Готові списки джерел за темами / POTASSIUM SODIUM NIOBATE ( KNN ) / Дисертації
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Дисертації з теми "POTASSIUM SODIUM NIOBATE ( KNN )"

Автор: Grafiati
Опубліковано: 21 жовтня 2023

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1

Rafiq, Muhammad Asif. "Electromechanical properties of engineered lead free potassium sodium niobate based materials." Doctoral thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/14182.

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Анотація:
Doutoramento em Ciência e Engenharia de Materiais<br>K0.5Na0.5NbO3 (KNN), is the most promising lead free material for substituting lead zirconate titanate (PZT) which is still the market leader used for sensors and actuators. To make KNN a real competitor, it is necessary to understand and to improve its properties. This goal is pursued in the present work via different approaches aiming to study KNN intrinsic properties and then to identify appropriate strategies like doping and texturing for designing better KNN materials for an intended application. Hence, polycrystalline KNN cerami
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2

Lusiola, Tony. "Synthesis and processing of KNN powders and thick films for MEMS devices." Thesis, Cranfield University, 2012. http://dspace.lib.cranfield.ac.uk/handle/1826/7846.

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Анотація:
Pb-free piezoelectric materials have grown in importance through increased environmental concern related to the presence of Pb and the subsequent legislation that has arisen including directives such as Waste Electrical and Electronic Equipment (WEEE) and the Restriction of Hazardous Substances Directive (RoHS). While much progress has been made on producing Pb-free bulk materials, the need to integrate these next generation Pb-free piezoelectric materials with substrates to form functional micro devices has received less attention and raises a number of challenges. With respect to the high te
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3

Pinho, Rui Manuel de Oliveira. "Electromechanical properties of textured K0.5Na0.5NbO3 ceramics." Master's thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/13933.

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Анотація:
Mestrado em Engenharia de Materiais<br>This work is about lead-free ceramic materials intended for electromechanical applications and candidates to replace lead-based electroceramics. One of the most widely used piezoelectric ceramics is lead zirconate titanate (PZT). However, it contains more than 60% of lead and it is toxic for humans and environment. In 2003, a directive from European Union has prohibited the use of potentially hazardous elements as lead. Due to the lack of competitive materials for PZT replacement an exception was created until a competitive alternative be found. Potassium
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4

Santos, André Pereira dos. "Strain effect on the properties of K0.5Na0.5NbO3 films." Master's thesis, Universidade de Aveiro, 2017. http://hdl.handle.net/10773/22592.

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Mestrado em Engenharia de Materiais<br>Este trabalho é sobre materiais cerâmicos isentos de chumbo destinados a aplicações electromecânicas e candidatos à substituição de electrocerâmicos à base de chumbo. O titanato zirconato de chumbo (PZT) é o cerâmico piezoeléctrico mais utilizado em todo o mundo. No entanto, contém mais de 60 % de chumbo que é um elemento tóxico para os seres humanos e para o ambiente. Em 2003, a União Europeia aprovou uma directiva que proíbe e restringe o uso de elementos potencialmente perigosos, tais como o chumbo. Devido à inexistência de materiais aptos para a subs
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5

Wegrzyn, Margaret. "Sodium potassium niobate based piezoelectric ceramics." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/sodium-potassium-niobate-based-piezoelectric-ceramics(8f2d3804-5012-4562-8bb0-2b325b754d13).html.

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NKN doped samples, (100-x)NKN-xSBN (0 ≤ x ≤ 10) were produced using the conventional mixed oxide route with 0.45 wt% Fe2O3 sintering aid (xSBNF). After 20-24 hours mixing, samples were calcined at 850°C and sintered at 1100–1140°C (± 180°C/hour) for 4 hours. By XRD 4 mol% SBN was found to be the solubility limit for single phase structure. By SEM, second phases were visible when 2 ≤ x ≤ 4; their structure was subsequently shown to be tungsten bronze type (TBT). 2-4 SBNF samples were high density, over 96% theoretical. For x = 0, TC = 457°C, TO-T = 234°C, Pr = 22 μC/cm2 and EC = 16.5 kV/cm. TC
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6

Zhang, Nan. "Phases and Structures of Sodium Potassium Niobate." Thesis, University of Oxford, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.526133.

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7

O'Callaghan, Samantha Ann. "Sol-gel synthesis of nanosized sodium potassium niobate-based piezoelectric ceramics." Thesis, University of Cambridge, 2014. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.707999.

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8

Li, Huidong Shih Wei-Heng Shih Wan Y. "Sodium potassium niobate-based lead-free piezoelectric ceramics: bulk and freestanding thick films /." Philadelphia, Pa. : Drexel University, 2008. http://hdl.handle.net/1860/2799.

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9

Kim, Jang-Yong. "Novel tantalate-niobate films for microwaves." Licentiate thesis, KTH, Microelectronics and Information Technology, IMIT, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-489.

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Анотація:
<p>Microwave materials have been widely used in a variety of applications ranging from communication devices to military satellite services, and the study of materials properties at microwave frequencies and the development of functional microwave materials have always been among the most active areas in solid-state physics, materials science, and electrical and electronic engineering. In recent years, the increasing requirements for the development of high speed, high frequency circuits and systems require complete understanding of the properties of materials function at microwave frequencies
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10

Pacher, Fernandes Rodrigo [Verfasser]. "Piezoresponse Force Microscopy study of potassium sodium niobate and bismuth sodium titanate based lead-free ferroelectric materials / Rodrigo Pacher Fernandes." München : Verlag Dr. Hut, 2014. http://d-nb.info/1049362829/34.

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11

Sadraei, Atieh. "Microfabrication and electrical characterization of lead-free sodium potassium niobate thin film ribbons on conformal substrates." Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/123646.

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Анотація:
Thesis: S.M., Massachusetts Institute of Technology, School of Architecture and Planning, Program in Media Arts and Sciences, 2019<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 40-41).<br>There have been recent concerns regarding the use, recycling, and disposal of the predominantly used leaded piezoelectric ceramic- Lead Zirconate Titanate (PZT). The European Union has initiated restricting the use of lead in commercial products, with countries such as China and Japan. These regulations provide further motivation for the development of an alternative t
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12

von, Helden Leonard. "Ferroelectric domains in potassium sodium niobate thin films: impact of epitaxial strain on thermally induced phase transitions." Doctoral thesis, Humboldt-Universität zu Berlin, 2019. http://dx.doi.org/10.18452/20185.

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Анотація:
Gegenstand dieser Arbeit ist die experimentelle Untersuchung der Verspannungs-Temperatur-Phasenbeziehungen in epitaktischen KxNa1-xNbO3 Dünnschichten, sowie deren Zusammenhang mit ferro- und piezoelektrischen Eigenschaften. Die präsentierten Ergebnisse ermöglichen es KxNa1-xNbO3 Dünnschichten für neuartige technologische Anwendung zu optimieren. Zunächst wird eine detaillierte strukturelle Untersuchung der ferroelektrischen Domänenstruktur in epitaktischen K0.7Na0.3NbO3 Schichten auf (110) TbScO3 vorgestellt. Eine Analyse der ferroelektrischen Domänenstruktur mittels lateral aufgelöster Piezo
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13

Körbel, Sabine [Verfasser], and Christian [Akademischer Betreuer] Elsässer. "Atomistic modeling of Cu doping in the lead-free ferroelectric potassium sodium niobate = Atomistische Modellierung des Cu-dotierten bleifreien Ferroelektrikums Kalium-Natrium-Niobat." Freiburg : Universität, 2012. http://d-nb.info/1123473625/34.

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14

Schmidbauer, Martin [Gutachter], Christoph [Gutachter] Koch, and Brice [Gutachter] Gautier. "Ferroelectric domains in potassium sodium niobate thin films: impact of epitaxial strain on thermally induced phase transitions / Gutachter: Martin Schmidbauer, Christoph Koch, Brice Gautier." Berlin : Humboldt-Universität zu Berlin, 2019. http://d-nb.info/120492404X/34.

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15

Kim, Jang-Yong. "Processing and On-Wafer Test of Ferroelectric Film Microwave Varactors." Doctoral thesis, Stockholm : Information and Communication Technology (ICT), Kungl. Tekniska högskolan (KTH), 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4226.

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16

Řeháková, Bára. "Syntéza a příprava bezolovnaté piezokeramiky." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-378411.

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Анотація:
The topic of this thesis is synthesis and preparation of lead-free pizoceramic with perovskite structure, in particular potassium-sodium niobate (KNN). In theoretical part are described possibilities of KNN synthesis and of it’s shaping and sintering. Experimental part deals with three types of synthesis described in the theretical part – solid state reaction, hydrothermal synthesis, sol-gel synthesis, and subconsequentional shaping of prepared powders by uniaxial pressing, cold isostatic pressure method, sintering (classical in oven, in some cases SPS – spark plasma sintering) of such green b
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17

Nedjar, Ratiba. "Intercalation et echange cationique dans les oxydes lamellaires et a tunnels entrecroises." Caen, 1987. http://www.theses.fr/1987CAEN2040.

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18

Karkuszová, Karina. "Příprava keramických materiálů pro piezoelektrické aplikace." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417056.

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Анотація:
The content of this thesis is about preparation and processing of lead-free piezoceramic materials with perovskite structure. Potassium sodium niobate (KNN) powder was prepared by solid state reaction (SSR) and liquid phase reaction (sol-gel reaction). The powders were formed by uniaxial and isostatic pressing and further sintered. The density, grain size and morphology were determined on the sintered samples. The powder, synthesised by SSR and sintered in a conventional furnace, was chosen as a standard. The maximum density achieved on samples after optimization of sintering cycle was 93 %TD.
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19

Barla, Durjodhan. "Synthesis of Tantalum Doped Sodium-Potassium Niobate System by Solid state Reaction Technique." Thesis, 2009. http://ethesis.nitrkl.ac.in/1154/1/bunty-final_thesis.pdf.

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Анотація:
Due to the toxicity of lead, there is an urgent need to develop lead-free alternatives to replace the currently dominant lead-based piezoelectrics such as lead zirconate titanate (PZT). (Na0.5K0.5)NbO3 (NKN)-based piezoelectrics are promising because of their relatively high Curie temperatures and piezoelectric coefficients among the non-lead piezoelectrics.How ever, it is difficult to sinter. Sodium potassium niobate [(Na0.5K0.5)NbO3 or NKN], the main material system on which the research of this thesis work is centered. The challenges for lead-free materials to replace lead-based families a
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20

Bansal, Vinay. "Synthesis and Characterization of Sodium Potassium Niobate (Na0.5K0.5NbO3)–Nickel-Zinc Ferrite (Ni0.6Zn0.4Fe2O4)Composite." Thesis, 2010. http://ethesis.nitrkl.ac.in/2015/1/vinay_thesis_final.pdf.

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Анотація:
The present project dealt with the preparation of a multiferroic composite (Na0.5K0.5)NbO3-(Ni0.6Zn0.4)Fe2O4 in which the constituent materials (Na0.5K0.5)NbO3 [NKN] and (Ni0.6Zn0.4)Fe2O4 [NZFO] were prepared by coating method and combustion method respectively. These were mixed in required proportion and densified by conventional sintering process to form composite. Four compositions were prepared to form composite (1-x)(Na0.5K0.5)NbO3-x(Ni0.6Zn0.4)Fe2O4 [NKN-NZFO] ceramics, where x=0.01, 0.10, 0.15 and 0.20. XRD of the sintered and ground sample showed no reaction between individual phases
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21

HUANG, YAO-HSIEN, and 黃耀賢. "Fabrication of Flexible Electrospun Piezoelectric Composites of Potassium Sodium Niobate Nanofibers Doped with Graphene." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/b98u47.

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Анотація:
碩士<br>逢甲大學<br>材料科學與工程學系<br>106<br>This work aims at the following aspects including (a) preparation of KxNa1-xNbO3 (KNN) nanofibers via both sol-gel and electrospinning (ESP); (b) production of rGO/KNN composite nanofibers by ESP and liquid doping method; (c) four-point probe conductivity test of rGO/KNN composite nanofiber on silicon substrate; and (d) piezoelectric force microscope test of rGO/KNN composite nanofibers deposited on silicon substrate. The results show that KNN nanofibers of uniform size and density by optimzing the process parameters to form an highly oriented and aligned nano
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22

Li, Carlos, and 李俊慶. "Fabrication Potassium Sodium Niobate Nanowires by Electrospinning Technique and Their Characterization by Piezoelectric Force Microscopy." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/11236132773222767194.

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碩士<br>逢甲大學<br>材料與製造工程所<br>100<br>The goal of this study is to investigate the fabrication potassium sodium niobate (KxNa1-xNbO3,KNN) nanowires and nanofibers by electrospinning process (ESP) and the characterization of KNN nanowires by piezoelectric force microscopy (PFM). There are a number of key parameters involved in electrospinning process such as viscosity and surface tension of precursor solution as well as the Coulombic force during the electrospinning. The effect of molecular weight and concentration of polyvinyl alcohol (PVA) on viscosity and electrospinning performance was analyzed.
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23

Yi-HongZou and 鄒乙弘. "Development of the Li-Doped Potassium Sodium Niobate Piezoelectric Ceramics with High Electromechanical Coupling Coefficient and Applied to Single-Element Ultrasound Transducers." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/03209147188193363951.

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碩士<br>國立成功大學<br>電機工程學系碩博士班<br>101<br>In this study, the development of lead-free (1-x)(Na0.535K0.48)NbO3－xLiNbO3 (NKLN) ceramics were investigated and the phase transition behavior of material, sintering temperature and poling condition were discussed. In NKLN ceramics, it was observed that the morphotropic phase boundary (MPB) not only contented the orthorhombic and tetragonal phases, but also had the formation of monoclinic phase. The best piezoelectric properties of NKLN ceramics with kp = 42%、kt = 52% were obtained at x = 0.05. In 0.95NKN-0.05LN ceramics, the sintering temperature was red
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24

Das, Suman. "Synthesis and Investigations of a Few Anode Materials for Alkali-based Rechargeable Batteries." Thesis, 2017. https://etd.iisc.ac.in/handle/2005/4272.

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The present Thesis explores a few novel anode materials for both lithium-ion and sodium-ion rechargeable batteries. A series of layered metal titanium niobates have been synthesised and their electrochemical energy storage properties, ion transport, and reaction mechanisms are studied in detail. Alkali-titanium niobates such as Li-Ti-niobate (and it’s sodium counterpart) store lithium (sodium) via the conventional intercalation mechanism. Detailed experimental and theoretical investigations reveal interesting and non trivial ion transport, which are found to be strongly correlated to the elect
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