By E. Burzo (auth.), H.P.J. Wijn (eds.)
The Landolt-Börnstein quantity 27 offers with the magnetic houses of non-metallic inorganic compounds in accordance with transition components, resembling there are pnictides, chalcogenides, oxides, halides, borates, and at last phosphates and silicates, the latter provided during this subvolume I. A initial survey of the contents of all subvolumes that experience already seemed or were deliberate to seem is outlined at the inside front hide. The silicates are very complicated platforms, intensively studied in literature. They conceal huge sessions of minerals in addition to man made samples. In reading their magnetic and magnetically similar houses we basically the class given via the Mineral Reference guide (E. H. Nickel, N. C. Nickols, Van Nostrand Reinhold, 1991). person chapters are devoted to orthosilicates, sorosilicates, cyclosilicates, inosilicate, phyllosilicates and tectosilicates. a result of large quantity of information those chapters needed to be unfold over a number of subvolumes I1, I2, and so on. . - In each one bankruptcy different teams of minerals and artificial silicates have been exceptionally analyzed in numerous sections. for every staff, extra silicate minerals, extra lately said, in addition to man made samples having comparable compositions and/or crystal constructions have been additionally thought of. The silicates integrated in each one part have been first of all tabulated, stating their compositions. the forged strategies among the top member compounds have been additionally defined. the gap teams and lattice parameters for many silicates have been tabulated. Crystal buildings of consultant silicates have been mentioned in additional element and the atomic positions have been given.
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Additional info for Magnetic Properties of Non-Metallic Inorganic Compounds Based on Transition Elements
3 . The high-pressure chlorite is more compressible than the low-pressure phase. The XRD patterns were very similar from 10 to 27 GPa, indicating that it persists stably with no significant change in the b value up to very high pressure. It was proposed that the transformation is not polytypic and that the distortion reflects a reorganization of the interlayer hydrogen bonding, possibly involving novel proton behavior as adjacent sheets of cations of the brucite-like and tetrahedral layers close down on the sheet of interlayer protons.
Chlorites and related silicates 2 displacements of the interlayer planes within the (001) plane. 8 A˚. 3 A˚. A model was proposed where, at high temperatures, the interlayer planes become more extended and planar, but the planes “crumple” upon cooling to approach more closely higher-order nearest-neighbor atoms. These changes upon cooling might be a significant driving force for additional cation and anion ordering in the interlayer, since the interlayer sites have different second-nearest-neighbor environments.
In that structure, Li was found to be ordered in one interlayer site where it achieves the best local charge balance. Interlayer Li+ lies on a vertical line directly between a tetrahedral cation in the 2:1 layer below and a tetrahedral cation in the 2:1 layer above. The more highly charged interlayer Al3+ cations, however, only have a tetrahedral cation on one side and the center of a six-membered ring on the other side. The refinement implies that the two sides of the 2:1 layer may have different tetrahedral compositions and charges.