By Rochelle M. Cornell, Udo Schwertmann

Now in its moment, thoroughly revised and prolonged variation, this booklet brings jointly in a single, compact quantity all features of the knowledge to be had. It provides a coherent, brand new account of the homes, reactions and mechanisms of formation of those compounds. furthermore, there are chapters facing iron oxides in rocks and soils, as biominerals and as corrosion items including equipment of synthesis and the various functions of those compounds in addition to their position within the surroundings. The specialist authors contain a lot fresh facts from their very own laboratories and point out possibilities for additional study. unique gains are the electron micrographs and colour plates including the numerous various spectra used to demonstrate houses and features of habit. various tables and graphs permit traits and relationships to be noticeable at a look. the complete is rounded off by means of an in depth bibliography. a vital quantity in and to all researchers who, no matter what their history and point of expertise, have an interest during this swiftly increasing box.

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Extra resources for The Iron Oxides: Structure, Properties, Reactions, Occurrences and Uses, Second Edition

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7558 nm. Water molecules are considered to occupy a fraction of the large 8-coordinated positions in the structure (Fig. 10 b). The number of formula units per unit cell is eight. The name bernalite was given to crystals discovered in museum samples taken from the Broken Hill mine (NSW, Australia) around the beginning of the century. A second occurrence of bernalite from the Clara Mine in the Black Forest (Germany) was characterized by Walenta (1995; 2001). 2 Fe(OH)2 This compound is isostructural with brucite (Mg(OH)2) and CdI2.

1, several of the Fe oxides have isostructural equivalents in which cations other than Fe occupy the interstices of the oxygen framework. The diaspore structure of goethite (a-FeOOH), for example, is adopted by diaspore (a-AlOOH) itself, groutite (a-MnOOH), bracewellite (a-CrOOH) and montroseite (VOOH). All these oxide-hydroxides exist as pure minerals although they are much rarer than goethite. Analogous synthetic phases with the diaspore structure are ScOOH and GaOOH. The various cations do not modify the structure, but they do affect the size of the unit cell (Muller & Joubert, 1974).

Fig. 6 Structure of akaganite. a) Arrangement of octahedral double chains in tunnels with chloride ions in the centre of the tunnels. b) Ball-and-stick model with unit cell outlined. , 1962). 0 nm, i. e. hollow subcrystals. This structure was later questioned when reversible N2 adsorption/desorption isotherms were obtained (Paterson & Tait, 1977). , 1979), i. e. the proposed substructure was shown to be an artefact. TEM features such as mottling and the development of striations, which had appeared to provide support for a substructure, arose from radiation damage in the electron beam.

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