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1
Content available remote Wpływ nadmiaru Bi2O3 na syntezę i właściwości ceramiki BiNbO4
100%
Rerak M.
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2018
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tom T. 70, nr 1
36--42
PL
Ceramika BiNbO4 należy do rodziny materiałów o strukturze szelitu. Charakteryzuje się ona obiecującymi właściwościami ferroelektrycznymi, które z powodzeniem mogą znaleźć zastosowanie w technice wysokich częstotliwości czy mikroelektronice. W niniejszej pracy określono warunki syntezy oraz opisano wpływ nadmiarowego Bi2O3 i temperatury spiekania na właściwości ceramiki BiNbO4. Badany materiał wytworzono metodą reakcji w fazie stałej, wykorzystując mieszaninę tlenków o wysokiej czystości (99.99%). Nadmiar Bi2O3 nie wpłynął na minimalną wymaganą temperatury syntezy proszku niobianu bizmutu, jednak miał wpływ na skład fazowy spieków, ich gęstość i mikrostrukturę.
EN
BiNbO4 is a ceramic belonging to the family of materials with the scheelite structure. It shows promising ferroelectric properties that can be successfully used in high frequency techniques or microelectronics. In this work, the synthesis conditions were determined and the effect of excess Bi2O3 and sintering temperature on the properties of the BiNbO4 ceramic were described. The test material was prepared by solid phase reaction using a high purity oxide mixture (99.99%). Excess Bi2O3 did not affect the minimum required temperature of synthesis of bismuth nibate powder, however, it affected the phase composition of sinters, their density and microstructure.
2
Content available Influence of Dy Doping on the Properties of BiFeO3
45%
Dzik J. , Feliksik K. , Pikula T. , Panek R. , Rerak M.
Archives of Metallurgy and Materials
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2018
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tom Vol. 63, iss. 3
1351--1355
EN
The aim of this research was to fabricate and study the properties of Bi1-x DyxFeO3 (for x = 0, 0.05, 0.07, 0.1) ceramics materials. Simple oxide powders Bi2O3, Dy2O3 and Fe2O3 were used to fabricate Bi1-xDyxFeO3 ceramics by mixed oxide method followed by free sintering. The study presents changes in microstructure and crystal structure as well as in dielectric properties and magnetic properties caused by modification of BiFeO3 with dysprosium dopant.
3
Content available Low temperature broad band dielectric spectroscopy of multiferroic Bi6Fe2Ti3O18 ceramics
38%
Lisińska-Czekaj A. , Rerak M. , Czekaj D. , Lubina M. , Garbarz-Glos B. , Bąk W.
Archives of Metallurgy and Materials
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2016
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tom Vol. 61, iss. 3
1447--1452
EN
In the present research the tool of broadband dielectric spectroscopy was utilized to characterize dielectric behavior of Bi6Fe2Ti3O18is (BFTO) Aurivillius-type multiferroic ceramics. Dielectric response of BFTO ceramics was studied in the frequency domain (Δν=0.1Hz - 10MHz) within the temperature range ΔΤ=-100°C - 200°C. The Kramers-Kronig data validation test was employed to validate the impedance data measurements and it was found that the measured impedance data exhibited good quality justifying further analysis. The residuals were found to be less than 1%, whereas the "chi-square" parameter was within the range χ2~-10-7 -10-5. Experimental data were analyzed using the circle fit of simple impedance arc plotted in the complex Z”-Z` plane (Nyquist plot). The total ac conductivity of the grain boundaries was thus revealed and the activation energy of ac conductivity for the grain boundaries was calculated. It was found that activation energy of ac conductivity of grain boundaries changes from ΕA=0.20eV to ΕA=0.55eV while temperature rises from Τ=-100°C up to Τ=200°C. On the base of maxima of the impedance semicircles (ωmτm=l) the relaxation phenomena were characterized in terms of the temperature dependence of relaxation times and relevant activation energy was calculated (ΕA=0.55eV).
4
Content available Influence of Lanthanum Dopant on the Structure and Electric Properties of BaBi2Nb2O9 Ceramics
38%
Adamczyk-Habrajska M. , Goryczka T. , Szalbot D. , Dzik J. , Rerak M. , Bochenek D.
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2020
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tom Vol. 65, iss. 1
207--214
EN
The paper reports the consequences of lanthanum modifications of barium bismuth niobiate (BaBi2 Nb2 O9) ceramics. The discussed materials were prepared by solid state synthesis and a one-step sintering process. The investigations are focused on dielectric aspects of the modification. The presented results reveal that the trivalent lanthanum ions incorporate twovalent barium ions, which is connected with the creation of A-site cationic vacancies as well as oxygen vacancies. Such a scenario results in significant decreasing in grain boundaries resistivity. The activation energy of grain boundaries conductivity is significantly reduced in the case of lanthanum admixture.
5
Content available Influence of Processing Conditions on Crystal Structure of Bi6Fe2Ti3O18 Ceramics
38%
Lisińska-Czekaj A. , Lubina M. , Czekaj D. , Rerak M. , Garbarz-Glos B. , Bąk W.
Archives of Metallurgy and Materials
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2016
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tom Vol. 61, iss. 2A
881--886
EN
Aim of the present research was to apply a solid state reaction route to fabricate Aurivillius-type ceramics described with the formula Bi6Fe2Ti3O18 (BFTO) and reveal the influence of processing conditions on its crystal structure. Pressureless sintering in ambient air was employed and the sintering temperatures were 850 and 1080 °C. It was found that the fabricated BFTO ceramics were multiphase ones. They consisted of two Bim+1Fem-3Ti3O3m+3 phases, namely the phase with m=5 (i.e. the stoichiometric phase) and m=4 (i.e. the phase with a reduced number of layers in the slab). Detailed X-ray diffraction patterns analysis showed that both phases adopted the same orthorhombic structure described with Fmm2 (42) space group. The ratio of weight fractions of the constituent phases (m=5): (m=4) was ~30:70.
6
Content available Influence of Processing Conditions on Crystal Structure of Bi6Fe2Ti3O18 Ceramics
32%
Lisińska-Czekaj A. , Rerak M. , Lubina M. , Czekaj D. , Garbarz-Glos B. , Bąk W.
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nr 2
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