PL
 |
EN
Ograniczanie wyników
Czasopisma help
  1. 34 Geodeta : magazyn geoinformacyjny
  2. 31 Archives of Metallurgy and Materials
  3. 10 Ceramic Materials
  4. 10 Materiały Ceramiczne
  5. 5 Materials Science Poland
Więcej...
Autorzy help
  1. 92 Czekaj D.
  2. 32 Lisińska-Czekaj A.
  3. 15 Osińska K.
  4. 11 Dzik J.
  5. 9 Bernard H.
Więcej...
Lata help
  1. 6 2020
  2. 9 2018
  3. 9 2017
  4. 12 2016
  5. 8 2015
Więcej...
Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 92

Liczba wyników na stronie
first rewind previous Strona / 5 next fast forward last
Wyniki wyszukiwania
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 5 next fast forward last
1
Content available X-Ray Diffraction Study of Bismuth Layer-Structured Multiferroic Ceramics
Lisińska-Czekaj A., Czekaj D., Garbarz-Glos B., Bąk W., Kuźniarska-Biernacka I.
Archives of Metallurgy and Materials
|
2020
|
Vol. 65, iss. 2
811--815
EN
Goal of the present research was to apply a solid state reaction route to fabricate bismuth layer-structured multiferroic ceramics described with the formula Bi5FeTi3O15 and reveal the influence of processing conditions on its crystal structure and phase composition. Simple oxide powders Bi2O3, TiO2 and Fe2O3 were used to fabricate Aurivillius-type bismuth layer-structured ferroelectrics. Pressureless sintering in ambient air was employed and the sintering temperature was TS = 900°C, TS = 1000°C and TS = 1040°C. The phase composition as well as crystal structure of ceramics sintered at various processing conditions was examined with powder X-ray diffraction method at room temperature. The Rietveld refinement method was applied for analysis of X-ray diffraction data. It was found that ceramics adopted orthorhombic structure Cmc21. The unit cell parameters of bismuth layer-structured multiferroic ceramics increased slightly with an increase in sintering temperature.
2
Content available The Application of the Mechanochemical Synthesis for the Preparation of Advanced Ceramics Based on Barium Titanate
Garbarz-Glos B., Bąk W., Budziak A., Dulian P., Lisińska-Czekaj A., Czekaj D.
Archives of Metallurgy and Materials
|
2020
|
Vol. 65, iss. 4
1391--1396
EN
In the present study, the lead-free BaTi1-x Zrx O3 (for x = 0, 0.05 and 0.15) ceramics were prepared by High-Energy Ball Milling and heat treatments. The performed X-ray, SEM and EDS measurements confirmed high purity, good quality and the expected quantitative composition of the obtained samples. The study of dielectric properties was performed by means of broadband dielectric spectroscopy at the frequency ranging from 0.1 Hz to 10 MHz. The obtained measurement data, analyzed in accordance with the Arrhenius formalism demonstrated the presence of relaxation type dielectric mechanisms. The impedance answer of studied ceramic materials indicated the presence of two relaxation processes: one with a dominant resistive component and the other with a small capacitive component. The observed dielectric relaxation process is temperature dependent and has a “non-Debye” character.
3
Content available Study of CuO and V2O5 Effect on IR Spectra of Polycrystalline Bismuth Niobate
Kuźniarska-Biernacka I., Lisińska-Czekaj A., Czekaj D.
Archives of Metallurgy and Materials
|
2020
|
Vol. 65, iss. 2
817--821
EN
Bismuth niobate (BiNbO4) ceramics were fabricated by mixed oxide method and sintered by presureless sintering method. BiNbO4 ceramics doped with V2 O5 additive in amount 0.125 wt%, 0.250 wt% and 1 wt% of was sintered at T = 910°C whereas BiNbO4 ceramics doped with 2 wt% of CuO additive was sintered at T = 890°C and T = 910°C. It was found that V2 O5 additive improved morphology of the ceramic samples. However, the chemical composition of BiNbO4 ceramics in relation to bismuth oxide and niobium oxide manifested a tendency of lack of Bi2 O3 component. Absorption bands for the BiNbO4 compound were identified. FTIR band positions associated with NbO6 octahedra suggested that the crystal structure changes after V2 O5 incorporation.
4
Content available Modelling of Dielectric Properties of BiNbO4-Based Microwave Ceramics
Czekaj D., Lisińska-Czekaj A., Garbarz-Glos B., Bąk W.
Archives of Metallurgy and Materials
|
2020
|
Vol. 65, iss. 3
1177--1181
EN
In the present paper results of the studies devoted to computer simulations of dielectric response of electroceramics in a frequency domain as well as analysis of the experimental data are given. As an object of investigations BiNbO4-based microwave ceramics was taken. Simulations of the hypothetical impedance response of the ceramic system were performed under assumption of the brick-layer model. A strategy for analysis and modelling of the impedance data for microwave electroceramics was discussed. On the base of the discussed strategy modelling of the dielectric response of BiNbO4 ceramics was performed with the electric equivalent circuit method. The Voigt’s and Maxwell’s circuits were taken as electric models. Parameters of the electric components of the circuits were determined and related to parameters of the ceramic object under study. It was found that fitting quality was good and changed within the range χ2 = 6.78 × 10-4 – 6.77 × 10-5 depending on the model.
5
Content available Influence of Ceramic Coating on Mechanical Properties of Stainless Steel
Czekaj D., Lisińska-Czekaj A., Krzysztofowicz K.
Archives of Metallurgy and Materials
|
2020
|
Vol. 65, iss. 2
911--916
EN
Crystal structure and phase composition of stainless steel substrates (AISI 304 type) was studied and it was found that they adopted the cubic symmetry. The calculated elementary cell parameter for the mayor Fe-Ni phase (weight fraction 99%) was a = 3.593 Å, whereas the mean grain size was = 2932 Å. Morphology of the stainless steel substrate surface was studied with profilometry. Mechanical properties of the stainless steel substrates and stainless steel substrates coated with ceramic layer of barium strontium titanate were studied with microhardness tester. For measurements performed according to the Vickers method the average microhardness was found HV = 189 or HV = 186 for the “in-line” and “mapping” measurement pattern, respectively. The sol-gel method was used to coat the surface of the stainless steel substrate with a thin ceramic layer of the chemical composition Ba0.6 Sr0.4 TiO3 . It was found that the stainless steel substrate covered with sol-gel deposited ceramic coating exhibited the average hardness within the range HV = 217 up to HV = 235 for loading force F = 98 mN and F = 0.98 N, respectively. The Knopp method was also used and it was found that the stainless steel substrate with Ba0.6 Sr0.4 TiO3 coating exhibited hardness HK = 386.
6
Content available Alternative, Direct Synthesis Method of the Ceramic Solid Solutions Based on BaTiO3 Through a High Energy Ball Milling
Bąk W., Dulian P., Garbarz-Glos B., Czekaj D., Lisińska-Czekaj A.
Archives of Metallurgy and Materials
|
2020
|
Vol. 65, iss. 2
805--810
EN
Polycrystalline samples BaTiO3 and the solid solutions Ba0.9 Sr0.1 TiO3, 0.9 Sr0.1 Ti0.9 Sn0.1 O3, Ba0.9 Sr0.1 Ti0.8 Sn0.2 O3 were obtained by means of a mechanochemical treatment based on the high-energy ball milling technique and next a high temperature solid state reaction method. The influence of synthesis condition on microstructural, dielectric and ferroelectric properties of obtained solid solutions were investigated. The structure and morphology of the investigated samples were characterized by an X-ray diffraction (XRD) and scanning electron microscopy (SEM). The characterization of electrical properties of the ceramics within the temperature range from –130°C to 250°C were performed by means of a dielectric spectroscopy method at the frequency ranging from 0.1 Hz to10 MHz. The diffusion of the paraelectric – ferroelectric phase transition and dielectric relaxation for ceramic samples are described.
7
Content available remote Wycinanie dyscyplin na hura
Czekaj D.
Geodeta : magazyn geoinformacyjny
|
2018
|
nr 10
30--31
8
Content available remote Wały pod kontrolą SAFEDAM
Czekaj D.
Geodeta : magazyn geoinformacyjny
|
2018
|
nr 4
27
9
Content available remote Tradycyjna konstrukcja w nowej technologii
Czekaj D.
Geodeta : magazyn geoinformacyjny
|
2018
|
nr 8
8--12
10
Content available remote Starostwo Spółka z o.o.
Czekaj D.
Geodeta : magazyn geoinformacyjny
|
2018
|
nr 2
8--14
11
Content available remote Łącznicą krócej
Czekaj D.
Geodeta : magazyn geoinformacyjny
|
2018
|
nr 1
28--31
12
Content available remote Kolejowy Kraków
Czekaj D.
Geodeta : magazyn geoinformacyjny
|
2018
|
nr 4
28--31
13
Content available remote Czekając na rynek pracownika
Czekaj D.
Geodeta : magazyn geoinformacyjny
|
2018
|
nr 9
12--16
14
Content available remote Centrum komiksu w chmurze
Czekaj D.
Geodeta : magazyn geoinformacyjny
|
2018
|
nr 2
42--44
15
Content available remote Influence of dopants on structure of polycrystalline bismuth niobate
Czekaj D., Lisińska-Czekaj A.
Advances in Materials Science
|
2018
|
Vol. 18, nr 4(58)
35--41
EN
Bismuth niobate (BiNbO4) has attracted attention as a low-fired ceramics with promising microwave application potential. BiNbO4 ceramics was fabricated by mixed oxide method and sintered at temperature T<1000°C. As the sintering aids a small amount of CuO oxide was used. The crystalline structure of the ceramic samples was examined by X-ray diffraction method at room temperature. The Rietveld refinement method was used for analysis of diffraction data. As a result an influence of dopants on crystal structure of bismuth niobate (BiNbO4) ceramics was revealed. It was found that fabricated BiNbO4 ceramics adopted the orthorhombic symmetry (α-BiNbO4 phase, Pnna (52) space group). Small differences in elementary cell parameters were found.
16
Content available remote Skanery w wyrobiskach
Czekaj D.
Geodeta : magazyn geoinformacyjny
|
2017
|
nr 10
38--42
17
Content available remote Pomiary na progu
Czekaj D.
Geodeta : magazyn geoinformacyjny
|
2017
|
nr 1
10--15
18
Content available remote Pomiarowy zawrót głowy
Czekaj D.
Geodeta : magazyn geoinformacyjny
|
2017
|
nr 6
8--14
19
Content available remote Pentax G6Ti
Czekaj D.
Geodeta : magazyn geoinformacyjny
|
2017
|
nr 12
36--38
20
Content available remote Most na stulecie niepodległości
Czekaj D.
Geodeta : magazyn geoinformacyjny
|
2017
|
nr 12
14--17
first rewind previous Strona / 5 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.