the samples in the shape of discs. For the samples of B series, larger values of the dielectric permittivity εT33/ε0 were observed, as well as lower values of the dielectric oss tgδ.
13
The Internal Friction in the Phase Transition Area in the Pzt Type Ceramics
Zachariasz R., Bruś B., Bluszcz J., Ilczuk J.
Molecular and Quantum Acoustics
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2003
|
Vol. 24
249-254
EN
The aim of the present study was to measure phase tranistion temperatures and observe changes in the internal friction Q-1 and dynamic Young's modulus E in the area of these temperatures for the doped PZT ceramics, with the chemical composition: Pb0,975Ba0,01Ca0,01Sr0,005(Zr0,52Ti0,48)O3 + 1,4 wt% Bi2O3 + 0,3 wt% GeO. For all types of samples, on the temperature dependencies Q-1(T) two maxima of internal friction were observed: the relaxation peak PR and the PF peak originates from the ferroelectric-paraelectric phase transformation (Curie point).
14
Real Structure of Pzt Type Ceramics Obtained by the Sol - Gel Method
Zarycka A., Zachariasz R., Bruś B., Ilczuk J.
Molecular and Quantum Acoustics
|
2003
|
Vol. 24
255-260
EN
In the present work, the results of investigations of the real structure of PZT 65/35 piezoceramics obtained by sol - gel method are discussed. To characterize PZT ceramics the method of internal friction was used. The relationships between the chemical composition, crystalline structure and mechanical properties of piezoelectric ceramics were studies for the all samples.
15
Application of the Non Destructive Methods in the Investigation of The Ferroelectric Ceramics
Bruś B., Czerwiec M., Zachariasz R., Ilczuk J.
Molecular and Quantum Acoustics
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2003
|
Vol. 24
23-29
EN
This work shows the results of researches of the mechanical properties of the piezoelectric ceramics obtained by the hot pressing method. The measurements of the velocity of propagations longitudinal and transversal supersonic waves were carried out by ultrasonic defectoscope UMT-11. All measurement of the piezoelectric parameters such as: resonance and antiresonance frequency, the piezoelectric modulus, the electromechanical coupling coefficient, the tensor component of permittivity, elastic susceptibility were calculated by resonance-antiresonance method.
16
Influence of Frequency on the Internal Friction of Pzt Type Piezoceramics
Bruś B., Ilczuk J., Zarycka A.
Molecular and Quantum Acoustics
|
2002
|
Vol. 23
91-96
17
An Influence of the PbTiO3 Content on the Piezoelectric Proporties of a Multicomponent Piezoceramic of the PZT Type
Bruś B., Ilczuk J.
Molecular and Quantum Acoustics
|
2002
|
Vol. 23
83-90
18
In Influence of the PbTiO3 Content on the Piezoelectric Propertie of a Multicomponent Piezoceramic of the Pzt Type
Bruś B., Ilczuk J.
Molecular and Quantum Acoustics
|
2001
|
Vol. 22
37-44
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