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Book Structure property Relationships in Oxide Ion Conducting Hexagonal Perovskites

Download or read book Structure property Relationships in Oxide Ion Conducting Hexagonal Perovskites written by Kirstie S. McCombie and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Perovskites

Download or read book Perovskites written by Richard J. D. Tilley and published by John Wiley & Sons. This book was released on 2016-03-03 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: Uniquely describes both the crystallography and properties of perovskite related materials. Practical applications in solar cells, microelectronics and telecommunications Interdisciplinary topic drawing on materials science, chemistry, physics, and geology Contains problems and answers to enhance knowledge retention

Book Structure property Relationships Synthesis and Characterization of Perovskite related Transition Metal Oxides

Download or read book Structure property Relationships Synthesis and Characterization of Perovskite related Transition Metal Oxides written by Louis Whaley and published by . This book was released on 2007 with total page 207 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fundamental structural component of perovskite-related phases is the octahedrally coordinated transition metal ion, symbolized as BO6 . Corner-sharing networks of BO6 octahedra are present in perovskites and related Ruddlesden-Popper Phases, ABO3 and AO(ABO 3)n, respectively. Face-sharing octahedra arranged into columns are characteristic of hexagonal, perovskite-related phases, and the relationship will be described in detail in Chapter 1. Edge sharing octahedra are characteristic of Keggin- and Lindquist-type polyoxometallates, which at first glance, seem unconnected from perovskites. However, Chapter 1 will show the deep connections among all of the phases mentioned above, by starting with perovskite phases.

Book Oxide Ion Conduction in the Dion Jacobson Type Layered Perovskites

Download or read book Oxide Ion Conduction in the Dion Jacobson Type Layered Perovskites written by Wenrui Zhang and published by Springer Nature. This book was released on 2022-05-16 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reports a study of a class of Dion–Jacobson-type layered perovskite oxides in which high oxide-ion conductivities in phases were discovered for the first time in the world. The oxide-ion conductors are important in various energy conversion devices and environmental protection applications such as solid-oxide fuel cells, oxygen gas sensors, oxygen separation membranes, and oxygen-based catalysts. The discoveries are based on a new screening method, called the bond valence method, combined with an original design concept. The present finding of high oxide-ion conductivity reported in the thesis suggested the potential of Dion–Jacobson phases as a platform to identify superior oxide-ion conductors. To understand what causes such high oxide-ion conductivities in these layered perovskite oxides, the author analyzed their crystal structures at high temperature and described the relationship between oxide-ion conductivities and their crystal structures. A deep understanding of the mechanisms of oxide-ion diffusivity at an atomic level in the Dion–Jacobson phases is clarified. The discovery of these materials, the new screening method, and the original design concept make possible the realization of many environment-friendly technologies. The findings in this thesis facilitate the possibilities for many novel applications that will help lead to a sustainable future.

Book Perovskites

Download or read book Perovskites written by Richard J. D. Tilley and published by John Wiley & Sons. This book was released on 2016-03-15 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: Uniquely describes both the crystallography and properties of perovskite related materials. Practical applications in solar cells, microelectronics and telecommunications Interdisciplinary topic drawing on materials science, chemistry, physics, and geology Contains problems and answers to enhance knowledge retention

Book Structure Properties and Preparation of Perovskite type Compounds

Download or read book Structure Properties and Preparation of Perovskite type Compounds written by Francis S. Galasso and published by Pergamon. This book was released on 1969 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: Structure, Properties and Preparation of Perovskite-Type Compounds, Volume 5 presents the various methods of preparing powders, single crystals, and thin films of perovskite-type compounds. This book discusses the structure of perovskite-type compounds and their properties. Organized into 11 chapters, this volume begins with an overview of the structure, properties, and preparation of perovskite-type compounds. This text then examines how X-ray diffraction can be used to determine unit cell data and to orient single crystals. Other chapters consider the effect of nuclear radiation on the prop ...

Book Perovskites

Download or read book Perovskites written by Maxim Borowski and published by . This book was released on 2010 with total page 571 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Composition structure property Relationship in Cs based Halide Perovskites Using Electronic Structure Calculations

Download or read book Composition structure property Relationship in Cs based Halide Perovskites Using Electronic Structure Calculations written by Anirban Naskar and published by . This book was released on 2019 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: The last three decades have witnessed significant progress in electronic materials due to the constant discovery of new materials for various applications. ABX3 (A = Cs; B = Ca, Sr, Ba; X =I, Br, Cl, or F) s-block halide perovskites are widely considered as a scintillator material and a replacement of lead-based solar device due to their excellent electronic properties. The performance of the device is linked to the atomic and electronic structure of the halide perovskites. Using ab-initio calculations, we studied the effect of chemical composition, atomic structure on the electronic properties (bandgap) of s-block halide perovskite for both bulk and surfaces. We found that the bulk and the surface bandgaps of the perovskites are closely related to the intrinsic properties such as atomic or ionic size, electronegativity, bond-dissociation energy of B and X. The bandgap changes on the surfaces compare to the bulk are explained in terms of the structural changes such as bond-distance and bond-angle. Defects are produced inevitably during the synthesis of these compounds and largely depends on the synthesis condition. It has been reported that the point defects such as antisite defects are detrimental to carrier transport as they create localized electronic (deep trap) defects on the band gap. Using ab-initio calculations, we also investigated the impact of antisite defect, XB on the electronic properties of ABX3 (A = Cs; B = Ca, Sr, or Ba; X =I, Br, Cl, or F) bulk perovskites. Our results reveal that the formation of defect state in the band gap due to antisite defect, XB strongly depends on the composition and the crystal structure. We observed that for a fixed composition of A and B the electronic defect forms at a higher energy level on the bandgap for bigger halogen atom compared to the halogen atom of smaller size. Further, the antisite defect creates localized states at two different locations in the band-gap for the orthorhombic structure. Whereas, for the same composition with the cubic crystal structure, the antisite defect creates a localized electronic state only at one location. Finally, we linked the location of these electronic defect states in the band gap to the intrinsic property of the constituent elements such as bond-dissociation energy and the atomic size, which can be a useful tool to understand and predict the position of localized electronic states produced by the point defects.

Book Structure property Relationships in Organic inorganic Halide Perovskite Solar Cells

Download or read book Structure property Relationships in Organic inorganic Halide Perovskite Solar Cells written by Sarthak Piyushkumar Jariwala and published by . This book was released on 2021 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Structure property Relationships of BaCeO Perovskites for the Oxidative Dehydrogenation of Alkanes

Download or read book Structure property Relationships of BaCeO Perovskites for the Oxidative Dehydrogenation of Alkanes written by and published by . This book was released on 1997 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The oxidative dehydrogenation (ODH) reactions for the formation of two important organic feedstocks ethylene and propylene are of great interest because of the potential in capital and energy savings associated with these reactions. Theoretically, ODH can achieve high conversions of the starting materials (ethane and propane) at lower temperatures than conventional dehydrogenation reactions. The important focus in this study of ODH catalysts is the development of a structure-property relationship for catalyst with respect to selectivity, so as to avoid the more thermodynamically favorable combustion reaction. Catalysts for the ODH reaction generally consist of mixed metal oxides. Since for the most selective catalyst lattice oxygen is known to participate in the reaction, catalysts are sought with surface oxygen atoms that are labile enough to perform dehydrogenation, but not so plentiful or weakly bound as to promote complete combustion. Also, catalysts must be able to replenish surface oxygen by transport from the bulk. Perovskite materials are candidates to fulfill these requirements. The authors are studying BaCeO3 perovskites doped with elements such as Ca, Mg, and Sr. During the ODH of the alkanes at high temperatures, the perovskite structure is not retained and a mixture of carbonates and oxides is formed, as revealed by XRD. While the Ca doped materials showed enhanced total combustion activity below 600 C, they only showed enhanced alkene production at 700 C. Bulk structural and surface changes, as monitored by powder X-ray diffraction, and X-ray photoelectron spectroscopy are being correlated with activity in order to understand the factors affecting catalyst performance, and to modify catalyst formulations to improve conversion and selectivity.

Book Structure property Relationships in Noncentrosymmetric Layered Perovskites

Download or read book Structure property Relationships in Noncentrosymmetric Layered Perovskites written by Andrew Ryan Sharits and published by . This book was released on 2016 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work focuses on understanding the structure property relationships in layered perovskites. Certain properties such as ferroelectricity and luminescence are highly dependent upon the crystal structure and can be affected by structural distortions. This makes understanding the crystal structure imperative as it can be adverse or beneficial to the physical property of interest. Perovskites and layered perovskites are prone to structural distortions. As such it is important to understand the forces that drive distortions and how to control them so advantageous properties can be achieved. Chapter 2 discusses the luminescence of Eu3+ in the family of doubly ordered double perovskites NaREMgWO6 (RE = La, Gd, Y). NaYMgWO6, a new member of the family, was found to crystallize in P21 space group and is isostructural with NaGdMgWO6. Emissions characteristic of Eu3+ ions (5D0 -> 7F4, 3, 2, 1,0) were observed, with the most intense transition being the 5D0 -> 7F2 transition near 615 nm. Substitution of Eu3+ onto a more compressed RE site results in a blue shift of the charge transfer excitation band and an increase in the intensity of 5D0 -> 7F2 transition. These hosts display comparable if not better luminescence than Y2O3:Eu3+, a commonly used commercial standard, demonstrating their promise as red phosphors. Chapter 3 and Chapter 4 focus on understanding octahedral tilting, phase transitions and ferroelectric properties in Ruddlesden Popper (RP) phases. Data mining using the ICSD was performed and showed that RP phases typically crystallize in 4 common tilt systems: I4/mmm (a0a0c0), P42/mnm (a0b-c0), Cmcm (a-a-c0) and Cmc21 (a-a-c+). A sorting chart was created using the perovskite tolerance factor and the difference in ionic radii of the A-site cations. This led to the compounds, Ln2SrSc2O7 (Ln= La, Pr, Nd, Sm, Eu, Gd) and Sr3Zr2O7, which fall on the sorting chart in a location that suggests they should be susceptible to a polar distortion. Using distortion mode Rietveld refinements to analyze x-ray and neutron diffraction data, these compounds were discovered to crystallize in the polar space group, Cmc21. Detailed analysis of the phase transitions and ferroelectric properties were explored in La2SrSc2O7 and Nd2SrSc2O7. Chapter 5 focuses on the crystal structures of the family of Dion-Jacobson (DJ) phases, ALnNb2O7 (A=Cs, Rb; Ln= La, Pr, Nd). X-ray diffraction of the structure showed subtle splitting suggesting a lower symmetry than the parent space group P4/mmm. Neutron diffraction of RbLnNb2O7 showed a doubling of the c-axis whereas in the CsLnNb2O7 this was not observed. Synchrotron diffraction showed peak splitting in ALaNb2O7 that had not been observed in the x-ray data. It was found that the RbLaNb2O7 and CsLaNb2O7 crystallized in the nonpolar Cmca and Cmmm space groups, respectively. RbLnNb2O7 (Ln = Pr, Nd) and CsPrNb2O7 were found to crystallize in the polar space groups Ima2 and Pmc21. The driving force behind the octahedral tilting will be discussed.

Book Structure property Relationships of Some Mixed Transition Metal Perovskites

Download or read book Structure property Relationships of Some Mixed Transition Metal Perovskites written by and published by . This book was released on 2003 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: