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Dissertations / Theses on the topic 'Ca3Co4O9'

Author: Grafiati

Published: 4 June 2021

Last updated: 15 February 2022

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1

Moubah, Reda. "Structure et magnétisme des couches minces de cobaltite de types Ca3Co2O6 et Ca3Co4O9 déposées par ablation laser pulsée." Strasbourg, 2010. https://publication-theses.unistra.fr/public/theses_doctorat/2010/MOUBAH_Reda_2010.pdf.

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Cette thèse porte sur l'étude des propriétés structurales et magnétiques des couches minces de cobaltite de types Ca3C0206 et Ca3C0409 déposées par ablation laser pulsée sur des substrats d'AI20 3(OOl). Ce travail a d'abord consisté en l'élaboration de couches minces polycristallines de Ca3C0206 et épitaxiées de Ca3C0409. En ce qui concerne la cobaltite Ca3C0206, on a pu déterminer la valeur du gap optique et qui est en accord avec les valeurs obtenues par des études théoriques. Le résultat le plus original est qu'on a démontré que les propriétés magnétiques sont très sensibles à la taille des

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2

Xin, Binbin. "Synthesis of nanoporous Ca3Co4O9 thin films for flexible thermoelectrics." Licentiate thesis, Linköpings universitet, Tunnfilmsfysik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-170837.

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During energy generation, transportation and usage, large amounts of energy are lost as waste heat. With increasing energy consumption and environmental issues, exploiting this waste heat has drawn extensive attention. Thermoelectric energy conversion is an approach to take advantage of the ability of thermoelectric materials to convert waste heat into electricity. The thermoelectric effect was initially studied in the early 19th century with the discovery of the Seebeck effect. Thermoelectric materials and devices can directly convert thermal energy (temperature gradients) into electric energ

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3

Prével, Marlène. "Synthèse et caractérisations de céramiques thermoélectriques Ca3Co4O9 élaborées par frittage forgeage." Caen, 2007. http://www.theses.fr/2007CAEN2030.

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L’oxyde Ca3Co4O9 (Co349) qui possède des propriétés thermoélectriques remarquables a éveillé à sa découverte un grand enthousiasme et est la source de nombreux travaux. Grâce à ses bonnes propriétés thermoélectriques à haute température, il semble être l’un des plus prometteurs pour la conception de modules pour la conversion de chaleur perdue en énergie électrique. L’amélioration des performances de ce matériau passe entre autre par la diminution de la résistivité électrique. La densification et l’introduction d’une orientation cristallographique préférentielle est nécessaire afin de minimise

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Mignardi, Giuliano. "Ca3Co4O9+δ, cathodes innovantes : optimisation de la microstructure et de la composition". Thesis, Lille 1, 2014. http://www.theses.fr/2014LIL10155/document.

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Cette thèse porte sur l’optimisation en termes de microstructure et de composition des propriétés électrochimiques du composé Ca3Co4O9+δ pour une application comme cathode pour Pile à Combustible à Oxyde. En utilisant la sérigraphie comme technique de dépôt, la Résistance Surfacique Spécifique a été diminuée jusqu’à 0.5 Ωcm² à 700°C pour un matériau composé de 50% en masse d’oxyde de cérium dopé au gadolinium et Ca3Co4O9+δ. Par ailleurs, des techniques telles que le spin-coating et l’électro-spray apparaissent comme prometteuse pour l’amélioration des performances. Nous avons tenté d’étudié l’

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5

Kenfaui, Driss. "Étude des propriétés mécaniques et thermoélectriques des matériaux Ca3Co4O9 texturés pour la conversion d'énergie." Phd thesis, Université de Caen, 2010. http://tel.archives-ouvertes.fr/tel-00547858.

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L'oxyde thermoélectrique (TE) Ca3Co4O9 se place avantageusement pour les applications de conversion d'énergie en raison de ses bonnes propriétés TE, ses stabilités chimique et thermique à l'air à haute température et l'absence de biotoxicité. Une étude comparative des apports respectifs de procédés de consolidation (frittage conventionnel-CS, pressage à chaud-HP et frittage flash-SPS) a été menée pour déterminer les conditions expérimentales d'obtention de céramiques Ca3Co4O9 aux caractéristiques TE et fiabilité optimisées pour être intégrées dans des dispositifs TE. Par le procédé HP, les con

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6

Kenfaui, Driss. "Etude des propriétés mécaniques et thermoélectriques des matériaux Ca3Co4O9 texturés pour la conversion d’énergie." Caen, 2010. http://www.theses.fr/2010CAEN2037.

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L’oxyde thermoélectrique (TE) Ca3Co4O9 se place avantageusement pour les applications de conversion d’énergie en raison de ses bonnes propriétés TE, ses stabilités chimique et thermique à l’air à haute température et l’absence de biotoxicité. Une étude comparative des apports respectifs de procédés de consolidation (frittage conventionnel-CS, pressage à chaud-HP et frittage flash-SPS) a été menée pour déterminer les conditions expérimentales d’obtention de céramiques Ca3Co4O9 aux caractéristiques TE et fiabilité optimisées pour être intégrées dans des dispositifs TE. Par le procédé HP, les con

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7

Токарева, Е. С., та E. S. Tokareva. "Получение и функциональные свойства сложнооксидных материалов на основе Ca3Co4O9+δ как перспективных катодов для среднетемпературных ТОТЭ : магистерская диссертация". Master's thesis, б. и, 2021. http://hdl.handle.net/10995/99985.

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Объектами исследования настоящей работы являются катодные материалы на основе сложного оксида Сa3Co4O9+δ. Цель работы – апробация материалов на основе Сa3Co4O9+δ, которые могут быть использованы в качестве катодов для среднетемпературных твердооксидных топливных элементов с протон-проводящими электролитами BaCe0.5Zr0.3Y0.1Yb0.1O3- и BaCe0.7Zr0.1Y0.1Yb0.1O3-. Методом пиролиза цитрат-солевых композиций проведен синтез сложных оксидов Сa3Co4O9+δ, Ca3Co4-xCuxO9 (х = 0.05; 0.1; 0.15; 0.2), BaCe0.5Zr0.3Y0.1Yb0.1O3-δ и BaCe0.7Zr0.1Y0.1Yb0.1O3-. При помощи комплекса современных методов исследования

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8

Thoréton, Vincent. "Propriétés de transport de l'oxygène dans les cobaltites Ba2Co9O14 et Ca3Co4O9+δ  : apport du SIMS et du LEIS". Thesis, Lille 1, 2012. http://www.theses.fr/2012LIL10144/document.

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Ce travail porte principalement sur la caractérisation des propriétés de transport de l'oxygène dans deux cobaltites, Ba2Co9O14 et Ca3Co4O9+δ, matériaux prometteurs comme cathode de pile à combustible à oxyde solide ou anode d’électrolyseur haute-température. Une grosse partie du travail a concerné la mise en place de la mesure de profils de diffusion de l'oxygène par échange isotopique et analyse SIMS. L'étude a ainsi démontré que ces deux matériaux sont des conducteurs mixtes ionique/électronique.Alors que les paramètres de transport mesurés sur Ba2Co9O14sont relativement faibles, les phases

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9

Lin, Keng-Yu. "Thin films for thermoeletric applications." Thesis, Linköpings universitet, Tunnfilmsfysik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-109106.

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Global warming and developments of alternative energy technologies have become important issues nowadays. Subsequently, the concept of energy harvesting is rising because of its ability of transferring waste energy into usable energy. Thermoelectric devices play a role in this field since there is tremendous waste heat existing in our lives, such as heat from engines, generators, stoves, computers, etc. Thermoelectric devices can extract the waste heat and turn them into electricity. Moreover, the reverse thermoelectric phenomenon has the function of cooling which can be applied to refrigerato

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10

Miyazawa, Keiji. "Síntese e caracterização de materiais termoelétricos baseados no sistema CA-Co-O." Master's thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/14309.

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Mestrado em Engenharia Física<br>Os óxidos de metais, como é o caso dos óxidos de cálcio e cobalto, são materiais de elevado interesse tecnológico atendendo às suas propriedades termoelétricas, o que poderá favorecer a sua utilização como conversor de energia térmica em elétrica em aplicações futuras. Parte dos esforços para aperfeiçoar as suas propriedades termoelétricas têm passado pela modificação da composição do material ou, em alternativa, a alteração da microestrutura do material policristalino. Com o objetivo de otimizar as propriedades termoelétricas do óxido de cálcio cobalto (Ca3Co

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11

Fleck, Catherine Louise. "Magnetism in the complex cobaltates Y1−xSrxCoO3−δ (0.7 ≤ x ≤ 0.95) and Ca3Co2O6". Thesis, University of Warwick, 2011. http://wrap.warwick.ac.uk/45164/.

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The magnetic phases in the complex cobaltates Y1−xSrxCoO3−δ (0.7 ≤ x ≤ 0.95) and Ca3Co2O6 have been investigated by susceptibility, heat capacity, X-ray and neutron scattering techniques. These measurements have shown that the super- structure ordering in the perovskite cobaltate Y1−xSrxCoO3−δ which evolves as a function of temperature heavily influences the ferrimagnetic behaviour of this mate- rial. Neutron scattering has also been used to probe the unusual time and magnetic field dependent behaviour of the spin-chain compound Ca3Co2O6, and to further our understanding of the magnetic phase

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12

Kedsongpanya, Sit. "Nanolaminated Thin Films for Thermoelectrics." Thesis, Linköping University, Linköping University, Department of Physics, Chemistry and Biology, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-56699.

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<p>Energy harvesting is an interesting topic for today since we face running out of energy source, a serious problem in the world. Thermoelectric devices are a good candidate. They can convert heat (i.e. temperature gradient) to electricity. This result leads us to use them to harvest waste heat from engines or in power plants to generate electricity. Moreover, thermoelectric devices also perform cooling by applied voltage to device. This process is clean, which means that no greenhouse gases are emitted during the process. However, the converting efficiency of thermoelectrics are very low com

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13

Chen, Jeng-Lung, та 陳政龍. "X-ray Absorption Spectroscopy Study of Ca3Co4O9+δ and Related Materials". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/65746433824310581433.

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碩士<br>淡江大學<br>物理學系碩士班<br>93<br>In order to study the correlation between hole concentration and the thermoelectric property, we have performed x-ray absorption near edge structure (XANES) study of Ca3Co4O9 based thermoelectric materials. In Fe-doped systems, the Fe unoccupied states can be increased by increasing the Fe concentration. On the other hand, O K-edge prepeak shows the electric structure of transition metal 3d-O 2p hybridization increased by increasing Fe concentration. The Co have lessed unoccupied states when Fe-doped equal to 0.05. That compare with thermoelectric data . We find

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14

黃有志. "Preparation and Thermoelectric Properties of co-doped Misfit Layered Ca3Co4O9+δ". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/16911660035767673319.

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碩士<br>國立彰化師範大學<br>物理學系<br>98<br>The misfit layered structure Ca3Co4O9 is composed with two subsystems of [CoO2] and [Ca2CoO3]. This compound has different b parameters of lattice constants between the [Ca2CoO3] block and [CoO2] sheet, so it is made up [Ca2CoO3]q[CoO2], q=bCoO2/bCa2CoO3～0.62. The triple layered rock salt type [Ca2CoO3] blocks can be written [CaO][CoO][CaO] that to serve as electronic transport layers. The CdI2 type [CoO2] sheets store carrier charges and provide electrons to [Ca2CoO3]. The single crystal Ca3Co4O9 exhibits a high thermoelectric power, low electric resistivity, a

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15

林保江. "Preparation and Thermoelectric Properties of Ag and Si doped Misfit Layered Ca3Co4O9." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/46476947981963863921.

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16

Lin, Z. R., and 林志儒. "Preparation and Thermoelectric Properties of Transition Metal doped Misfit Layered Cobaltite Ca3Co4O9." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/16805833187046526956.

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碩士<br>國立彰化師範大學<br>物理學系<br>96<br>Ca3Co4O9 is a misfit layered cobaltites, it is composed with two substructures ([Ca2CoO3] and [CoO2]) . Because the period lengths (b1 and b2) of the two substructures are different, it is made up [Ca2CoO3]bCoO2 , b~0.62. [Ca2CoO3] is a triple layered structure ([CaO][CoO][CaO]). [CoO2] is a layer that to make electron transmission. [Ca2CoO3] is a layer to store up carrier charges, it can provide electrons to [CoO2]. Ca3Co4O9 is a very great thermoelectric material, it has a low electric resistivity, a large thermopower, and a small thermal conductivity. To atte

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17

Yen-ChengTing and 丁彥晟. "Effect of Fe and Ce Co-doping on the Thermoelectric Properties of Ca3Co4O9." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/29885524202707212510.

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碩士<br>國立成功大學<br>材料科學及工程學系碩博士班<br>101<br>Thermoelectric(TE) (Ca2CoO3)(CoO2)Δ(Δ~1.61) materials can be expressed as Ca3Co3.915¬O¬9+δ¬(δ=0.33)，For recent years has become one kind of hot materials for research TE materials.We report the Ca3Co3.915¬O¬9.33 formation factors of solid solution,Seebeck coefficient(thermopower) ,and the conduction mechanism of materials in Ca3Co3.915¬O¬9.33 with in- depth discussion.We obtain valuable results for Ca3Co3.915¬O¬9.33 synthesis method,that the experiment was based on previous practices and to improve the synthesis of a stable and dense phase conditions.For

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18

Kao, Yu-Chih, and 高郁智. "Effect of rare-earth-doping on the electronic structure of Ca3Co4O9 thermoelectric material studied." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/27748585020134413980.

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碩士<br>淡江大學<br>物理學系碩士班<br>98<br>We have performed x-ray absorption near edge structure (XANES) study on rare-earth-doped thermoelectric materials based on Ca3Co4O9. Samples are doped with various rare-earth elements, including Pr, Dy, Ho, Er, Yb and Lu, and the doping level is fixed at 0.1. Co K-edge and Ca L3-edge XANES become weaker in rare-earth doped samples, which indicates the unoccupied state of Ca 3d and Co 4p are decreased compared to the undoped sample. It also indicates that there may have some electrons transferred into Ca 3d and Co 4p states. The ionic radii of rare-earth element d

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19

Jhang, Chuan-Sheng, та 張傳盛. "Preparation and Thermoelectric Properties of Pr, Dy and Ga doped Misfit Layered Ca3Co4O9+δ". Thesis, 2009. http://ndltd.ncl.edu.tw/handle/27544702243008459023.

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碩士<br>國立彰化師範大學<br>光電科技研究所<br>97<br>Ca3Co4O9 is a misfit layered structure, and it is composed with two subslattices of [CoO2] and [Ca2CoO3]. The period lengths of two substructures (b1 and b2) are different. We can observe b1/b2=0.62 by electron microscope. [Ca2CoO3] is a triple layered structure, and also written [CaO][CoO][CaO] that to make electron transmission. [CoO2] is a layer that to store carrier charges, can provide electrons to [Ca2CoO3]. Ca3Co4O9 single crystal shows good thermopower, low electric resistivity, and low thermal conductivity. So, it is considered as a promising thermoe

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20

Chen, Chu-Ciou, та 陳楚遒. "The electronic structure of Pr and Yb doped Ca3Co4O9+δ studied by x-ray absorption spectroscopy". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/47792287226879220732.

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碩士<br>淡江大學<br>物理學系碩士班<br>98<br>We have performed x-ray absorption spectroscopy (XAS) study on the electronic structure of Pr and Yb doped Ca3Co4O9+δ. In Pr-doped samples, the variation of the intensities of Co K-edge and Ca L3-edge spectra indicate that the Co 4p and Ca 3d unoccupied state decreased by Pr doping. From Co L3-edge and O K-edge spectra we observe that the Co 3d and Co 3d-O2p unoccupied state were increased by Pr doping. The electronic transferred from O 2p to Ca 3d state and electronic transferred from Co 3d-O2p hybridization state to Co 4p state are possible. In Yb-doped samples

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