Application of the intergranular impedance model in correlating microstructure and electrical properties of doped BaTiO3
| Autor: | Vladimir B. Pavlović, D. Mancic, Lj. Kocic, Vojislav V. Mitić, Vesna Paunović |
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| Rok vydání: | 2009 |
| Předmět: |
Materials science
klasteri microstructure mikrostruktura 02 engineering and technology lcsh:Chemical technology 01 natural sciences barium-titanate Condensed Matter::Materials Science chemistry.chemical_compound Fractal 0103 physical sciences Materials Chemistry Cluster (physics) lcsh:TP1-1185 clusters Ceramic Electrical impedance 010302 applied physics intergranular impedance Condensed matter physics fraktali Metals and Alloys 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure barijum-titanat Titanate chemistry fractals visual_art Barium titanate Ceramics and Composites visual_art.visual_art_medium Grain boundary optimizacija 0210 nano-technology optimization |
| Zdroj: | Science of Sintering, Vol 41, Iss 3, Pp 247-256 (2009) Science of Sintering |
| ISSN: | 1820-7413 0350-820X |
| Popis: | Microstructure properties of barium-titanate based materials, expressed in grain boundary contacts, are of basic importance for electric properties of this material. In this study, the model of intergranular impedance applied on a two-grain contact is considered. Globally, a BaTiO3-ceramics sample consists of a large number of mutually contacted grains, which form clusters. Such clusters can be presented as specific fractal formations. For each of them, it is possible to establish the equivalent electrical model and, for a defined set of input parameters, using symbolic analysis, obtain the frequency diagram. The influence of fractal structure is especially stressed. Realizing the totality of relations between cluster grain groups, their microelectrical schemes and corresponding frequency characteristics, on one hand, and the global equivalent electrical scheme and corresponding acquired frequency characteristics of BaTiO3-ceramics samples, on the other hand, we set a goal of correlating experimental results with the summing effect of microelectric equivalent schemes. The model is successfully tested on doped barium-titanate ceramics. Mikrostrukturna svojstva materijala na bazi barijum-titanata, izražena kontaktima granica zrna od fundamentalne su važnosti za električna svojstva ovih materijala. U ovom radu razmatrana je primena modela impedanse između dva zrna na kontakt dva zrna. Globalno posmatrano, uzorak BaTiO3-keramike sastoji se od ogromnog broja zrna u međusobnom kontaktu koji formiraju klastere. Takvi klasteri mogu biti predstavljeni kao specifične fraktalne formacije. Za svaku od ovih formacija moguće je uspostaviti ekvivalentni električni model za definisani set ulaznih parametara koristeći metod simboličke analize i dobiti odgovarajuću frekventnu karakteristiku. Posebno je naglašen uticaj fraktalne strukture. Realizujući kompletnu relaciju između klastera zrna, njihovih mikroelektričnih šema i odgovarajućih frekventnih karakteristika s jedne strane, i globalnih ekvivalentnih električnih šema i odgovarajućih frekventnih karakteristika uzoraka BaTiO3-keramike, s druge strane, uspostavljamo set ciljanih koincidentnih eksperimentalnih rezultata sa sumarnim efektima izračunavanih mikroelektričnih ekvivalentnih šema. Model je uspešno testiran na uzorcima barijum-titanatne keramike. |
| Databáze: | OpenAIRE |
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