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Microstructure evolution in SrTiO3 with different Sr/Ti ratios = Razvoj mikrostrukture v SrTiO3 ob različnem razmerju Sr/TiŠturm, Sašo ; Rečnik, Aleksander ; Čeh, Miran, (materiali)Mikrostruktura ▫$SrTiO_3$▫ je v veliki meri odvisna od razmerja Sr/Ti. V primeru sintranja ▫$SrTiO_3$▫ s prebitnim SrO opazujemo napredujočo anizotropno rast zrn s politipnimi fazami s formulo ... ▫$Sf_{n+1}Ti_nO_{3n+1}$▫. Na visoko temperaturnem rentgenskem spektru smo določili samo prve tri homogene faze: ▫$Sr_2TiO_4$▫, ▫$Sr_3Ti_2O_7$▫ in ▫$Sr_4Ti_3O_{10}$▫, pri čemerje prva stabilna faza pri nizkih temperaturah ▫$Sr_2TiO_4$▫ (T<1200°C). Mikrostruktura ▫$SrTiO_3$▫ s prebitnim SrO pokaže značilno preraščena anizotropna zrna z velikim medosnim razmerjem, kjer so lamele politipov vključene v matrico perovskita. Visoka anizotropija in "sendvič" struktura zrns politipnimi lamelami kaže, da je rast teh zrn kontrolirana z rastjo vraščenih politipnih lamel. Poleg politipnih lamel na polirani in jedkani površini perovskitnih zrn opazimo tudi kvadratne izjedkanine z definirano orientacijo v odnosu na perovskitno matrico, dvojčkom podobna zrna z vraščenimi politipnimi lamelami in nenavadne oblike perovskitnih matričnih zrn paličnih oblik pravokotnega preseka. TEM raziskave pokažejo, da lahko tako izolirane kot urejene ploskovne napake tvorijo pravokotne vzorce, ki se razraščajo po katerikoli ravnini družine {100}. Urejene ploskovne napake tu in tam spremenijo smer znotraj {100} družine ravnin. Poleg posameznih ploskovnih napak in politipnih lamel opazimo znotraj perovskitne matrice tudi zaključena pravokotna telesa, ki gradijo večkrat transponirane družine politipnih lamel okoli iste osi tako, da vogali telesa ustrezajo {110} ravninam perovskita. Izmerjena razdalja med planarnimi napakami znotraj urejenih politipnih ravnin je v skladu z rezultati dobljenimi iz rentgenskih spektrov.Source: Kovine zlitine tehnologije = Metals alloys technologies. - ISSN 1318-0010 (Letn. 33, št. 6, nov.-dec. 1999, str. 479-486)Type of material - article, component partPublish date - 1999Language - englishCOBISS.SI-ID - 204970
Author
Šturm, Sašo |
Rečnik, Aleksander |
Čeh, Miran, (materiali)
Topics
stroncijev titanat |
sinteza |
sintranje |
kristalna struktura |
mikrostruktura
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source: Kovine zlitine tehnologije = Metals alloys technologies. - ISSN 1318-0010 (Letn. 33, št. 6, nov.-dec. 1999, str. 479-486)
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Šturm, Sašo | 19030 |
Rečnik, Aleksander | 10083 |
Čeh, Miran, (materiali) | 03937 |
Source: Personal bibliographies
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