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Materials Science Poland
2012 Vol. 30, No. 3 240--247
EN We investigated electrical properties of nanostructured La1?x Sr x FeO3 (0 <= x <= 1) from 300 K-400 K. The nanostructured La1-x Sr x FeO3 (0 <= x <= 1) was synthesized by citrate gel method requiring no pH control. X-ray diffraction pattern showed that single phase LaFeO3 with an orthorhombic struc[...]
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Materials Science Poland
2010 Vol. 28, No. 4 764--772
EN Modulus and impedance spectroscopy studies on barium strontium samarium vanadate (Ba4SrSmTi3V7O30) were carried out, as functions of frequency (1 kHz-1 MHz) and temperature (31-500 °C). XRD analysis of Ba4SrSmTi3V7O30 ceramic revealed the formation of single phase compound in an orthorhombic structu[...]
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Materials Science Poland
2009 Vol. 27, No. 2 581--594
EN Composites were made from isotactic polypropylene and lignocellulosic materials derived from hemp and flax plants using moulding and hydraulic pressing techniques. Frequency dependences of the electric permittivity E and the ac conductivity .delta ac of the composite samples were measured in the fre[...]
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Journal of Achievements in Materials and Manufacturing Engineering
EN Purpose: In the paper physical (surface topography, electrical properties) and antithrombogenic properties of the passive-carbon layer used for enhancing the surface properties of vascular stents made of Cr-Ni-Mo steel have been investigated. Design/methodology/approach: To characterize the electric[...]
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Optica Applicata
EN In the present paper, we discuss the influence of point defects on electrical and optical characteristics of ZnO thin films grown by the atomic layer deposition (ALD) method. The films were grown on glass substrates at low temperature (100-200 °C). We used diethylzinc (DEZn) and deionized water as p[...]
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Optica Applicata
EN In this work, investigations of electrical properties of Eu- and Pd-doped TiO2 thin films have been outlined. Thin films were deposited by low pressure hot target reactive magnetron sputtering from metallic Ti-Eu-Pd mosaic target on conventional silicon wafers. For electrical characterization of pre[...]
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Bulletin of the Polish Academy of Sciences. Technical Sciences
EN Effects from adsorption of organic species on the surface of nanomaterials have been investigated. Exposure to organic contaminants during material processing, handling and environmental exposure is unavoidable during the manufacturing process of nanoscale materials. In addition, at the nanoscale, s[...]
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Polish Journal of Chemistry
EN Effect of polar impurities on transport of charge carriers in non-polar molecular materials is reviewed. The presence of such species gives rise to structural traps. Calculations of local values of the polarization energy in the vicinity of dipolar defect show that traps as deep as several tenths [...]
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Prace Naukowe Instytutu Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wrocławskiej. Konferencje
EN The growth in synthetic material use results in bringing problems connected with production of wastes, both the technology process wastes and after-use wastes. At present, the main problem is how to manage the material wastes and products as well as their possible recycling and secondary application[...]
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Physicochemical Problems of Mineral Processing
2004 Vol. 38 311-320
PL Spinele ferytowe ciągle wzbudzają duże zainteresowanie oraz wymagają dalszych intensywnych badań z uwagi na ich znaczenie technologiczne. Znajdują one liczne zastosowanie w przemyśle do produkcji urządzeń mikrofalowych, taśm magnetycznych do szybkiego zapisu, dysków do kmputerów oraz magnetycznych u[...]
EN Spinel ferrites have attracted considerable attention and efforts continue to investigate them for their technological importance to the microwave industries, high speed digital tape or disk recording and magnetic refrigeration system. NiFe2O4 was prepared by mixing pure nickel oxide and iron oxide,[...]
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Elektronika : konstrukcje, technologie, zastosowania
PL Nanomateriały wykazują wiele interesujących właściwości fizykochemicznych, bowiem reprezentują stan materii w obszarze przejściowym pomiędzy objętościowym ciałem stałym, a pojedynczą molekułą. Redukcja rozmiarów cząstek skutkuje tu zwiększeniem objętości fazy międzyziarnowej. Efekt ten determinuje w[...]
EN Nanomaterials have many interesting physicochemical properties because they represent the state of matter in the transition region between a volume solid and a single molecule. The reduction of particle size results in the increase of intergranular phase volume. This effect is determined by many uni[...]
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Opto - Electronics Review
EN Electrical properties of HgCdTe films grown by metal-organic chemical vapour deposition (MOCVD) on GaAs substrates and doped with the As acceptor during the growth were studied. Discrete mobility spectrum analysis was used to extract the parameters of the as-grown films and films after ion milling a[...]
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Materials Science Poland
2015 Vol. 33, No. 2 335--339
EN Microwave characteristics of M-type hexagonal ferrite, Ba-0.Sr-5(0).5CoxZrxFe(12-2x) O-19 (x = 0.0 to 1.0 in steps of 0.2), have been investigated as a function of frequency and substitution at X-band. The microwave absorption has been investigated using absorber testing device method. The static I-[...]
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Materials Science Poland
EN We report here the structural and electrical properties of Zn0:95M0:05O ceramic varistors, M = Zn, Ni and Fe. The samples were tested for phase purity and structural morphology by using X-Ray diffraction XRD and scanning electron microscope SEM techniques. The current-voltage characteristics J-E wer[...]
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Materials Science Poland
2016 Vol. 34, No. 1 164--168
EN Ca2Nd4Ti6O20, a layered perovskite structured material was synthesized via a chemical (citrate sol-gel) route for the first time using nitrates and alkoxide precursors. Phase analysis of a sample sintered at 1625 degrees C revealed the formation of an orth[...]
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Materials Science Poland
2015 Vol. 33, No. 3 593--600
EN In this work, we prepared an ideal Cu/DNA/n-InP biopolymer-inorganic Schottky sandwich device formed by coating a n-InP semiconductor wafer with a biopolymer DNA. The Cu/DNA/n-InP contact showed a good rectifying behavior. The ideality factor value of 1.08 and the barrier height (Φb) valu[...]
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Materials Science Poland
2005 Vol. 23, No. 1 247--252
EN A relation between crystallite size and electrical properties of ZrO2 has been investigated by measurements of high-pressure electrical resistance. The resistance of nanocrystalline praseodymium-doped zirconia powders has been measured in the pressure and temperature ranges between 15 and 50 GPa, an[...]
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LAB Laboratoria, Aparatura, Badania
2018 R. 23, nr 2 22--26
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Materials Science Poland
2009 Vol. 27, No. 1 109--122
EN The present paper reports the development of polystyrene-foliated graphite composites via a hot compression moulding technique. Foliated graphite, as obtained by the sonication of expanded graphite, was used as a filler. A distinct percolative behaviour was observed in the variation of conductivity [...]
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Journal of Achievements in Materials and Manufacturing Engineering
EN Purpose: The purpose of this study is the selection of phase composition of Si3N4 matrix ceramics with the addition of conducting phases so as to make shaping of those materials possible by means of electro discharge machining (EDM). Silicon nitride matrix materials with the ad[...]
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