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Strukturna karakterizacija faznega sistema ▫$(K, Na)NbO_3$▫ ▫$SrZrO_3$▫Kržišnik, MojcaNamen diplomskega dela sta bili sinteza okolju prijaznega feroelektrika, trdne raztopine v (1-x)K0.5Na0.5NbO3 - xSrZrO3 z vrednostmi x = 0.05 - 0.33 izoksidov, tartratov in nitratov v trdnem stanju ... ter strukturna karakterizacija omenjenega sistema, določena na podlagi granulometričnih in rentgenskih analiz, raziskav s segrevalnim mikroskopom in vrstičnim elektronskim mikroskopom ter meritvami dielektričnih lastnosti v odvisnosti od temperature. V preiskovanem sistemu se je tvorila trdna raztopina SrZrO3 v K0.5Na0.5NbO3. Kubično perovskitno strukturo imajo vzorci z vrednostmi x = 0.10 - 0.33, v katerih z naraščajočo vsebnostjo SrZrO3 naraščajo celični parametri zaradi vgrajevanja velikih Zr4+ ionov v trdno raztopino K0.5Na0.5NbO3. Vzorec z vrednostjo x = 0.05 ima ortorombsko perovskitno strukturo. Samo vzorec z vrednostjo x = 0.05 kaže fazni prehod iz ortorombske v tertragonalno fazo pri 140°C ter fazni prehod iz tetragonalne v kubično perovskitno fazo pri 280°C oziroma 245°C. Ker je fazni prehod pri 245°C za meritve pri 1,10 in 100 kHz pri isti temperaturi, je omenjeni vzorec klasični feroelektrik. Vzorca z vrednostjo x = 0.05 in 0.10 presegata 92 % teoretične gostote, preostali vzorci preiskovanega sistema pa dosegajo precej nižje gostote. Sintetizirano keramiko sestavljajo submikronska do nekaj mikronska zrna v obliki kocke. V prevladujoči trdni raztopini K0.5Na0.5NbO3 -SrZr03 se pojavljajo drobne ter enakomerno razporejene pore in vključki svetle faze, bogate z ZrO2.Type of material - undergraduate thesisPublication and manufacture - Ljubljana : [M. Kržišnik], 2005Language - slovenianCOBISS.SI-ID - 19087143
Author
Kržišnik, Mojca
Other authors
Mirtič, Breda |
Kosec, Marija, 1947-2012
Topics
feroelektriki |
nelinearni dielektriki |
relaksorji |
fazni sistem |
sintranje |
lastnosti materialov
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Library | Call number – location, accession no. ... | Copy status |
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NTF, Department of Geology, Lj. | Geologija M KRŽIŠNIK Mojca Strukturna IN: 000013966 |
available - outside loan, loan period: 5 days |
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Database name | Field | Year |
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Kržišnik, Mojca | ![]() |
Mirtič, Breda | 07177 |
Kosec, Marija, 1947-2012 | 02627 |
Source: Personal bibliographies
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