Cobalt Oxides: From Crystal Chemistry to Physics - download pdf or read online

By Prof. Dr. Bernard Raveau, Prof. Dr. Md. Motin Seikh(auth.)

ISBN-10: 3527331476

ISBN-13: 9783527331475

ISBN-10: 3527645527

ISBN-13: 9783527645527

Exceptional within the breadth and intensity of its insurance of all very important facets, this publication systematically treats the digital and magnetic homes of stoichiometric and non-stoichiometric cobaltites in either ordered and disordered stages. Authored by way of a pioneer and a emerging famous person within the box, the monograph summarizes, organizes and streamlines the differently difficult-to-obtain details in this subject. An introductory bankruptcy units forth the crystal chemistry of cobalt oxides to put the basis for an figuring out of the advanced phenomena saw during this fabrics type. particular emphasis is put on a finished dialogue of cobaltite actual houses in several structural households.

Providing an intensive creation to cobalt oxides from a chemical and actual point of view as a foundation for knowing their intricacies, it is a must-have for either skilled researchers in addition to entrants to the field.

Content:
Chapter 1 Crystal Chemistry of Cobalt Oxides (pages 3–70):
Chapter 2 digital and Magnetic homes of Stoichiometric Perovskite Cobaltites (pages 71–128):
Chapter three digital and Magnetic homes of Oxygen?Deficient Perovskite Cobaltites Sr1?xLnxCoO3?? and SrCo1?xMxO3?? (pages 129–178):
Chapter four digital and Magnetic homes of Ruddlesden–Poepper?Type Cobaltites (pages 179–210):
Chapter five digital and Magnetic houses of Cobaltites with a 3D “Triangular Lattice” (pages 211–247):
Chapter 6 digital and Magnetic houses of “Triangular” Layered Cobaltites (pages 249–295):
Chapter 7 digital and Magnetic houses of the “Unidimensional” Cobaltite Ca3Co2o6 (pages 297–319):

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Additional info for Cobalt Oxides: From Crystal Chemistry to Physics

Example text

Changing the Bi/Sr ratio can also change the ordering of both these CoO5 pyramids and their waving in the 2201-type structure. This has been observed in the cobaltite Bi2Sr2CoO6þd (Bi8Sr8Co4O25) [180]. 20), double “BiO” layers are sandwiched between SrO layers and wave in the structure, whereas the “single” perovskite layers consist of quadruple ribbons of CoO5 pyramids whose apical corners are directed in opposite directions. 6. Adapted from Ref. [178]. 45 A. In fact, the Bi2Sr2CoO6þd phases exhibit both commensurate and incommensurate structures due to the presence of the 6s2 lone pair of Bi3þ and to oxygen excess.

The structure of NaxCoO2 consists of CdI2-type CoO2 layers intercalated with Naþ ions with a trigonal prismatic (P) or octahedral (O) environment. There are four unique structural forms of NaxCoO2, a-, a0 -, b-, and c-phases; they differ in the stacking sequence of the close-packed oxygen layers that are perpendicular to the caxis [210–213]. Thus, the symmetry of these four different phases is governed by the sodium content: . . 9 x 1. It is often called the O3 structure (O indicates the octahedral coordination of Naþ and 3 is the number of layers in repeat).

However, a few experimental evidences of long-range ordering, either commensurate or incommensurate, have been given using neutron or electron diffraction and most of the reported works are devoted to theoretical considerations using various methods of calculation [221–223]. A detailed electron diffraction study on powder samples revealed several new structures [220]. 5 composition shows commensurate superstructure reflections for relatively low exposure time to electron beam with the vector q along the [110] direction.

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Cobalt Oxides: From Crystal Chemistry to Physics by Prof. Dr. Bernard Raveau, Prof. Dr. Md. Motin Seikh(auth.)


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