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Teses / dissertações sobre o tema "Antiferroelectric materials"

Autor: Grafiati
Publicado: 7 de dezembro de 2024

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1

Yu, Yongjian. "FIELD INDUCED ANTIFERROELECTRIC PHASE SWITICHING BEHAVIOR IN LEAD STRONTIUM ZIRCONATE TITANATE CERAMICS." University of Cincinnati / OhioLINK, 2000. http://rave.ohiolink.edu/etdc/view?acc_num=ucin971277493.

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2

JEEVANANTHAM, MUTHUKUMARAN. "GRAIN SIZE, TEMPERATURE AND FATIGUE EFFECTS OF FIELD-INDUCED ANTIFERROELECTRIC-FERROELECTRIC PHASE SWITCHING BEHAVIOR IN STRONTIUM ZIRCONATE TITANATE CERAMICS." University of Cincinnati / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ucin990814497.

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3

Herath, Mudiyanselage Dimuthu Prasad Wijethunge. "Theoretical investigation of ferroelectric properties in 2D materials and their applications." Thesis, Queensland University of Technology, 2022. https://eprints.qut.edu.au/235394/1/Dimuthu%2BWijethunge%2BThesis%283%29.pdf.

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This thesis examined two-dimensional ferroelectric materials and their applications using density functional theory calculations. The research has revealed several novel applications for 2D ferroelectric materials. It illustrated that ferroelectric materials can be used to modify electronic, photocatalytic and magnetic properties of two-dimensional materials. In addition to exploring applications, new two-dimensional ferroelectric material which exhibits metallic properties was discovered through high through output search. Two-dimensional ferroelectric metals are extremely rare and only handf
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4

Arbouz, Hamida. "Étude des modes de vibration de basses fréquences du phosphate diacide d'ammonium et du phosphate diacide de potassium deutéré." Nancy 1, 1986. http://www.theses.fr/1986NAN10024.

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Mesures entre 7 et 300K, dans le domaine 15-400 CM**(-)1 et réalisation des spectres du cristal d'ADP, dans la phase anti-ferroélectrique, en lumière polarisée. Détermination des paramètres des modes de vibration par ajustement au moyen d'un modèle de la fonction diélectrique. Mise en évidence de l'importance des modes de basse fréquence, liés aux mouvements collectifs des protons, dans le mécanisme de la transition de phase
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5

Garcia, Ramirez Emmanuel Armando. "Etude et optimisation de matériaux diélectriques et électrodes déposés par ALD pour structures nano-poreuses." Electronic Thesis or Diss., Normandie, 2024. http://www.theses.fr/2024NORMC226.

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Cette thèse examine les films minces d’oxyde de hafnium (HfO2) pour leur potentiel dans lesnanocondensateurs, répondant aux besoins en miniaturisation et haute performance del’électronique moderne. Le HfO2 est compatible avec la Déposition par Couches Atomiques(ALD), ce qui permet des dépôts minces précis et homogènes, essentiels pour garantir la fiabilitédes dispositifs électroniques. Les films minces sont soumis à différentes techniques de fabricationet de caractérisation pour analyser leur morphologie et leurs propriétés électriques, notamment laconstante diélectrique, la tension de claquag
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6

Pedreira, Aline Moojen. "Estudo estrutural e eletro-óptico da fase B2 de materiais com moléculas de banana." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-20102006-121009/.

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Com base em resultados de DSC, análise estrutural por difração de raios X e observações de textura, analisamos os efeitos da mistura do solvente apolar hexadecano com cristais líquidos formados pelas moléculas banana 1,3-fenilenobis[4-(4-tetradecilfeniliminometil)benzoato] (MB14) e 4-cloro-1,3-fenilenobis[4-(4-tetradecilfeniliminometil) benzoato] (MB14Cl). Propusemos um modelo estrutural para explicar as modificações causadas no arranjo molecular da fase B2 pelo acréscimo gradual do solvente. Observamos a diminuição da temperatura de transição entre esta fase e a fase isotrópica, porém a tran
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7

Liu, Zhen. "Energy Storage and Conversion investigations in ferroelectric / antiferroelectric materials." Phd thesis, 2021. http://hdl.handle.net/1885/250954.

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With the ever-increasing global demand for new energy and modern technology, the investigations in advanced ferroelectrics (FE) and antiferroelectric (AFE) ceramics is getting more and more urgent. The phase structure and phase transition behaviors of FE and AFE materials can be influenced by various external stimuli, such as temperature and pressure, and thus offer great possibilities for different applications. With this bearing in mind, several energy related effects in FE/AFE materials are studied in this thesis, including the pyroelectric effect, the explosive energy conversion effect, an
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8

Lu, Teng. "Structure and Property Evolution Induced by the Phase Transitions in Several Antiferroelectric Materials." Phd thesis, 2017. http://hdl.handle.net/1885/144426.

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Antiferroelectric (AFE) materials are an important group of functional materials showing unique properties such as double polarization-electric field (P-E) hysteresis loop, and charge release under the pressure and temperature. These performances are strongly connected to the structural phase transitions induced by external conditions. Many investigations were carried out to optimize their properties but the structure-property relationship of such AFE materials still remain unclear. With this bearing in mind, in this thesis, I firstly investigate the
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9

Parui, Jayanta. "Studies On Pure And Modified Antiferroelectric PbZrO3 Thin Films." Thesis, 2009. https://etd.iisc.ac.in/handle/2005/663.

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Metal oxides crystallized in perovskite structure are generally modified in two different ways. According to the general structural formula ABO3, the two ways are A-site modification and B-site modification. The primary significance of perovskite metal oxides rests on their importance in electronic devices. A particular class of perovskites, namely Lead Zirconate or modified Lead Zirconate has received a special attention because of their unique antiferroelectricity and various applications in devices. Among the other modifications, A-site modification of PbZrO3 by La is rare and not much expl
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10

Parui, Jayanta. "Studies On Pure And Modified Antiferroelectric PbZrO3 Thin Films." Thesis, 2009. http://hdl.handle.net/2005/663.

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Metal oxides crystallized in perovskite structure are generally modified in two different ways. According to the general structural formula ABO3, the two ways are A-site modification and B-site modification. The primary significance of perovskite metal oxides rests on their importance in electronic devices. A particular class of perovskites, namely Lead Zirconate or modified Lead Zirconate has received a special attention because of their unique antiferroelectricity and various applications in devices. Among the other modifications, A-site modification of PbZrO3 by La is rare and not much expl
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11

Chen, Fu-Dong, and 陳富東. "Study on the Novel Antiferroelectric Liquid Crystals Derived from Chiral Swallow-Tailed Materials with Amide Linkage." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/56404202127223166671.

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碩士<br>大同大學<br>化學工程研究所<br>90<br>Abstract The purpose of this research work was an attempt to elucidate the structure-property correlation in the chiral amide smectic liquid crystals, because the exciting results have been obtained this field of chiral system　in our laboratory. Therefore, two series of chiral materials DPmPBNPA(m=9~13) and DEmPBNPA(m=10~15) were designed for the synthesis and investigation of the stricture-property relationship in the chiral amide liquid crystal system. The target compounds was modified independently by the length of the alkyl chain length (m) a
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12

Yu, Mei-Ching, and 余玫靜. "Design and Synthesis of New Chiral Groups for the Development of Ferroelectric and Antiferroelectric Liquid Crystal Materials." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/qtkzts.

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博士<br>大同大學<br>化學工程學系(所)<br>95<br>The primary of this research work was an attempt to elucidate the correlation between structure and property in the chiral smectic liquid crystals. Thus, two new chiral moieties, (S)-2-(metylsulfanyl)ethyl 2-hydroxypropanoate prepared by reacting (S)-lactic acid with 2-methylsulfanyl-1-ethanol, and (S)-[1-methyl-2-(2’-methylsulfanylethoxy)]ethanol prepared by reacting (S)-propylene oxide with 2-methylsulfanyl-1-ethanol under basic condition, were designed and synthesized, and three series of chiral liquid crystal compounds were subsequently prepared for the mes
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13

Chiang, Chi-Tsung, and 蔣其宗. "Synthesis and Characterization of Achiral Swallow-tailed Materials with " Antiferroelectric-like" Structure and the Electro-optical Properties in Binary Mixtures." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/28560056951863715842.

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碩士<br>大同大學<br>化學工程研究所<br>88<br>Two series of achiral swallow-tailed materials; 2-propylpentyl 4-(4'-alkyloxybiphenyl-4-carbonyloxy) benzoates, PPmBCB(m=8~12), and 2-ethylbutyl 4-(4'-alkyloxybiphenyl-4-carbonyloxy)benzoates, EBmBCB (m=8~12) were designed and synthesized for the investigation of the structure-property relationship of the mesophases. The results obtained from the study of these two series achiral swallow-tailed materials (PPmBCB and EBmBCB) showed that all materials have enantiotropic SA and Scalt phases. The Scalt phase was confirmed by the first order characterizatio
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14

Lin, Cho-Ying, and 林卓瑩. "Design and Synthesis of New Non-fluorinated and Fluorinated Chiral Alcohols for the Development of Ferroelectric and Antiferroelectric Liquid Crystal Materials." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/2z8rhf.

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博士<br>大同大學<br>化學工程學系(所)<br>95<br>ABSTRACT AFLCD display with such good characteristics as: wide screen, high resolution, excellent image quality and full color have been developed. However, so far, display manufacturers have been unable to commercialize AFLC display devices despite continuous efforts. It seems that the appearance of the SmCA* phase and structure-property relationship of AFLC materials are still understood well enough to optimize the material parameters. Thus, in order to ascertain the structure-property correlations and the practical application in electro-optical services, in
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15

Chang, Pin-Lin, and 張濱麟. "THE EFFECT OF THE PERIPHERAL CHAIN LENGTH AND THE SWALLOW-TAILED STRUCTURE OF THE CHIRAL MATERIALS ON THE FORMATION OF THRESHOLDLESS ANTIFERROELECTRIC PHASE." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/58122815479098393110.

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碩士<br>大同工學院<br>化學工程研究所<br>87<br>The purpose of this research work was an attempt to elucidate the structure-property correlation in the chiral smectic liquid crystals, because the exciting results have been obtained this field of chiral system. A homologous series of chiral materials HNP(p,n,2) was designed for the synthesis and investigation of the structure-property relationship in the chiral liquid crystal system. The target compounds was modified independently by the length of the alkyl chain p and n methylene group for the study. Compounds HNP(p,0,2; p=8~14) have the Iso-N*-TGB
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