Colorimetric Gradation in RGB-Space as a Method for Detecting Structural Changes in Ceramic Materials

Chetverikova, A. G.; Kanygina, O. N.

doi:10.1007/s11018-016-1019-9

Cited by 6 publications

(3 citation statements)

References 2 publications

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“…The algorithm for studying the processes of structural transformations in a dispersed clay system exposed to MW radiation, in our opinion, should be as follows: i) analysis of the morphology of the dispersed system at the meso-level by processing optical images using colorimetric gradation methods, fractal and wavelet analyses; ii) registration of the formation of secondary phase morphologies at the micron and submicron levels by X-ray patterns analysis. The method of colorimetric gradation is very effective in computer processing of optical images of clay powders surfaces [6]. In modern colorimetry, several color models of different target orientation are operating [7], however, for the analysis of structural changes in aluminosilicates, the XYZ and L*a*b* models are the most convenient [8].…”

Section: Cristalizaram a Composição Do Ambiente Na Câmara De Micromentioning

confidence: 99%

“…3 shows wavelet spectrograms carrying information on the distribution of mesostructural elements (particles) on the surface of powders. The abscissa is the wavelet (3)(4)(5)(6)(7) represents the distribution of larger elements; the upper part (7)(8)(9)(10)(11) gives a generalized picture of the surface. The correlation between the wavelet and the point profile in its vicinity is determined by the color of the corresponding region of the wavelet spectrogram [16]: white is the maximum and dark blue is the minimum of coincidences.…”

Section: Influence Of the External Environment On Structural Changes mentioning

confidence: 99%

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Evolution of phase morphology in dispersed clay systems under the microwave irradiation

2018

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The results of a study of the microwave emission effect (power 700 W, frequency 2.45 GHz) on the structural changes in natural clay particles with effective diameters D≤630 μm are presented. The influence of the irradiation time (10 and 20 min) and the environment in the microwave chamber (atmospheric air and air saturated with water vapor) on the structural changes occurring in the particles were traced. During the first 10 min, capillary water was completely removed and agglomeration was carried out by attaching single dispersed particles (diffusion limited aggregation model). At the second stage (10-20 min), the already formed agglomerates grew (cluster-cluster aggregation model). A complex of independent optical-physical methods was used to analyze weak structural changes, including X-ray diffraction analysis, colorimetry and wavelet analysis. This approach increased the information content and reliability of measurements, quantitatively characterizing the structural responses in disperse clay systems. In the air, the removal of capillary water was accompanied by agglomerations of particles and polymorphic transformations of oxides: montmorillonite was completely decomposed and amorphous phases, in particular CaCO3, crystallized. The composition of the environment in the microwave chamber affected the type of phase transformations in iron compounds: iron-aluminum silicate (Fe2Al4Si5O18) was formed in the air; magnetite Fe.Fe2O4 (Fe3O4) appeared in the water vapor medium. The carried-out studies with the developed set of experimental methods indicated the possibility of regulating the processes of structure formation in dispersed clay systems by optimizing the regimes of exposure to microwave radiation.

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Section: Cristalizaram a Composição Do Ambiente Na Câmara De Micromentioning

confidence: 99%

Section: Influence Of the External Environment On Structural Changes mentioning

confidence: 99%

Evolution of phase morphology in dispersed clay systems under the microwave irradiation

2018

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“…Целью исследования, результаты которого изложены в настоящей работы, являлось изучение структурных откликов оксидов железа на воздействие микроволнового излучения с оценкой возможности получения маггемита из гематита. [10].…”

Section: Introductionunclassified

Фазовые Превращения В Оксидах Железа Под Действием Микроволнового Излучения

Каныгина¹,

Бердинский²,

Филяк³

et al. 2020

Журнал Технической Физики

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It is shown that microwave radiation induces structure changes and, consequently, magnetic phase transitions in iron oxide alpha-Fe2O3. We subjected finely dispersed partially amorphized particles of iron oxide Fe2O3 to 10-minute-long microwave field treatment in a humid air environment. This resulted in a reduction of the hematite crystalline phase by 40%. At the same time the total fraction of crystalline components increased due to the creation of a new ferromagnetic modification which is maghemite alpha-Fe2O3. The original antiferromagnetic samples and the finial ferrimagnetic batches were powders composed of spherical particles with similar values of the area of a coherent X-ray scattering area (40-60 nm).

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