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Preparation of nanocrystalline barium titanate based films with defined structure and propreties for application in microwave tunable devices

dc.contributor.advisorSrdić, Vladimir
dc.contributor.otherStojanović, Goran
dc.contributor.otherSrdić, Vladimir
dc.contributor.otherMilanović, Marija
dc.contributor.otherBobic, Jelena
dc.contributor.otherStijepović, Ivan
dc.creatorVukmirović, Jelena
dc.date.accessioned2019-12-23T16:36:43Z
dc.date.available2019-12-23T16:36:43Z
dc.date.available2020-07-03T13:53:45Z
dc.date.issued2019-03-15
dc.identifier.urihttps://nardus.mpn.gov.rs/handle/123456789/11580
dc.identifier.urihttps://www.cris.uns.ac.rs/DownloadFileServlet/Disertacija154599818251392.pdf?controlNumber=(BISIS)110058&fileName=154599818251392.pdf&id=12492&source=NaRDuS&language=srsr
dc.identifier.urihttps://www.cris.uns.ac.rs/record.jsf?recordId=110058&source=NaRDuS&language=srsr
dc.identifier.urihttps://www.cris.uns.ac.rs/DownloadFileServlet/IzvestajKomisije154599819648293.pdf?controlNumber=(BISIS)110058&fileName=154599819648293.pdf&id=12493&source=NaRDuS&language=srsr
dc.description.abstractU poslednjih nekoliko decenija, feroelektrici su prepoznati kao dobri kandidati za širok spektar primene. Barijum titanat je jedan od najčešće istraživanih perovskitnih materijala usled tipičnog feroelektričnog ponašanja na sobnoj temperaturi, sa histerezisnom zavisnosti između polarizacije i električnog polja. Specifična svojstva BaTiO3 čine ovaj materijal veoma korisnim u proizvodnji kondenzatora, memorija, senzora i dr. Pored toga, paraelektrična faza BaTiO3 ima primenu u proizvodnji mikrotalasnih tunabilnih uređaja. BaTiO3 pokazuje paralaketrično ponašanje iznad Kirijeve temperature (120°C) i veliki je izazov modifikovati materijal da bude paraelektričan na sobnoj temperaturi. Delimičnom supstitucijom Ba2+ ili Ti4+ jona, jonima Sr2+ ili Zr4+, respektivno, snižava se Kirijeva temperatura i dolazi do pomeranja fazne transformacije feroelektri čno/paraelektrično na niže temperature. Monolitna keramika na bazi bazi BaTiO3 je često istraživana kako bi se ispitale promene u strukturi i svojstvima uzrokovane dodatkom dopanata, međutim ne postoji praktična primena ovih materijala u mikrotalasnim tunabilnim tehnologijama. S druge strane, u trendu sveopšte minijaturizacije elektronskih komponenti, tanki filmovi su prepoznati kao dobri kandidati za proizvodnju tunabilnih uređaja. Jedan od ciljeva ovog istraživanja bio je ispitivanje strukturnih i funkcinalnih svojstava tankih filmova na bazi barijum titanata, BaTiO3, Ba1-xSrxTiO3 (x=0,1, 0,2, 0,3 i 0,4) i BaTi1-xZrxO3 (x=0,1 i 0,2), pripremljenih hemijskom depozicijom iz tečne faze. Metalne soli BaCO3, C4H6O4Sr i ZrOCl2 H2O i Ti(OCH2CH2CH2CH3)4 rastvorene su odvojeno u kiseloj sredini i pomešane u transparentne solove. Inkdžet štampa i spin tehnika koršćene su za depoziciju funkcionalnih filmova na bazi BaTiO3. Nakon deponovanja, pripremljeni filmovi su termički tretirani na različitim temperaturama do 1000°C. U zavisnosti od koncentracije pripremljeni su filmovi debljine od 100 do 700 nm,sa veličinom zrna od nekoliko desetina nanometara. Strukturna karakterizacija potvrdila je promene u strukturi BaTiO3 tankih filmova sa dodatkom Sr2+ i Zr4+. Tetragonalna (feroelektrična) faza BaTiO3 je potvrđena rentgenostrukturnom analizom i Ramanovom spektroskopijom. S druge strane, smanjenje tetragonalnosti je primećeno kod dopiranih uzoraka. Promene u funkcionalnosti dopiranih BaTiO3 filmova analizirane su na osnovu dielektričnih i feroelektričnih merenja. Izvršene analize su potvrdile feroelektrično ponašanje kod BaTiO3, dok se feroelektrični odgovor u tankim filmovima smanjuje sa dopiranjem. Priprema elektroda specifičnih geometrija pogodnih za tunabilna merenja različitim tehnikama depozicije bio je drugi cilj istraživanja. Tehnika spaterovanja u kombinaciji sa laserskim uklanjanjem, inkdžet štampa i fotolitografija su korišćene za pripremu kružnih i koplanarnih elektroda na površini barijum titanatnih tankih filmova. Uticaj procesnih parametara svake od pomenutih metoda na dimenzionalnu preciznost pripremljenih elektroda je bio predmet istraživanja u okviru teze. Odabrani laser se pokazao kao neprikladan za pripremu elektroda na pripremljenim barijum titanatnim tankim filmovima. Inkdžet štampa se pokazala kao korisna u pripremi elektroda mikrometarskih fimenzija, dok je za pripremu sofisticiranijih geometrija fotolitografija pokazala najbolje performanse.sr
dc.description.abstractIn past few decades, ferroelectrics are recognized as good candidates for wide range of applications. Barium titanate is one of the most investigated perovskite materials due to typical ferroelectric behavior at room temperature, with hysteresis dependence of the polarization and electric field. Specified properties of BaTiO3 make this material useful in production of capacitors, memories, sensors, etc. Nevertheless, paraelectric phase of BaTiO3 may have application in production of microwave tunable devices. Barium titanate shows paraelectric behavior at temperatures above the Currie temperature (120 °C) and it is great challenge to make material paraelectric at room temperature. Partial substitution of Ba2+ or Ti4+ ions, by Sr2+ or Zr4+, respectively, decreases the Currie temperature of barium titanate and moves phase transition ferroelectric/paraelectric to lower temperatures. Bulk BaTiO3 was often investigated in order to improve structure and functionality by addition of dopant, but do not have practical application in microwave tunable technologies. On the other hand, with the trend of overall miniaturization of electronic devices, thin films are recognized as good candidates for production of tunable devices. One of the aims in this research was investigation of structural and functional properties of barium titanate based thin films, BaTiO3, Ba1-xSrxTiO3 (x=0,1, 0,2, 0,3 i 0,4) and BaTi1-xZrxO3 (x=0,1 i 0,2), prepared by chemical solution deposition. Metal salts of BaCO3, C4H6O4Sr and ZrOCl2 H2O and Ti(OCH2CH2CH2CH3)4 were separetly disolved in acetic environment and mixed in clear transparent sols. Inkjet printing and spin coating were used for deposition of functional BaTiO3 based fims. After deposition prepared films were thermally treated at different temperatures up to 1000 °C. In dependence of sol concentration thickness of obtained films is from 100 to 700 nm and grain size is few tens of nanometers. Structural characterization confirmed changes in structure of barium titanate thin films by addition of Sr2+ i Zr4+. Tetragonal (ferroelectric) phase of BaTiO3 is confirmed by X-ray diffraction and Raman spectroscopy. On the other hand, decreasing of tetragonality was noticed in doped samples. Changes in functionality of doped BaTiO3 thin films were analyzed by dielectric and ferroelectric measurements. Performed analysis confirmed ferroelectric behavior of barium titanate thin films, and decrease in ferroelectric answer of doped films. Investigation of possibility of complex shaped electrodes preparation,suitable for tunability measurements, by different deposition techniques was the second goal of this research. Sputtering technique in combination with laser removal, inkjet printing and photolithography were used for preparation of complex circular and coplanar electrodes on the surface of barium titanate based thin films. Influence of processing parameters for the each of mentioned technique on dimensional precision of prepared electrodes was investigated. Selected laser was not appropriate for production of electrodes on prepared barium titanate based thin films. Inkjet printing was useful for production of electrodes in micrometer range, but for more sophisticated geometries photolithography shows the best performance.en
dc.languagesr (latin script)
dc.publisherУниверзитет у Новом Саду, Технолошки факултетsr
dc.rightsopenAccessen
dc.rights.urihttps://creativecommons.org/licenses/by-nd/4.0/
dc.sourceУниверзитет у Новом Садуsr
dc.subjectBarijum titanatsr
dc.subjectBarium titanateen
dc.subjecttanki filmovisr
dc.subjectinkdžet štampasr
dc.subjectferoelektricisr
dc.subjectmikrotalasni tunabilni uređajisr
dc.subjectThin filmsen
dc.subjectInkjet printingen
dc.subjectFerroelectricsen
dc.subjectMicrowave tunable devicesen
dc.titleDobijanje nanokristalnih barijum titanatnih filmova definisane strukture i svojstava za primenu u mikrotalasnim tunabilnim uređajimasr
dc.title.alternativePreparation of nanocrystalline barium titanate based films with defined structure and propreties for application in microwave tunable devicesen
dc.typedoctoralThesisen
dc.rights.licenseBY-ND
dc.identifier.fulltexthttp://nardus.mpn.gov.rs/bitstream/id/40101/IzvestajKomisije.pdf
dc.identifier.fulltexthttp://nardus.mpn.gov.rs/bitstream/id/40100/Disertacija.pdf
dc.identifier.fulltexthttps://nardus.mpn.gov.rs/bitstream/id/40101/IzvestajKomisije.pdf
dc.identifier.fulltexthttps://nardus.mpn.gov.rs/bitstream/id/40100/Disertacija.pdf
dc.identifier.rcubhttps://hdl.handle.net/21.15107/rcub_nardus_11580


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