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Добірка наукової літератури з теми "POTASSIUM SODIUM NIOBATE ( KNN )"

Автор: Grafiati

Опубліковано: 21 жовтня 2023

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Дисертації з теми "POTASSIUM SODIUM NIOBATE ( KNN )"

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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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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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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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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<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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