Preparation and characterization of doped lead zirconate titanate Pb(ZrxTi1-x)O₃ films

dc.contributor.authorChang, Jhing-Fangen
dc.contributor.committeechairDesu, Seshu B.en
dc.contributor.committeememberReynolds, William T. Jr.en
dc.contributor.committeememberCox, David F.en
dc.contributor.departmentMaterials Science and Engineeringen
dc.date.accessioned2014-03-14T21:35:31Zen
dc.date.adate2010-05-04en
dc.date.available2014-03-14T21:35:31Zen
dc.date.issued1992-08-05en
dc.date.rdate2010-05-04en
dc.date.sdate2010-05-04en
dc.description.abstractUndoped and doped Pb(Zr<sub>x</sub>Ti<sub>1-x</sub>)O₃, i. e. PZT, ferroelectric thin films were prepared by chemical solution deposition and spin-coating method. The precursors for making the undoped PZT films were derived from lead acetate, zirconium n-propoxide, and titanium iso-propoxide. In addition, lanthanum acetylacetonate, neodymium acetate, and niobium ethoxide were introduced into the precursor solution to accomplish doping of the corresponding elements. Both doped and undoped PZT films were coated onto Pt/Ti/SiO₂/Si, RuO<sub>x</sub> and single-crystal sapphire substrates of various thickness and annealed at a range of temperatures and times. The effects of dopants were studied in terms of the Curie temperature, crystal distortion, transformation temperature, microstructure, optical properties, and electrical properties. In addition to the dopant effect, the effects of substrates were also investigated with regard to crystallization and preferred orientation. The Curie temperature of the doped and undoped PZT films was determined by in-situ hot-stage transmission electron microscope (TEM) and compared with those of bulk ceramics. Lattice distortion and phase transformation were determined by x-ray diffraction (XRD). Microstructure of the films was characterized by using optical microscopy, scanning electron microscopy (SEM), and scanning transmission electron microscopy (STEM). Optical properties were characterized by a UV-VIS-NIR scanning spectrophotometer and electrical properties and fatigue testing were measured on a standardized RT66A using a Virtual-Ground circuit. It was observed that the addition of Nd and La dopants tends to enhance perovskite phase formation and improve electrical properties of PZT films. Higher refractive indices in La and Nd-doped PZT films imply that packing densities of PZT films are improved by adding dopants. Furthermore, the lower leakage currents and improved fatigue properties in PZT films were also observed by the addition of Nb dopants.en
dc.description.degreeMaster of Scienceen
dc.format.extentxiii, 129 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-05042010-020142en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-05042010-020142/en
dc.identifier.urihttp://hdl.handle.net/10919/42466en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1992.C524.pdfen
dc.relation.isformatofOCLC# 27407915en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1992.C524en
dc.subject.lcshDoped semiconductor superlatticesen
dc.subject.lcshLead zirconate titanateen
dc.titlePreparation and characterization of doped lead zirconate titanate Pb(Zr<sub>x</sub>Ti<sub>1-x</sub>)O₃ filmsen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineMaterials Science and Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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