Materials Science Poland

article

Synthesis, structure and magnetic susceptibility of ammonium hexaiodorhenate(IV)

A. Kochel

Materials Science Poland > 2004 > Vol. 22, No. 1 > 69--75

This work reports on the synthesis, magnetic properties and crystal structure of (NH4)2ReI6. Bright violet (NH4)2ReI6 is tetragonal, P4/mnc (No. 128), a = b = 7.7436(6), c = 11.6403(14) A, Z = 2, Dx = 4.68 g/cm3, T = 100(1) K. The structure was refined to R = 0.074 for 438 reflections observed. The anion [ReI6]2- has an octahedral environment. The temperature dependence of the magnetic susceptibility...

article

Luminescence properties of nanophosphors: metal ion-doped sol-gel silica glasses

M. Morita, D. Rau, S. Kajiyama, T. Sakurai, more

Materials Science Poland > 2004 > Vol. 22, No. 1 > 5--15

Photoluminescence of xerogel and sol-gel SiO2 glasses doped with metal ions, metal complexes and semiconductor nanocrystals are investigated at 300 K and 10 K to clarify the optical properties and the electronic structures of nanophosphors. Sol-gel glasses doped with 3d, 4d and 5d transition metal ions exhibit a bright luminescence with various colours due to the 3LMCT transition associated with closed...

article

Effective nuclear charge of an ion

A. Stokłosa, J. Zajęcki, S. S. Kurek

Materials Science Poland > 2004 > Vol. 22, No. 1 > 35--45

An analysis of the effective nuclear charge of ions based on linear relationships of the reciprocal of an ionic radius or the square root of ionisation energy and the nuclear charge of the ion has been carried out. It has been demonstrated that the effective nuclear charge of an ion is significantly different from its formal charge. The obtained character of the relationship indicates that the postulated...

article

The kinetics of photoelectric processes near interfaces of C60/liquid crystals

O. P. Boiko, Y. I. Vertsimakha

Materials Science Poland > 2004 > Vol. 22, No. 1 > 47--56

The interface between vacuum deposited C60 fullerene films and layers of mimetic liquid crystals (LC), such as pentylcyanobiphenyl (5??) or the BL055 mixture has been studied. In order to understand the processes of barrier formation at the C60 /LC interface, the kinetics of the dark current, short-circuit photocurrent and photo voltage caused by short pulses of light (~60 sec, hv = 1.88 eV) were...

article

Pamoate intercalated Zn-Al layered double hydroxide for the formation of layered organic-inorganic intercalate

M. Z. Hussein, Z. B. Jubri, Z. Zainal, A. H. Yahya

Materials Science Poland > 2004 > Vol. 22, No. 1 > 57--67

A layered organic-inorganic intercalate was prepared by the self-assembly technique using pamoate (PA) as an organic guest in the Zn-Al layered double hydroxide inorganic host (ZAPAN). Various concentrations of PA, ranging from 0.01 to 0.04 M, were used to prepare the intercalated compound with a constant 4:1 ratio of Zn:Al in the mother liquor. The concentration of PA of 0.02 M at pH 7 was found...

article

Analysis of ionisation energies of ions, ionic radii in a crystal lattice and the energy of electrons in ionic cores of metal atoms

A. Stokłosa, J. Zajęcki, S. S. Kurek

Materials Science Poland > 2004 > Vol. 22, No. 1 > 17--33

An analysis of ionic radii, ionisation energies of ions and the electron binding energies in the highest occupied atomic orbitals of elements in their thermodynamically stable states is presented in the paper. It was shown that, for a number of ions of the same electronic configuration, several parameters, like the reciprocals of the ionic radii, square roots of ionisation energies and electron binding...

article

A shock-wave model of the effect of superdeep penetration of powder particles into metallic materials

A. E. Kheifets, V. I. Zel'dovich, N. Y. Frolova, I. V. Khomskaya

Materials Science Poland > 2004 > Vol. 22, No. 2 > 117--121

A shock-wave model of the effect of superdeep penetration of explosion accelerated powder particles into metallic materials has been created. A criterion for the phenomenon proceeding by explosive loading of a target by a flow of particles is obtained. It is established that a flow action results in an homogeneous radial stretching of the target material. The stretching occurs by mobile cavities which...

article

Propagation and interaction of dodecahedral converging shock waves in steel balls

A. E. Kheifets, V. I. Zel'dovich, I. V. Khomskaya, N. Y. Frolova, more

Materials Science Poland > 2004 > Vol. 22, No. 2 > 123--129

Physical metallurgical and computer simulation methods were used to study the propagation and interaction of shock waves in steel balls subjected to convergent dodecahedrally symmetric shock waves. Conditions for energy cumulation and the realization of regular and irregular types of shock wave interactions were studied. Based on microstructural investigations of intact samples, the parameters of...

article

The effect of film thickness on physical properties of fluorine-doped indium oxide thin films

S. M. Rozati, T. Ganj

Materials Science Poland > 2004 > Vol. 22, No. 2 > 93--97

In this paper, fluorine-doped indium oxide films of thicknesses ranging from 115 nm to 1290 nm were prepared using the spray pyrolysis technique by varying the amount of spray solution and keeping constant the substrate temperature, doping concentration and air flow rate. The preferential growth orientation was determined using the X-ray diffraction (XRD) spectra of doped indium oxide films of various...

article

Transport phenomena in ammonium halides under high pressures

G. V. Tikhomirova, A. N. Babushkin

Materials Science Poland > 2004 > Vol. 22, No. 2 > 131--135

Polycrystalline ammonium chloride (NH4Cl), fluoride (NH4F) and bromide (NH4Br) were studied at pressures from 20 to 50 GPa in the temperature range of 77-400 K. Phase transitions from a highresistance to low-resistance state was found. The transition pressures were about 15 GPa for NH4Br, 27 GPa for NH4Cl, and 42 GPa for NH4F. The transition temperatures and pressures were shown to depend on the preliminary...

article

Photoelectrochemical properties of sol-gel derived TiO2 thin films in aqueous sodium oxalate solution

Z. Zainal, C. Y. Lee, M. Z. Hussein, A. Kassim

Materials Science Poland > 2004 > Vol. 22, No. 2 > 99--110

Photoelectrooxidation of aqueous sodium oxalate on TiO2 thin films has been investigated. The films, prepared by sol-gel dip-coating, were characterised using Scanning Electron Microscopy and X-ray Diffractometry. Photosensitivity of samples was studied using Linear Sweep Voltammetry and Chronoamperometry techniques. The photoelectrochemical performance of thin film electrodes was evaluated in function...

article

Yttrium iron garnet surface modification during pulsed laser ablation deposition

N. B. Ibrahim, C. Edwards, S. B. Palmer

Materials Science Poland > 2004 > Vol. 22, No. 2 > 111--115

This paper reports on the formation of cone-like structures on yttrium iron garnet (YIG) targets during the ablation of YIG thin films. Energy dipersive X-ray analysis (EDS) performed in the targets show that the cones are rich in yttrium.

article

Properties and applications of silica submicron powders with surface Ag nanoclusters

M. Jasiorski, S. Bakardijeva, W. Doroszkiewicz, S. Brzeziński, more

Materials Science Poland > 2004 > Vol. 22, No. 2 > 137--144

Spherical silica powders with uniform, submicron grain diameter have been obtained using the sol -gel technology. Subsequently, metallic silver nanoparticles have been produced on the surfaces of the grains. Raman scattering spectra of such SiO2-Ag0 powders impregnated in ethanol solutions of tris(2,2' -bipyridyl)ruthenium(II) can be recorded for solutions four orders of magnitude more diluted than...

article

Synthesis and characterization of metastable CeO2-ZrO2 solid solution obtained by polymerized complex method

W. Miśta, T. Rayment, J. Hanuza, L. Macalik

Materials Science Poland > 2004 > Vol. 22, No. 2 > 153--170

The paper describes the preparation and characterization of nano-size metastable tetragonal CeO2–ZrO2 mixed oxides prepared by a polymerized complex method. A glycine–ethylene glycol solution containing Ce3+ and Zr4+ ions was polymerized at 80–110 °C to form a viscous transparent resin without any visible precipitation. After heat-treatment at relatively low temperature (ca 250 °C) on a hot plate...

article

Luminescence properties of Eu3+-doped Al2(WO4)3

L. Macalik, J. Hanuza, K. Hermanowicz, P. Godlewska, more

Materials Science Poland > 2004 > Vol. 22, No. 2 > 145--152

Emission spectra of Al2(WO4)3 doped with Eu3+ were recorded at room temperature (orthorhombic phase) and at 10 K (monoclinic phase). The luminescence excitation spectra and luminescence decay profiles were recorded for both structural modifications at RT and LN2T, and the luminescence lifetimes of Eu3+ have been estimated. Two-site behaviour of the optically active ions in both phases has been revealed...

article

Chemical durability of ß-wollastonite-reinforced glass-ceramics prepared from waste fluorescent glass and calcium carbonate

B. H. Kim, B. A. Kang, Y. H. Yun, K. S. Hwang

Materials Science Poland > 2004 > Vol. 22, No. 2 > 83--91

We prepared glass-ceramics reinforced by ß-wollastonite using waste fluorescent glass to resolve the environmental problem. Fluorescent glass and calcium carbonate were used as starting materials. The chemical durability of specimens heat-treated at 800 °C, 900 °C, and 1000 °C was analyzed by both measuring weight change and observing surface morphology. Specimen composition was determined with energy...

article

Synthesis and luminescence properties of nanocrystalline BaTiO3:Nd3+ obtained by sol-gel methods

R. Pązik, D. Hreniak, W. Stręk

Materials Science Poland > 2004 > Vol. 22, No. 3 > 210--225

Neodymium-doped barium titanate (BaTiO3) nanocrystalline powders were prepared by the sol-gel method. Structure and average grain sizes were analysed by X-ray powder diffraction (XRD) measurements. Grain sizes amount from 30 to 60 nm, depending on dopant concentration and sintering temperature. The luminescence properties of BaTiO3:Nd3+ were investigated as a function of the concentration of Nd3+...

article

Investigations of the surface morphology of Al2O3 layers by atomic force microscopy

W. Skoneczny, J. Jurusik, A. Burian

Materials Science Poland > 2004 > Vol. 22, No. 3 > 265--278

Amorphous alumina coating films, prepared on aluminium substrates by oxidation by the electrolytic method in ternary electrolytes, have been characterised by atomic force microscopy. The surface roughness and growth structure of the obtained Al2O3 films are related to the experimental conditions: temperature, current density, and deposition time. They are also related to the preparation method of...

article

Analysis of optical transitions of Nd3+ in YAG nanocrystallites

A. Bednarkiewicz

Materials Science Poland > 2004 > Vol. 22, No. 3 > 211--217

A novel approach to the analysis of optical transitions in Nd3+-doped nanocrystallites is put forward, based on the Judd-Ofelt analysis of luminescence transitions associated with the 4F3/2›4I11/2 and 4F3/2›4I9/2 bands. The procedure, requiring neither information on Nd3+ concentration nor transparent samples, greatly simplifies calculation of branching ratios of neodymium 4F3/2 ›4IJ. The technique...

article

Development of highly transparent and conducting yttrium-doped ZnO films: the role of sol-gel stabilizers

R. Kaur, A. V. Singh, R. M. Mehra

Materials Science Poland > 2004 > Vol. 22, No. 3 > 201--209

Yttrium-doped zinc oxide (YZO) thin films were deposited with the dip coating technique. The effect of different sol-gel stabilizers (lactic acid with hydrolysis, without hydrolysis, and diethanolamine (DEA)) on structural, electrical and optical properties of the produced films were investigated. The stability of solutions prepared with DEA was much higher than that of other stabilizers. Films deposited...

INFONA - science communication portal

Materials Science Poland

Synthesis, structure and magnetic susceptibility of ammonium hexaiodorhenate(IV)

Luminescence properties of nanophosphors: metal ion-doped sol-gel silica glasses

Effective nuclear charge of an ion

The kinetics of photoelectric processes near interfaces of C60/liquid crystals

Pamoate intercalated Zn-Al layered double hydroxide for the formation of layered organic-inorganic intercalate

Analysis of ionisation energies of ions, ionic radii in a crystal lattice and the energy of electrons in ionic cores of metal atoms

A shock-wave model of the effect of superdeep penetration of powder particles into metallic materials

Propagation and interaction of dodecahedral converging shock waves in steel balls

The effect of film thickness on physical properties of fluorine-doped indium oxide thin films

Transport phenomena in ammonium halides under high pressures

Photoelectrochemical properties of sol-gel derived TiO2 thin films in aqueous sodium oxalate solution

Yttrium iron garnet surface modification during pulsed laser ablation deposition

Properties and applications of silica submicron powders with surface Ag nanoclusters

Synthesis and characterization of metastable CeO2-ZrO2 solid solution obtained by polymerized complex method

Luminescence properties of Eu3+-doped Al2(WO4)3

Chemical durability of ß-wollastonite-reinforced glass-ceramics prepared from waste fluorescent glass and calcium carbonate

Synthesis and luminescence properties of nanocrystalline BaTiO3:Nd3+ obtained by sol-gel methods

Investigations of the surface morphology of Al2O3 layers by atomic force microscopy

Analysis of optical transitions of Nd3+ in YAG nanocrystallites

Development of highly transparent and conducting yttrium-doped ZnO films: the role of sol-gel stabilizers

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