By Prof. Dr. Bernard Raveau, Prof. Dr. Md. Motin Seikh(auth.)
Unheard of within the breadth and intensity of its insurance of all vital points, this publication systematically treats the digital and magnetic houses of stoichiometric and non-stoichiometric cobaltites in either ordered and disordered stages. Authored by way of a pioneer and a emerging superstar within the box, the monograph summarizes, organizes and streamlines the in a different way difficult-to-obtain details in this subject. An introductory bankruptcy units forth the crystal chemistry of cobalt oxides to put the foundation for an knowing of the complicated phenomena saw during this fabrics category. specific emphasis is put on a complete dialogue of cobaltite actual houses in several structural households.
Providing a radical creation to cobalt oxides from a chemical and actual perspective as a foundation for realizing their intricacies, it is a must-have for either skilled researchers in addition to entrants to the field.
Chapter 1 Crystal Chemistry of Cobalt Oxides (pages 3–70):
Chapter 2 digital and Magnetic houses 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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Unprecedented within the breadth and intensity of its insurance of all vital facets, this publication systematically treats the digital and magnetic houses of stoichiometric and non-stoichiometric cobaltites in either ordered and disordered stages. Authored by way of a pioneer and a emerging megastar within the box, the monograph summarizes, organizes and streamlines the another way difficult-to-obtain details in this subject.
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Extra info for Cobalt Oxides: From Crystal Chemistry to Physics
28). Thus, besides the mixed valence Co3þ/Co4þ, the ordering of Naþ and vacancies that governs the charge ordering on cobalt sites has a great impact upon the physical properties of these lamellar oxides, as will be discussed in section 6. Besides the NaxCoO2 bronzes that have been extensively studied, some other alkaline cobaltites exhibit the same type of structure. 28 Two-dimensional CoO2 layers separated by a thick insulating layer of Naþ ions and H2O molecules in superconducting NaxCoO2ÁyH2O.
Extensive experimental and computational investigations have been carried out to ﬁnd out the stable sodium vacancy orderings at various sodium concentrations [220–224]. 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 .
However, the presence of some octahedra cannot be ruled out. The coordination around cobalt may be tetrahedral if the O(4) site is unoccupied . 14b), the anionic vacancies between the pyramidal layers being ﬁlled at 13% only by oxygen. 2 Co2O6 . 14b). It is this smaller size of Y3þ and Ca2þ cations that favors the formation of such double pyramidal cobalt layers . 2Co2O6 both tetragonal I4/mmm. The first one is nonstoichiometric and exhibits 87% oxygen vacancies on the apical oxygen sites of the double layers (&), whereas the second one exhibits double pyramidal cobalt layers, similar to La2SrCu2O6.