Cation Ordering and Ferroelectric Properties of Epitaxial Pb(SC, Ta)O3 Thin Films Grown by Pulsed Laser Deposition PDF Download
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Author: Anuj Chopra
Publisher:
ISBN:
Category :
Languages : en
Pages : 110
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Book Description
PbSc0.5Ta0.5O3 (PST) is an example of relaxor ferroelectrics having two B-site cations in the perovskite structure, which gives rise to B-site cation-ordering and disordering. In addition, PST is a candidate for uncooled infrared detector applications. Epitaxial PST films were deposited on different single-crystal substrates and epitaxial electrode layers, respectively, by pulsed laser deposition. Films grown in optimised conditions were phase-pure perovskites. The crystallographic structure and epitaxial quality of the films were investigated by X-ray diffraction and transmission electron microscopy. Further, it was found that the degree of cation-ordering and the size of the ordered regions can be varied by changing the thickness of the films and by substrate-induced strain. Cation-ordered epitaxial PST thin films with good ferroelectric properties were also successfully deposited on buffered Si(100) substrates. Piezoelectric and dielectric non-linearities as well as phase transitions of different order were observed near room temperature.
Author: Anuj Chopra
Publisher:
ISBN:
Category :
Languages : en
Pages : 110
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Book Description
PbSc0.5Ta0.5O3 (PST) is an example of relaxor ferroelectrics having two B-site cations in the perovskite structure, which gives rise to B-site cation-ordering and disordering. In addition, PST is a candidate for uncooled infrared detector applications. Epitaxial PST films were deposited on different single-crystal substrates and epitaxial electrode layers, respectively, by pulsed laser deposition. Films grown in optimised conditions were phase-pure perovskites. The crystallographic structure and epitaxial quality of the films were investigated by X-ray diffraction and transmission electron microscopy. Further, it was found that the degree of cation-ordering and the size of the ordered regions can be varied by changing the thickness of the films and by substrate-induced strain. Cation-ordered epitaxial PST thin films with good ferroelectric properties were also successfully deposited on buffered Si(100) substrates. Piezoelectric and dielectric non-linearities as well as phase transitions of different order were observed near room temperature.
Author: James S. Speck
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 588
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Book Description
Our understanding and control of epitaxial oxide heterostructures has progressed along multiple frontiers including magnetic, dielectric, ferroelectric, and superconducting oxide materials. This has resulted in both independent rediscovery and the successful borrowing of ideas from ceramic science, solid-state physics, and semiconductor epitaxy. A new field of materials science has emerged which aims at the use of the intrinsic properties of various oxide materials in single-crystal thin-film form. Exploiting the potential of these materials, however, will only be possible if many fundamental and engineering questions can be answered. This book represents continued progress toward fulfilling that promise. Technical information on epitaxial oxide thin films from industry, academia and government laboratories is presented. Topics include: dielectrics; ferroelectrics; optics; superconductors; magnetics; magnetoresistance.
Author:
Publisher:
ISBN:
Category : Dielectrics
Languages : en
Pages : 514
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Author:
Publisher:
ISBN:
Category : Dielectrics
Languages : en
Pages : 448
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Author: Ashish Garg
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Epitaxial oxide thin films are used in many technologically important device applications. This work deals with the deposition and characterization of epitaxial WO3 and SrBi2Ta2O9 (SBT) thin films on single crystal oxide substrates. WO3 thin films were chosen as a subject of study because of recent findings of superconductivity at surfaces and twin boundaries in the bulk form of this oxide. Highly epitaxial thin films would be desirable in order to be able to create a device within a film without patterning it, by locally creating superconducting regions (e.g. twins) within an otherwise defect free film by reducing or doping the film with Na. Films were deposited by reactive magnetron sputtering at various temperatures on single crystal SrTiO3 (100) and R-sapphire substrates. X-ray diffraction studies showed that the optimised films were highly (001) oriented, quality of epitaxy improving with decreasing deposition temperature. AFM studies revealed columnar growth of these films. Films were heat treated with Na vapour in order to reduce or dope them with Na. Low temperature measurements of the reduced films did not show existence of any superconductivity. SBT is a ferroelectric oxide and its thin films are attractive candidates for non-volatile ferroelectric random access memory (FRAM) applications. High structural anisotropy leads to a high degree of anisotropy in its ferroelectric properties which makes it essential to study epitaxial SBT films of different orientations. In this study, SBT films of different orientations were deposited on different single crystal substrates by pulsed laser ablation. Highly epitaxial c-axis oriented and smooth SBT films were deposited on SrTiO3 (100) substrates. AFM studies revealed the growth of these films by 3-D Stranski-Krastanov mode. However, these films did not exhibit any ferroelectric activity. Highly epitaxial (116)-oriented films were deposited on SrTiO3 (110) substrates. These films were also very smooth with root mean square (RMS) roughness of 15-20 Å. Films deposited on TiO2 (110) were partially a-/b-axis oriented and showed the formation of c-axis oriented SBT and many impurities. Completely a-/b-axis oriented SBT films were deposited on LaSrAlO4 (110) substrates. Films deposited at non-optimal growth temperatures showed the formation of many impurities. Attempts were also made towards depositing Sr2RuO4 films on LaSrAlO4 (110) substrates, which can act as a bottom electrode for ferroelectric SBT films.
Author: Satishchandra B. Ogale
Publisher: Springer Science & Business Media
ISBN: 9780387258027
Category : Technology & Engineering
Languages : en
Pages : 440
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Book Description
Oxides form a broad subject area of research and technology development which encompasses different disciplines such as materials science, solid state chemistry, physics etc. The aim of this book is to demonstrate the interplay of these fields and to provide an introduction to the techniques and methodologies involving film growth, characterization and device processing. The literature in this field is thus fairly scattered in different research journals covering one or the other aspect of the specific activity. This situation calls for a book that will consolidate this information and thus enable a beginner as well as an expert to get an overall perspective of the field, its foundations, and its projected progress.
Author: David K. Fork
Publisher: Mrs Proceedings
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 432
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The MRS Symposium Proceeding series is an internationally recognised reference suitable for researchers and practitioners.
Author: Joseph A. Cianfrone
Publisher:
ISBN:
Category :
Languages : en
Pages :
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ABSTRACT: Oxide electronics offer a wide array of interesting properties, including ferromagnetism, ferroelectricity and superconductivity. This dissertation investigates the transport, magnetic, and structural properties of several perovskite and spinel material systems, with particular interest in their manipulation at the nanoscale through the growth of functional heterostructures. Spinel phase ZnCo2O4 is investigated as a ferromagnetic semiconductor whose carrier type changes with oxygen concentration. The perovskite system of K(Ta, Nb)O3 is investigated for its interesting properties as a solid solution which exhibits a ferroelectric transition dependent on composition. Its thin film epitaxial growth modes are investigated via reflection high energy electron diffraction, with particular attention paid to the volatile potassium ion. Superlattices of K(Ta, Nb)O3 and SrTiO3 are also investigated for the possibility of dielectric enhancement and conductive interfaces. The multiferroic properties of BaFeO3 K(Ta, Nb)O3 superlattices are investigated, with particular attention paid to the role of magnetoelectric coupling and strain as stabilizing mechanisms.
Author: Jong-Souk Yeo
Publisher:
ISBN:
Category : Ferroelectric thin films
Languages : en
Pages : 190
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Author: Christopher Michael Long
Publisher:
ISBN:
Category :
Languages : en
Pages : 122
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