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Auswahl der wissenschaftlichen Literatur zum Thema „RUDDLESDEN-POPPER STRUCTURE“
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Zeitschriftenartikel zum Thema "RUDDLESDEN-POPPER STRUCTURE"
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Tian, Jiyu, Eli Zysman-Colman und Finlay D. Morrison. „Azetidinium Lead Halide Ruddlesden–Popper Phases“. Molecules 26, Nr. 21 (27.10.2021): 6474. http://dx.doi.org/10.3390/molecules26216474.
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A family of Ruddlesden–Popper (n = 1) layered perovskite-related phases, Az2PbClxBr4−x with composition 0 ≤ x ≤ 4 were obtained using mechanosynthesis. These compounds are isostructural with K2NiF4 and therefore adopt the idealised n = 1 Ruddlesden–Popper structure. A linear variation in unit cell volume as a function of anion average radius is observed. A tunable bandgap is achieved, ranging from 2.81 to 3.43 eV, and the bandgap varies in a second-order polynomial relationship with the halide composition.
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Urushihara, Daisuke, Kenta Nakajima, Ariki Nakamura, Koichiro Fukuda, Hodaka Sugai, Shinya Konishi, Katsuhisa Tanaka und Toru Asaka. „Unique octahedral rotation pattern in the oxygen-deficient Ruddlesden–Popper compound Gd3Ba2Fe4O12“. Acta Crystallographica Section C Structural Chemistry 77, Nr. 6 (26.05.2021): 286–90. http://dx.doi.org/10.1107/s2053229621005258.
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A novel Ruddlesden–Popper-related compound, Gd3Ba2Fe4O12, was discovered and its crystal structure was determined via single-crystal X-ray diffraction. The structure has an ordered structure of octahedra and pyramids along the c axis. Gd3Ba2Fe4O12 belongs to the tetragonal system P42/ncm, with a = 5.59040 (10) Å and c = 35.1899 (10) Å. The A-site ions in the Ruddlesden–Popper structure, i.e. Gd3+ and Ba2+, exhibit an ordering along the c axis. The perfect oxygen deficiency is accommodated at the GdO layers in the proper Ruddlesden–Popper structure. Using the bond-valence-sum method, the Fe ions in the FeO6 octahedra and FeO5 pyramids represent valence states of +3 and +2.5, respectively, demonstrating a two-dimensional charge disproportionation. The corner-sharing FeO6 octahedra and FeO5 pyramids are tilted in opposite directions, with the neighbours around one axis of the simple perovskite configuration, which, using Glazer's notation, can be represented as a − b 0 c 0/b 0 a − c 0. In the perovskite blocks, the facing FeO5 pyramids across the Gd layer rotate in the same sense, which is a unique rotation feature related to oxygen deficiency.
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Song, Jia, De Ning, Bernard Boukamp, Jean-Marc Bassat und Henny J. M. Bouwmeester. „Structure, electrical conductivity and oxygen transport properties of Ruddlesden–Popper phases Lnn+1NinO3n+1 (Ln = La, Pr and Nd; n = 1, 2 and 3)“. Journal of Materials Chemistry A 8, Nr. 42 (2020): 22206–21. http://dx.doi.org/10.1039/d0ta06731h.
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4
Gareeva, Zukhra, Anatoly Zvezdin, Konstantin Zvezdin und Xiangming Chen. „Symmetry Analysis of Magnetoelectric Effects in Perovskite-Based Multiferroics“. Materials 15, Nr. 2 (13.01.2022): 574. http://dx.doi.org/10.3390/ma15020574.
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In this article, we performed symmetry analysis of perovskite-based multiferroics: bismuth ferrite (BiFeO3)-like, orthochromites (RCrO3), and Ruddlesden–Popper perovskites (Ca3Mn2O7-like), being the typical representatives of multiferroics of the trigonal, orthorhombic, and tetragonal crystal families, and we explored the effect of crystallographic distortions on magnetoelectric properties. We determined the principal order parameters for each of the considered structures and obtained their invariant combinations consistent with the particular symmetry. This approach allowed us to analyze the features of the magnetoelectric effect observed during structural phase transitions in BixR1−xFeO3 compounds and to show that the rare-earth sublattice has an impact on the linear magnetoelectric effect allowed by the symmetry of the new structure. It was shown that the magnetoelectric properties of orthochromites are attributed to the couplings between the magnetic and electric dipole moments arising near Cr3+ ions due to distortions linked with rotations and deformations of the CrO6 octahedra. For the first time, such a symmetry consideration was implemented in the analysis of the Ruddlesden–Popper structures, which demonstrates the possibility of realizing the magnetoelectric effect in the Ruddlesden–Popper phases containing magnetically active cations, and allows the estimation of the conditions required for its optimization.
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Tomkiewicz, Alex C., Mazin Tamimi, Ashfia Huq und Steven McIntosh. „Oxygen transport pathways in Ruddlesden–Popper structured oxides revealed via in situ neutron diffraction“. Journal of Materials Chemistry A 3, Nr. 43 (2015): 21864–74. http://dx.doi.org/10.1039/c5ta04193g.
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In situ neutron diffraction techniques were utilized to provide detailed information about the crystal structure of n = 1, n = 2, and n = 3 Ruddlesden–Popper structures focusing on the oxygen transport pathways created by localization of oxygen vacancies.
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HAUCK, J., und K. MIKA. „STRUCTURAL RELATION BETWEEN SUPERCONDUCTING OXIDES, AURIVILLIUS PHASES ANDRUDDLESDEN-POPPER PHASES“. International Journal of Modern Physics B 07, Nr. 19 (30.08.1993): 3423–33. http://dx.doi.org/10.1142/s0217979293003309.
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The Ruddlesden-Popper phases can be described as a stacking of v or v′ CaTiO 3 and w or w′ MO structural units with bcc M lattice and O at octahedral interstices. 50% of all octahedral interstices in the bcc M lattice are occupied in CaTiO 3, 33% in MO. The Aurivillius phases can be derived as complementary structures with an occupation of the 67% vacant sites of MO leading to MO 2 units similar to the CaF 2 structure. 14 different structures are obtained as combinations of up to 8 v and w units. The structures can also be described by the sequence of coordination numbers of metal atoms with respect to oxygen. The superconducting phases known so far are with different donor elements: e + for Ruddlesden-Popper phases and e – for Aurivillius phases.
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Yang, Chao, Yi Wang, Daniel Putzky, Wilfried Sigle, Hongguang Wang, Roberto A. Ortiz, Gennady Logvenov, Eva Benckiser, Bernhard Keimer und Peter A. van Aken. „Ruddlesden–Popper Faults in NdNiO3 Thin Films“. Symmetry 14, Nr. 3 (25.02.2022): 464. http://dx.doi.org/10.3390/sym14030464.
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The NdNiO3 (NNO) system has attracted a considerable amount of attention owing to the discovery of superconductivity in Nd0.8Sr0.2NiO2. In rare-earth nickelates, Ruddlesden–Popper (RP) faults play a significant role in functional properties, motivating our exploration of its microstructural characteristics and the electronic structure. Here, we employed aberration-corrected scanning transmission electron microscopy and spectroscopy to study a NdNiO3 film grown by layer-by-layer molecular beam epitaxy (MBE). We found RP faults with multiple configurations in high-angle annular dark-field images. Elemental intermixing occurs at the SrTiO3–NdNiO3 interface and in the RP fault regions. Quantitative analysis of the variation in lattice constants indicates that large strains exist around the substrate–film interface. We demonstrate that the Ni valence change around RP faults is related to a strain and structure variation. This work provides insights into the microstructure and electronic-structure modifications around RP faults in nickelates.
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Barone, Matthew R., Myoungho Jeong, Nicholas Parker, Jiaxin Sun, Dmitri A. Tenne, Kiyoung Lee und Darrell G. Schlom. „Synthesis of metastable Ruddlesden–Popper titanates, (ATiO3)nAO, with n ≥ 20 by molecular-beam epitaxy“. APL Materials 10, Nr. 9 (01.09.2022): 091106. http://dx.doi.org/10.1063/5.0101202.
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We outline a method to synthesize ( ATiO3) n AO Ruddlesden–Popper phases with high- n, where the A-site is a mixture of barium and strontium, by molecular-beam epitaxy. The precision and consistency of the method described is demonstrated by the growth of an unprecedented (SrTiO3)50SrO epitaxial film. We proceed to investigate barium incorporation into the Ruddlesden–Popper structure, which is limited to a few percent in bulk, and we find that the amount of barium that can be incorporated depends on both the substrate temperature and the strain state of the film. At the optimal growth temperature, we demonstrate that as much as 33% barium can homogeneously populate the A-site when films are grown on SrTiO3 (001) substrates, whereas up to 60% barium can be accommodated in films grown on TbScO3 (110) substrates, which we attribute to the difference in strain. This detailed synthetic study of high n, metastable Ruddlesden–Popper phases is pertinent to a variety of fields from quantum materials to tunable dielectrics.
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Putri, Yulia Eka, Hamsal Yusri, Hamsal Yusri, Zulhadjri und Zulhadjri. „STUDI HANTARAN LISTRIK SENYAWA SRN+1TINO3N+1 (N = 1 DAN 2) FASA RUDDLESDEN-POPPER YANG DISINTESIS DENGAN METODE LELEHAN GARAM“. Jurnal Riset Kimia 8, Nr. 2 (19.03.2015): 176. http://dx.doi.org/10.25077/jrk.v8i2.237.
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Srn+1TinO3n+1 (n = 1, 2,...n)Ruddlesden-Popper phase is a metal oxide compound with a layered structure consisting of SrTiO3 perovskite layers and strontium oxide (SrO) layers, thus this material has a potential as termoeletrik compounds that could be developed as an alternative material for renewable energy. In this study, we examine one of the 3 parameters of termoelectric properties, namely the electrical conductivity. Srn+1TinO3n+1 (n = 1 and 2)Ruddlesden-Popper phases were synthesized using molten salt method. The synthesis was carried out at 950 °C for 10 hours with a ratio of precursor and salt were 1: 0.5. Structural analysis by X-Ray Diffractometer (XRD) confirmed that all synthesized compounds formed Srn+1TinO3n+1 (n = 1, and 2) Ruddlesden-Popper phase with the characteristic peaks at 2q = 31o, 32o, and 46o. The morphology analysis by Scanning Electron Microscope (SEM) showed that the particles have plate-shaped with crystallites size were 20 nm. The electrical properties were measured using LCR meter with the highest electrical conductivity of 2.25x10-7 S / cm which showed the semiconductors behaviour.
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Arabpour Roghabadi, Farzaneh, Maryam Alidaei, Seyede Maryam Mousavi, Tahereh Ashjari, Ali Shokrolahzadeh Tehrani, Vahid Ahmadi und Seyed Mojtaba Sadrameli. „Stability progress of perovskite solar cells dependent on the crystalline structure: From 3D ABX3 to 2D Ruddlesden–Popper perovskite absorbers“. Journal of Materials Chemistry A 7, Nr. 11 (2019): 5898–933. http://dx.doi.org/10.1039/c8ta10444a.
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This review presents the progress of the change of the PSK structure from 3 dimensional CH3NH3PbX3 to mixed cations or halides based PSKs and finally to Ruddlesden–Popper PSK two dimensional (2D) homologous structures regarding the lifetime improvement.
Dissertationen zum Thema "RUDDLESDEN-POPPER STRUCTURE"
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Lacotte, Morgane. „Etude de films minces de structure type Ruddlesden-Popper par épitaxie combinatoire“. Caen, 2015. http://www.theses.fr/2015CAEN2039.
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Les films minces d’oxydes de métaux de transition font l’objet de nombreuses études, en raison de leurs applications potentielles variées. Néanmoins, nombre de ces recherches ont été entreprises avec des substrats monocristallins classiques, d’orientations typiques (100), (001) ou encore (110), représentant une fraction infime de l’espace des orientations. Nous avons donc développé une approche innovante, appelée « épitaxie combinatoire », pour laquelle chaque film est déposé à la surface d’un substrat céramique polycristallin poli. Chaque grain peut ainsi être considéré comme un monocristal d’orientation particulière, donnant une infinité d’orientations à la surface d’un même échantillon. Ce travail de thèse présente l’étude de matériaux appartenant au premier terme de la série de Ruddlesden-Popper, de formule générale A2BO4, et présentant une structure dérivée de la pérovskite. La synthèse de substrats de Sr2TiO4, l’optimisation du dépôt de films minces de Ca2MnO4 et de Nd2NiO4 par ablation laser pulsé, et la caractérisation des relations d’orientation (ORs) film-substrat sont détaillées. En plus d’une croissance grain sur grain des films sur les substrats, deux ORs majeures sont mises en évidence. L’épaisseur du film, sa composition, mais aussi la contrainte induite par le substrat présentent une influence sur ces ORs, et donc sur la texture des films, ce qui peut être expliqué par des considérations cinétiques et thermodynamiques. Ce travail démontre donc le potentiel de l’épitaxie combinatoire, à savoir la compréhension et la prédiction du comportement de films minces d’oxydes complexes déposés sur des substrats isostructurauxTransition metal oxide thin films have been widely studied, because of their various potential applications. However, numerous investigations have been performed using classical monocrystalline substrates of typical orientations (100), (001) or (110), representing a limited fraction of orientation space. We have been developing a novel approach, called “Combinatorial Substrate Epitaxy”, for which each film is deposited at the polished surface of a polycrystalline ceramic substrate. From this point of view, each grain can be considered as a single crystal of a particular orientation, giving an infinite number of orientations at the surface of a single sample. This work presents the study of materials belonging to the first term of the Ruddlesden-Popper series, of the general formula A2BO4 and derived from the perovskite structure. The synthesis of Sr2TiO4 substrates, the optimization of the pulsed laser deposition of Ca2MnO4 and Nd2NiO4 thin films, and the characterization of film-substrate orientation relationships (ORs) are detailed. In addition to a grain-over-grain growth of the films on substrates, two main ORs are highlighted. The film thickness and composition as well as the substrate-induced strains influence these ORs and thus the film texture, which can be explained considering kinetic and thermodynamic factors. This work finally demonstrates the potential of Combinatorial Substrate Epitaxy, which will be useful for the comprehension and help to the prediction of the behavior of complex oxide films deposited on isostructural substrates
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Sharits, Andrew R. „Structure-Property Relationships in Noncentrosymmetric Layered Perovskites“. The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1480524956906735.
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Velázquez, Matias. „Croissance cristalline, magnétisme critique et magnétorésistance colossale des manganites à structure Ruddlesden-Popper La1. 2(Sr, Ca)1. 8Mn2O7“. Paris 11, 2001. https://tel.archives-ouvertes.fr/tel-00626433.
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Les composés lamellaires à structure Ruddlesden-Popper, de formule (La,Sr,Ca)_3Mn_2O_7, offrent la possibilité d'explorer le magnétisme bidimensionnel (2D) dans la famille des manganites. L'intérêt de ces derniers réside d'une part, dans leur magnétorésistance colossale, d'autre part, dans la polarisation totale en spin de l'état ferromagnétique. Afin d'accéder aux caractères intrinsèque et anisotrope de leurs propriétés physiques, des monocristaux de composition chimique La_1. 2(Sr, Ca)_1. 8Mn_2O_7 et de taille centimétrique ont été fabriqués par fusion de zone verticale associée au four à image. Ils ont ensuite fait l'objet de caractérisations par diffraction des rayons X et des neutrons, et par microscopie électronique en transmission haute résolution. Nous avons approfondi l'étude du comportement magnétique de La_1. 2Sr_1. 8Mn_2O_7 sur une large gamme de température, incluant la détermination de ses grandeurs magnétiques fondamentales: anisotropie magnétique, exposants critiques et "crossovers" au voisinage de la température de Curie, T_c 1̃08K. Au moyen de mesures fines d'aimantation et de susceptibilité, nous avons démontré l'apparition de corrélations quasi-2D vers 4̃20K, température à laquelle le modèle de Curie-Weiss tombe en désuétude. La_1. 2Sr_1. 8Mn_2O_7 peut être considéré comme un aimant de type Heisenberg quasi-2D avec des écarts notoires au modèle idéal: d'une part, l'anisotropie XY induisant un "crossover" avec la dimensionalité de spin à T_n1̃57K, d'autre part, les couplages tridimensionnels entre feuillets double pérovskite qui provoquent un second "crossover" avec la dimensionalité du réseau à T_d1̃17K. Le développement timide des corrélations ferromagnétiques 2D, ainsi que nos estimations des exposants critiques delta=(4. 3±1. 1) et gamma1̃. 4 au voisinage de T_c, indiquent que la transition ferromagnétique dans La_1. 2Sr_1. 8Mn_2O_7 est essentiellement tridimensionnelle. A la transition paramagnétique -> ferromagnétique sont étroitement associés une transition isolant -> métal (T_(i-m)1̃28K), ainsi qu'un maximum de magnétorésistance négative (dp/p(8T))_[001]1̃1502̃x(dp/p(8T))_[110] pour La_1. 2Sr_1. 8Mn_2O_7, supérieur aux performances des pérovskites aux T_c similaires. Avec l'anisotropie marquée de la résistivité électrique et une faible métallicité ne s'établissant véritablement que dans les blocs de feuillets double pérovskite transparaÎt la structure lamellaire des composés La_1. 2Sr_(1. 8-y)Ca_yMn_2O_7 (y=0. 0 et 0. 2)Ruddlesden-Popper layered compounds, of formula (La,Sr,Ca)_3Mn_2O_7, offer the opportunity to explore bidimensional magnetism in the manganites family. In order to acceed to the intrinsic and anisotropic characters of their physical properties, high-quality centimeter size single crystals of La_1. 2(Sr, Ca)_1. 8Mn_2O_7 were successfully grown using a floating zone method associated with an image furnace. The samples were characterized by X-ray and neutron diffraction and high-resolution transmission electron microscopy, verifying the chemistry, the crystallography and the absence of a second phase over several centimeters. A thorough investigation of the magnetic behaviour of these compounds was performed in a wide range of temperatures, including the determination of the fundamental characteristics of a magnetic system: magnetic anisotropy, critical exponents and crossovers in the vicinity of the Curie temperature, T_c1̃08K. By accurate measurements of magnetic susceptibility and magnetization on single crystals, specially designed to lessen the demagnetizing field, we could demonstrate that two-dimensional (2D) correlations start introducing deviations from the Curie-Weiss behaviour below 4̃20K. La_1. 2Sr_1. 8Mn_2O_7 can be viewed as a quasi-two-dimensional Heisenberg ferromagnet with notable deviations from this ideal model: firstly, the XY anisotropy inducing a spin dimensionality crossover at T_s4̃57K, secondly, the three-dimensional couplings between perovskite bilayer blocks, which drive a lattice crossover at T1̃17K. The slow development of the two-dimensional ferromagnetic correlations above T_c, and our quantitative measurements (critical exponents delta=(4. 3±1. 1) and gamma1̃. 4 in the vicinity of T_c), lead us to believe that the ferromagnetic transition in La_1. 2Sr_1. 8Mn_2O_7 is essentially of three-dimensional nature. Intrically related with ferromagnetism are an insulator-metal transition at T_(i-m)1̃28K, and a negative magnetoresistance maximum effect (dp/p(8T))_[001]1̃1502̃x(dp/p(8T))_[110] for La_1. 2Sr_1. 8Mn_2O_7, somewhat superior to the performances of the perovskites with similar T_c's. The poor metallicity becomes indeed only established within the double perovskite slabs, consistently with spin correlations stronger in the (a,b)-plane than along the c -direction
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Velázquez, Matias. „Croissance cristalline, magnétisme critique et magnétorésistance colossale dans les manganites à structure Ruddlesden-Popper La1.2(Sr, Ca)1.8Mn2O7“. Phd thesis, Université Paris Sud - Paris XI, 2001. http://tel.archives-ouvertes.fr/tel-00626433.
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Les composés lamellaires à structure Ruddlesden-Popper, de formule (La,Sr,Ca)_3Mn_2O_7, offrent la possibilité d'explorer le magnétisme bidimensionnel (2D) dans la famille des manganites. L'intérêt de ces derniers réside d'une part, dans leur magnétorésistance colossale, d'autre part, dans la polarisation totale en spin de l'état ferromagnétique. Afin d'accéder aux caractères intrinsèque et anisotrope de leurs propriétés physiques, des monocristaux de composition chimique La_1.2(Sr, Ca)_1.8Mn_2O_7 et de taille centimétrique ont été fabriqués par fusion de zone verticale associée au four à image. Ils ont ensuite fait l'objet de caractérisations par diffraction des rayons X et des neutrons, et par microscopie électronique en transmission haute résolution. Nous avons approfondi l'étude du comportement magnétique de La_1.2Sr_1.8Mn_2O_7 sur une large gamme de température, incluant la détermination de ses grandeurs magnétiques fondamentales: anisotropie magnétique, exposants critiques et "crossovers" au voisinage de la température de Curie, T_c 1̃08K. Au moyen de mesures fines d'aimantation et de susceptibilité, nous avons démontré l'apparition de corrélations quasi-2D vers 4̃20K, température à laquelle le modèle de Curie-Weiss tombe en désuétude. La_1.2Sr_1.8Mn_2O_7 peut être considéré comme un aimant de type Heisenberg quasi-2D avec des écarts notoires au modèle idéal: d'une part, l'anisotropie XY induisant un "crossover" avec la dimensionalité de spin à T_n1̃57K, d'autre part, les couplages tridimensionnels entre feuillets double pérovskite qui provoquent un second "crossover" avec la dimensionalité du réseau à T_d1̃17K. Le développement timide des corrélations ferromagnétiques 2D, ainsi que nos estimations des exposants critiques delta=(4.3±1.1) et gamma1̃.4 au voisinage de T_c, indiquent que la transition ferromagnétique dans La_1.2Sr_1.8Mn_2O_7 est essentiellement tridimensionnelle. A la transition paramagnétique -> ferromagnétique sont étroitement associés une transition isolant -> métal (T_(i-m)1̃28K), ainsi qu'un maximum de magnétorésistance négative (dp/p(8T))_[001]1̃1502̃x(dp/p(8T))_[110] pour La_1.2Sr_1.8Mn_2O_7, supérieur aux performances des pérovskites aux T_c similaires. Avec l'anisotropie marquée de la résistivité électrique et une faible métallicité ne s'établissant véritablement que dans les blocs de feuillets double pérovskite transparaÎt la structure lamellaire des composés La_1.2Sr_(1.8-y)Ca_yMn_2O_7 (y=0.0 et 0.2).
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Neiner, Doinita. „New Ruddlesden-Popper perovskites obtained by topochemical methods“. ScholarWorks@UNO, 2005. http://louisdl.louislibraries.org/u?/NOD,280.
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Thesis (Ph. D.)--University of New Orleans, 2005.Title from electronic submission form. "A dissertation ... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Chemistry"--Dissertation t.p. Vita. Includes bibliographical references.
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DHANABALAN, BALAJI. „Developing Metal-Halide Layered Perovskite Nanomaterials for Optoelectronics“. Doctoral thesis, Università degli studi di Genova, 2021. http://hdl.handle.net/11567/1041905.
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The abundant chemical tunability along with outstanding optoelectronic properties of the 2D metal-halide layered perovskite materials, as well as the potential prospect on understanding the structure-property relationships at the molecular level, provide enormous opportunity for the scientific community on designing new and efficient 2D metal-halide layered perovskites for a specific optoelectronic application. These materials still require attention on understanding their fundamental electronic properties and on controlling their synthesis parameters to produce high quality materials. Moreover, the synergy between the organic and inorganic compounds in these systems further opens up the possibility to unlock novel optoelectronic properties by simply integrating many other available functional organic molecules into these structures. This thesis is dedicated to the synthesis of 2D lead-bromide Ruddlesden Popper layered perovskite materials through a simple synthesis technique and by using different organic molecules. It targets a full investigation of the photo-physical properties of the as synthesized materials. Moreover, it presents detailed studies on the effect of structural rigidity and electron-phonon interaction provided by organic molecules on the emission efficiencies of 2D layered perovskites, and their emission tunability by using organic molecules with different architectures. In a more technological view, this thesis summarizes the work performed on the integration of 2D layered perovskites in polymer films and their emission enhancement by mechanical stress.
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Максимчук, Т. Ю., und T. Yu Maksimchuk. „Кристаллическая структура и физико-химические свойства сложнооксидных фаз Nd1.6Ca0.4Ni1-yCuyO4+δ : магистерская диссертация“. Master's thesis, б. и, 2021. http://hdl.handle.net/10995/99984.
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Работа содержит 71 страницу, 52 рисунка, 8 таблиц, 73 наименования в списке литературы. Ключевые слова: ТВЕРДООКСИДНЫЙ ТОПЛИВНЫЙ ЭЛЕМЕНТ, КАТОДНЫЙ МАТЕРИАЛ, СТРУКТУРА РАДДЛЕСДЕНА-ПОППЕРА, ТЕРМИЧЕСКОЕ РАСШИРЕНИЕ, ЭЛЕКТРОПРОВОДНОСТЬ, ХИМИЧЕСКАЯ СОВМЕСТИМОСТЬ. Методом пиролиза глицерин-нитратных композиций проведен синтез сложных оксидов Nd1.6Ca0.4Ni1-yCuyO4+δ (y = 0.0-0.4). Методом рентгеновской дифракции определен фазовый состав порошков Nd1.6Ca0.4Ni1 yCuyO4+δ (y = 0.0-0.4) (ДРОН-6). Методом Ритвелда при использовании программного пакета FullProf Suite уточнены кристаллоструктурные параметры Nd1.6Ca0.4Ni1-yCuyO4+δ (y = 0.0-0.3) при 25 С. Проведены высокотемпературные рентгеновские исследования порошков Nd1.6Ca0.4Ni1-yCuyO4+δ (y = 0.0 - 0.3). Методами термогравиметрии (NETZSCH STA 449F3) и окислительно-восстановительного (потенциометрического) титрования (Аквилон АТП-02) проведено определение абсолютного содержания кислорода в образцах Nd1.6Ca0.4Ni1 yCuyO4+δ (y = 0.0-0.3) на воздухе. Методом дилатометрии (Netzsch DIL 402C) исследовано термическое расширение спеченных образцов Nd1.6Ca0.4Ni1-yCuyO4+δ (y = 0.0-0.3). Из наклона экспериментальных зависимостей относительного удлинения образцов рассчитаны изобарические линейные коэффициенты термического расширения Nd1.6Ca0.4Ni1-yCuyO4+δ (y = 0.0-0.3). Четырех-зондовым методом на постоянном токе на воздухе с использованием автоматической системы Zirconia-318 получены температурные зависимости проводимости спеченных образцов Nd1.6Ca0.4Ni1-yCuyO4+δ (y = 0.0-0.3). Проведены исследования химической совместимости Nd1.6Ca0.4Ni1-yCuyO4+δ (y = 0.0; 0.2; 0.4) с оксидными материалами для традиционных электролитов ТОТЭ. На анализаторе дисперсности SALD-7101 Shimadzu методом лазерного светорассеяния выполнено определение распределения частиц по размерам в порошках Nd1.6Cа0.4Ni1-yCuyO4+δ (y = 0.0-0.4). Величины удельной поверхности Nd1.6Cа0.4Ni1-yCuyO4+δ (y = 0.0-0.4) оценивали методом тепловой десорбции азота на автоматическом анализаторе поверхности и пористости SoftSorbi-II ver.1.0. Определение коэффициента диффузии ионов кислорода проводили методом температурно-программируемого изотопного обмена. Электрохимическая активность катодных материалов Nd1.6Cа0.4Ni1-yCuyO4+δ (y = 0.0; 0.1; 0.3) исследована методом импедансной спектроскопии с помощью потенциостата SI 1260 и электрохимического интерфейса SI 1287 (Solartron Industries Inc.). На основе полученных данных сделан вывод о перспективности оксидных материалов Nd1.6Ca0.4Ni1-yCuyO4+δ (y = 0.0 0.4) в качестве катодных материалов для среднетемпературных ТОТЭ.Present work contains 71 pages, 52 figures, 8 tables, 73 references in the literature list. Keywords: SOLID OXIDE FUEL CELLS, CATHODE, RUDDLESDEN-POPPER STRUCTURE, THERMAL EXPANSION, ELECTROCONDUCTIVITY, CHEMICAL COMPATIBILITY. Synthesis of the Nd1.6Ca0.4Ni1-yCuyO4+δ (y = 0.0-0.4) complex oxides was carried out by the glycerol-nitrate compositions pyrolysis. Phase composition of the Nd1.6Ca0.4Ni1-yCuyO4+δ (y = 0.0-0.4) powders was determined by the X-ray diffraction (DRON-6). The crystal structure parameters of the Nd1.6Ca0.4Ni1-yCuyO4+δ (y = 0.0-0.4) oxides at 25 °C were refined by the Rietveld method using the FullProf Suite software package. High-temperature X-ray studies were performed on the Nd1.6Ca0.4Ni1-yCuyO4+δ (y = 0.0-0.3) powders. The thermogravimetry (NETZSCH STA 449F3) and redox titration (potentiometric) methods (Aquilon ATP-02) were used for the determination of an absolute oxygen content in the Nd1.6Ca0.4Ni1-yCuyO4+δ (y = 0.0-0.4) samples in air. Thermal expansion of the compact Nd1.6Ca0.4Ni1-yCuyO4+δ (y = 0.0-0.4) samples were studied using the dilatometry (Netzsch DIL 402C) method. The isobaric linear coefficients of the Nd1.6Ca0.4Ni1-yCuyO4+δ (y = 0.0-0.4) thermal expansion were calculated from linearization of the experimental dependencies of samples’ relative elongation. The temperature dependencies of the Nd1.6Ca0.4Ni1-yCuyO4+δ (y = 0.0-0.4) compact samples’ conductivity were obtained using the four-probe method at direct current in air with automatic system Zirconia-318. Chemical compatibility of the Nd1.6Ca0.4Ni1-yCuyO4+δ (y = 0.0; 0.2; 0.4) with electrolytes oxide materials for solid oxide fuel cells (SOFC) has been studied. Particle size distribution in the Nd1.6Ca0.4Ni1-yCuyO4+δ (y = 0.0-0.4) powders was determined by laser light scattering using a SALD-7101 Shimadzu dispersion analyzer. The values of the Nd1.6Ca0.4Ni1-yCuyO4+δ (y = 0.0-0.4) specific surface were estimated by the method of nitrogen thermal desorption on an automatic surface and porosity analyzer SoftSorbi-II ver.1.0. The oxygen ion diffusion coefficients were determined by temperature programmed isotope exchange of oxygen. Electrochemical activity of the Nd1.6Ca0.4Ni1-yCuyO4+δ (y = 0.0-0.4) cathode materials was investigated by impedance spectroscopy using a SI 1260 potentiostat and SI 1287 electrochemical interface (Solartron Industries Inc.). Based on the obtained data, it could be concluded that the Nd1.6Ca0.4Ni1-yCuyO4+δ oxide materials are promising as cathode materials for intermediate-temperature SOFC’s.
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Sheu, C. S., und 許家訓. „Study on structures and transport properties of Ruddlesden-Popper n=2 series manganites“. Thesis, 2001. http://ndltd.ncl.edu.tw/handle/80729878593633520637.
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碩士國立彰化師範大學
物理系
89
RE2-2xSr1+2xMn2O7+delta (RE= La, Pr or Nd) and RE1.4Sr1.6Mn2O7F2 (RE= La, Pr or Nd) ceramics are both synthesized by solid state reaction. Structure parameters are refined by Rietveld method. Low resistance( < 1 M Ohm) is measured by four probe method with a constant current source and high resistance ( > 1 M Ohm) is measured by two probe method with a constant voltage source. As the Sr concentration or oxygen content increases, the concentration of Mn3+ (Jahn-Teller ion) would decrease, and the lattice constant a is elongated while c is shorten. For samples annealed in N2, lower resistivity, higher peak temperature and more negative in thermopower are observed as compared to oxygen-annealed ones. Apparently, nitrogen annealing has the same effects on the transport properties as the pressure-induced. and pressure induced change of transport properties are the same effect. Noticeable difference between Ea obtained from resistivity and ES obtained from thermopower indicates existence of polaron in La2-2xSr1+2xMn2O7 system. Changing the size of lanthanide in (RE,Sr)3Mn2O7 will make dramatic effects on transport properties. Thermopower shows signs for transition from paramagnetic to ferromagnetic states, which can be explained by the changes of spin entropy. And thermopower shows significant field dependence near Curie temperature, where magnetic moment is short-range ferromagnetic ordering. The valence of Mn in RE1.4Sr1.6Mn2O7F2 , is likely more than +4 based on the formal valence and charge neutrality, we therefore would not expect the transport follow the double exchange mechanism. This is evidenced by resistivity measurement.
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Kinigstein, Eli Diego. „Structural and Optical Characterization of Solution Processed Lead Iodide Ruddlesden-Popper Perovskite Thin Films“. Thesis, 2018. https://doi.org/10.7916/D84B4HZ0.
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Highly efficient LEDs and photovoltaic cells based on spin coated films of layered Ruddlesden-Popper hybrid perovskites (RPP) have been recently reported. The electronic structure and phase composition of these films remains an open question, with diverse explanations offered accounting for the excellent device performance. Here we report x-ray and optical characterization of hot cast RPP thin films, emphasizing the distribution of structural and electronic properties through the film depth. Our results indicate an at least 70% phase pure n=3 film results from casting a stoichiometric solution of precursors, with minor contributions from n=2 and n=4 phases. We observe a strong correspondence between the predicted single-crystal RPP reciprocal lattice and measured RPP film wide angle scattering pattern, indicating a highly ordered [101] oriented film. This correspondence is broken at the air-film interface where new scattering peaks indicate the existence of a long wavelength structural distortion localized near the films surface. Using transient absorption spectroscopy, we show that the previously detected luminescent mid-gap states are localized on the films surface. Investigating films of varying thickness, we determine the photo-excited carrier dynamics are dominated by diffusion to this interface state, and extract an excitonic diffusivity of 0.18cm2s-1. We suggest that the observed surface distortion is responsible for the creation of luminescent mid-gap states.
Bücher zum Thema "RUDDLESDEN-POPPER STRUCTURE"
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Kinigstein, Eli Diego. Structural and Optical Characterization of Solution Processed Lead Iodide Ruddlesden-Popper Perovskite Thin Films. [New York, N.Y.?]: [publisher not identified], 2018.
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Smirnov, Mikhail, Pierre Saint-Grégoire und Pierre Saint-Gregoire. Perovskites and Other Framework Structure Crystalline Materials : (2D - Perovskites, Aurivillius, Ruddlesden-Popper, Dion-Jacobson Phases, Tungsten Bronzes, Clays, and Others). Independently Published, 2021.
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Perovskites and Other Framework Structure Crystalline Materials : (2D - Perovskites, Aurivillius, Ruddlesden-Popper, Dion-Jacobson Phases, Tungsten Bronzes, Clays, and Others). Independently Published, 2021.
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Smirnov, Mikhail, und Pierre Saint-Grégoire. Perovskites and Other Framework Structure Crystalline Materials - Part B : (2D-Perovskites, Aurivillius, Ruddlesden-Popper, Dion-Jacobson Phases, Tungsten Bronzes, Clays, and Others). Lulu Press, Inc., 2021.
Den vollen Inhalt der Quelle findenBuchteile zum Thema "RUDDLESDEN-POPPER STRUCTURE"
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Wang, Fengqi, Hai Zhang, Wei Cai, Rongli Gao und Chunlin Fu. „Microstructure and Electric Properties of (Sr1−xCax)3Sn2O7 Ceramics with Ruddlesden-Popper Structure“. In Advanced Functional Materials, 189–97. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0110-0_22.
Der volle Inhalt der QuelleKonferenzberichte zum Thema "RUDDLESDEN-POPPER STRUCTURE"
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Bergonzoni, Ashanti, Sébastien Pillet, Kamel Boukheddaden, Aymen Yangui, Laurent Pedesseau, Boubacar Traoré, Claudine Katan und Jacky Even. „DFT Analysis of Low Temperature Structural Distorsions in a Series of White-Light Emitting Ruddlesden-Popper Perovskites“. In nanoGe Fall Meeting 2021. València: Fundació Scito, 2021. http://dx.doi.org/10.29363/nanoge.nfm.2021.065.
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