Search results for: M. Wasiucionek

Items from 1 to 20 out of 52 results

article

Highly conductive cathode materials for Li-ion batteries prepared by thermal nanocrystallization of selected oxide glasses

T.K. Pietrzak, M. Wasiucionek, P.P. Michalski, A. Kaleta, more

Materials Science and Engineering: B > 2016 > 213 > C > 140-147

Glassy analogs of two important cathode materials for Li-ion cells: V₂O₅ and phosphoolivine LiFePO₄ were heat-treated in order to prepare nanocrystallized materials with high electronic conductivity of up to 7×10⁻²Scm⁻¹ and ca 7×10⁻³Scm⁻¹ at 25°C, respectively. There is a clear correlation between the crystallization phenomena and the increase in the electrical conductivity for both groups of glasses...

article

AC/DC conductivity studies of composites of glassy electronic and ionic conductors

W. Slubowska, J.L. Nowinski, T.K. Pietrzak, J.E. Garbarczyk, more

Solid State Ionics > 2016 > 288 > C > 277-280

A series of all-glass composites has been prepared from the ionically conducting silver–phosphate glass 30AgI·35Ag₂O·35P₂O₅ (denoted as I) and the electronically conducting vanadate–phosphate glass 90V₂O₅·10P₂O₅ (denoted as E). Component glasses were ground, mixed in five volume ratios (E:I=3:1, 2:1, 1:1, 1:2, 1:3) and pelletized under pressure. X-ray diffractometry and DSC analyses confirmed an amorphous...

article

Optimization of synthesis of single phase nanostructured LiFePO₄materials

M. Winkowska, L. Lipińska, T. Strachowski, M. Wasiucionek

Materiały Elektroniczne > 2016 > T. 44, nr 3 > 4--8

LiFePO₄samples were first prepared by a modified sol - gel process and then the resulting LiFePO₄xerogel was ground and calcined in a tube furnace in an inert atmosphere in nitrogen flow. The main goal of this research work which was lowering the temperature and the time of synthesis of LiFePO₄was achieved. It was confirmed that the material contains only a LiFePO₄triphylite phase and that the presence...

article

Extension of α-AgI stabilization range in AgI–Ag2O–MxOy systems by mechanosynthesis processing

P. Grabowski, J.L. Nowinski, M. Holdynski, J.E. Garbarczyk, more

Journal of Non-Crystalline Solids > 2015 > 408 > C > 66-70

The ultra-fast quenching method and mechanosynthesis processing were employed to prepare the AgI–Ag₂O–M_xO_y glasses (where M_xO_y=B₂O₃, WO₃, MoO₃, V₂O₅) containing AgI crystalline inclusions. After heating in elevated temperatures the α-AgI superionic phase was formed: regarding the composition and preparation method its stabilization to lower temperatures was investigated. X-ray diffraction, differential...

article

Mechanosynthesized and ultra-fast quenched AgI–Ag2O–B2O3 materials with high AgI contents

P. Grabowski, J.L. Nowiński, J.E. Garbarczyk, M. Wasiucionek

Solid State Ionics > 2013 > 251 > Complete > 55-58

The 78AgI, 16.5Ag ₂ O, and 5.5B ₂ O ₃ mol% powder mixture, ultra-fast quenched 78AgI-16.5Ag ₂ O-5.5B ₂ O ₃ glass containing α-AgI crystalline precipitates and pristine AgI were ball-milled at a high rotation speed. For all the materials, the processing did not cause formation of α-AgI phase, in contrary, it prompted α to β phase transition of the α-AgI...

article

Electrical properties of V2O5 nanomaterials prepared by twin rollers technique

T.K. Pietrzak, M. Maciaszek, J.L. Nowiński, W. Ślubowska, more

Solid State Ionics > 2012 > 225 > Complete > 658-662

Vanadium pentoxide glassy-crystalline nanostructured materials were prepared by solidification of the molten V ₂ O ₅ , using the twin rollers technique. The studied materials were characterized by: X-ray diffractometry (XRD), scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and impedance spectroscopy (IS). It was found that the morphology, the relative content...

article

Electrical conductivity and phase transformations in the composite ionic conductors AgI : α-Al2O3 prepared via a high-pressure route

M. Wasiucionek, K. Galazka, J.E. Garbarczyk, J.L. Nowinski, more

Solid State Ionics > 2011 > 192 > 1 > 113-117

Silver ion conducting composites of the general formula xAgI : (1−x)α-Al ₂ O ₃ , where 0.2≤x≤0.8 (vol fraction) were prepared using a high-pressure synthesis route (T=400°C, p=7.5GPa). The microstructure of as-received rigid, non-brittle and dense samples was investigated by SEM. Other studies — DSC, XRD and impedance spectroscopy, were done as a function of temperature in the 20–200°C...

article

Electrical properties vs. microstructure of nanocrystallized V2O5–P2O5 glasses — An extended temperature range study

T.K. Pietrzak, J.E. Garbarczyk, M. Wasiucionek, I. Gorzkowska, more

Solid State Ionics > 2011 > 192 > 1 > 210-214

An electronically conducting nanomaterial was synthesized by nanocrystallization of a 90V ₂ O ₅ ·10P ₂ O ₅ glass and its electrical properties were studied in an extended temperature range from −170 to +400°C. The conductivity of the prepared nanomaterial reaches 2∙10 ⁻¹ Scm ⁻¹ at 400°C and 2∙10 ⁻³ Scm ⁻¹ at room temperature. It is higher...

article

Electrical properties of the all-glass composite silver ion conductors

J.L. Nowiński, W. Ślubowska, J.E. Garbarczyk, M. Wasiucionek

Solid State Ionics > 2011 > 188 > 1 > 90-93

The work studies electrical conductivity of binary all-glass composites composed of superionic phosphate, vanadate, molybdate and tungstate glasses by means of the impedance spectroscopy in the temperature range from −140°C to +20°C. Electrical properties of the composites can be modelled using a simple equivalent circuit typically applicable for homogeneous systems. Effective conductivity fulfils...

article

Nanocrystalline lithium–manganese oxide spinels for Li-ion batteries — Sol-gel synthesis and characterization of their structure and selected physical properties

M. Michalska, L. Lipińska, M. Mirkowska, M. Aksienionek, more

Solid State Ionics > 2011 > 188 > 1 > 160-164

Nanocrystalline lithium–manganese oxide spinels were synthesized by a modified sol-gel method. Simple salts of lithium, manganese and iron were used as starting reagents and citric acid as a complexing agent. The gelled materials turned into nanopowders after the calcination was carried out in air in the 450–700°C temperature range. The combined DSC-TGA measurements have shown important stages of...

article

Characterisation of silver vanadate glasses prepared by melt quenching, twin rollers and mechanosynthesis methods

A. Czajkowska, J. Nowiński, M. Mroczkowska, J.E. Garbarczyk, more

Solid State Ionics > 2011 > 188 > 1 > 94-98

Three different methods - melt quenching, twin rollers and mechanosynthesis - were used for preparation of the 50AgI·30Ag ₂ O·20V ₂ O ₅ glass – a good amorphous superionic conductor. It was demonstrated that physical properties of the final amorphous material depend to some extent on the preparation method. As-received samples were characterized by: X-ray diffractometry (XRD),...

article

Electrical properties and thermal stability of FePO4 glasses and nanomaterials

T.K. Pietrzak, L. Wewior, J.E. Garbarczyk, M. Wasiucionek, more

Solid State Ionics > 2011 > 188 > 1 > 99-103

Glasses under study were prepared by a standard press quenching technique. Differential thermal analysis (DTA) measurements have shown that the as-obtained glasses are stable up to 530°C. The DTA traces contain three thermal events: a baseline shift due to the glass transition followed by two distinct exothermic peaks related to crystallization processes. The positions of maxima of those peaks obey...

article

Influence of the process variables on mechanosynthesis of AgI–Ag2O–WO3 system

J.L. Nowiński, P. Grabowski, J.E. Garbarczyk, M. Wasiucionek

Solid State Ionics > 2011 > 188 > 1 > 86-89

The work studies the effect of selected milling variables on mechanosynthesis of the materials formed in the AgI–Ag ₂ O–WO ₃ system. These variables were: a rotation speed, a milling time, a ball-to-powder mass ratio, a process control agent and a level of preliminary grinding of the reactant powders. The mechanosynthesis was carried out using Fritsch Pulverisette 7 and Fritsch Pulverisette...

article

Correlation between electrical properties and microstructure of nanocrystallized V2O5–P2O5 glasses

T.K. Pietrzak, J.E. Garbarczyk, I. Gorzkowska, M. Wasiucionek, more

Journal of Power Sources > 2009 > 194 > 1 > 73-80

It was shown that by thermal nanocrystallization of a 90V ₂ O ₅ ·10P ₂ O ₅ glass one can obtain a novel nanomaterial exhibiting enhanced electronic conductivity. Using a combination of methods: DTA, SEM, XRD and impedance spectroscopy (IS), it was possible to find correlation between microstructure and electrical properties of the obtained material and to optimize conditions...

article

Novel nanomaterials based on electronic and mixed conductive glasses

J.E. Garbarczyk, M. Wasiucionek, P. Jozwiak, J.L. Nowinski, more

Solid State Ionics > 2009 > 180 > 6-8 > 531-536

Novel nanomaterials based on lithium–vanadate-phosphate (LVP) and lithium–iron-phosphate (LFP) glasses were prepared and their electrical properties were investigated by impedance spectroscopy. It was found out that the electronic conductivity of the original glasses of both systems can be considerably enhanced by appropriate annealing at temperatures close to beginning of crystallization temperatures...

article

The thermal stability, local structure and electrical properties of lithium-iron phosphate glasses

P. Jóźwiak, J. E. Garbarczyk, M. Wasiucionek, I. Gorzkowska, more

Materials Science Poland > 2009 > Vol. 27, No. 1 > 307--318

Amorphous analogues of lithium-iron phosphates (LFP), which are promising cathode materials for Li ion batteries, were prepared by the standard press-quenching method and their thermal stability, as well as structural and electrical properties, were studied for the first time. The glass transition temperature, Tg, determined by the differential thermal analysis (DTA) is composition-dependent and lies...

article

Electrical properties and microstructure of glassy-crystalline Ag+-ion conducting composites synthesized by a high-pressure method

M. Wasiucionek, M. Foltyn, J.E. Garbarczyk, J.L. Nowinski, more

Solid State Ionics > 2008 > 179 > 27-32 > 1278-1281

Rigid, mechanically reinforced, composite Ag ⁺ -ion conductors based on xAgI·(100-x) (0.67Ag ₂ O·0.33B ₂ O ₃ ), 40≤x≤60, glasses and hard insulating powders of α-Al ₂ O ₃ (2 µm) or ZrO ₂ (1 µm) were prepared by a high-pressure method. Microstructure of the composites, depended on the content of AgI in the glasses and the temperature of the high-pressure...

article

Effect of oxygen-containing synthetic atmospheres on the impedance spectra of PtAu and PtRh electrodes applied on YSZ substrates

P. Kurek, M. Marzantowicz, M. Foltyn, M. Wasiucionek

Solid State Ionics > 2008 > 179 > 1-6 > 178-181

Impedance spectroscopy measurements were carried out on a series of PtAu and PtRh electrodes applied onto YSZ ceramic substrates. Impedance spectra were collected in the 10mHz–100 kHz frequency range using a three-electrode arrangement with either PtAu1 % or PtRh 20% as the working electrode, and Pt metal as reference and counter electrodes. Measurements were done at temperatures 550 and 750 °C in...

article

Electrical properties of silver vanadate amorphous superionic conductors prepared via a mechanosynthesis route

J.L. Nowiński, A. Łasińska, A. Czajkowska, J.E. Garbarczyk, more

Solid State Ionics > 2008 > 179 > 1-6 > 206-212

The mechanosynthesis method were used for preparation of the xAgI·0.25(100−x)(3Ag ₂ O·V ₂ O ₅ ), 40≤x≤85 superionic materials. There was first time demonstrated, that by means of this method pure amorphous materials could be formed for 50≤x≤70 compositions. According to literature reports such materials are unobtainable by press or fast quench methods. Other synthesized materials...

article

DSC and XRD studies on crystallization kinetics in AgI-rich glassy and glass-crystalline ionic conductors of the AgI–Ag2O–P2O5 system

M. Mroczkowska, T. Czeppe, J.L. Nowinski, J.E. Garbarczyk, more

Solid State Ionics > 2008 > 179 > 1-6 > 202-205

The glassy and glassy-crystalline materials of nominal composition xAgI·(100-x) (0.75Ag ₂ O·0.25P ₂ O ₅ ), for 50≤x≤85, were investigated by DSC and XRD methods.For a composition corresponding to x=50 an additional series of DSC scans at different heating rates from 6 to 20 K·min ⁻¹ was carried out. These measurements revealed the occurrence of three crystallization...

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Search results for: M. Wasiucionek

Highly conductive cathode materials for Li-ion batteries prepared by thermal nanocrystallization of selected oxide glasses

AC/DC conductivity studies of composites of glassy electronic and ionic conductors

Optimization of synthesis of single phase nanostructured LiFePO₄materials

Extension of α-AgI stabilization range in AgI–Ag2O–MxOy systems by mechanosynthesis processing

Mechanosynthesized and ultra-fast quenched AgI–Ag2O–B2O3 materials with high AgI contents

Electrical properties of V2O5 nanomaterials prepared by twin rollers technique

Electrical conductivity and phase transformations in the composite ionic conductors AgI : α-Al2O3 prepared via a high-pressure route

Electrical properties vs. microstructure of nanocrystallized V2O5–P2O5 glasses — An extended temperature range study

Electrical properties of the all-glass composite silver ion conductors

Nanocrystalline lithium–manganese oxide spinels for Li-ion batteries — Sol-gel synthesis and characterization of their structure and selected physical properties

Characterisation of silver vanadate glasses prepared by melt quenching, twin rollers and mechanosynthesis methods

Electrical properties and thermal stability of FePO4 glasses and nanomaterials

Influence of the process variables on mechanosynthesis of AgI–Ag2O–WO3 system

Correlation between electrical properties and microstructure of nanocrystallized V2O5–P2O5 glasses

Novel nanomaterials based on electronic and mixed conductive glasses

The thermal stability, local structure and electrical properties of lithium-iron phosphate glasses

Electrical properties and microstructure of glassy-crystalline Ag+-ion conducting composites synthesized by a high-pressure method

Effect of oxygen-containing synthetic atmospheres on the impedance spectra of PtAu and PtRh electrodes applied on YSZ substrates

Electrical properties of silver vanadate amorphous superionic conductors prepared via a mechanosynthesis route

DSC and XRD studies on crystallization kinetics in AgI-rich glassy and glass-crystalline ionic conductors of the AgI–Ag2O–P2O5 system

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