ON THE MADELUNG PART OF LATTICE ENERGY - NEW PATHWAYS TO USE IT AS A TOOL IN SOLID-STATE CHEMISTRY .1. - Research portal of Justus Liebig University Giessen:

Journal article

ON THE MADELUNG PART OF LATTICE ENERGY - NEW PATHWAYS TO USE IT AS A TOOL IN SOLID-STATE CHEMISTRY .1.

Authors list: HOPPE, R

Publication year: 1995

Pages: 555-567

Journal: A Journal of Physical Sciences

Volume number: 50

Issue number: 6

ISSN: 0932-0784

Publisher: De Gruyter

Abstract:
The Born-Haber Cycle (BHC) is critically reviewed, the origin of severe limitations in its application is shown. Partly this Is based on the construction of the third step, partly it is connected with the fact that most of the ''classical'' anions of inorganic chemistry are instable, ''unobservable'' gaseous entities. The Madelung Part of Lattice Energy, MAPLE*, is extentionally analyzed (e.g. TiO2) to demonstrate that the similarity of thermodynamical properties like Delta H degrees(298) of all modifications, reflected in MAPLE, is non-trivial. The analogous analysis with e.g. BaTiO3 proves that neither the classical ''central ion'' (here Ti4+) nor the ''completing'' cation (here Ba2+) but the ''anions'' coordinating the last mentioned cation BaO gain energy and, in this sense, ''stabilize'' the complex. Even simple compounds (e.g. A-La2O3) show surprising geometrical arrangements, in striking contrast to often used but simple minded concepts like ''Bond Length/Bond Strength'' and its derivatives like CHARDI, whereas such ''oddities'' are explained by MAPLE. The application of the theorem of additivity of MAPLE (MAPLE(polynary) = Sigma MAPLE(binary)), that passes even in the case of hydrates, and its limitations are discussed. Guided by MAPLE, surprisingly complicated structures (e.g. Cs2Li3I5) of polynary derivatives of structurally exceedingly simple binary compounds become ''understandable''. If ''molecular'' entities like SO3 are involved, limitations can be excluded using ''increments''. Last not least, MAPLE is the first known guide to a multi-dimensional but strict scheme of characterisation of Solid State Structures in the sense of Linne's ideas, based on geometrical facts only.

Citation Styles

Harvard Citation style: HOPPE, R. (1995) ON THE MADELUNG PART OF LATTICE ENERGY - NEW PATHWAYS TO USE IT AS A TOOL IN SOLID-STATE CHEMISTRY .1., A Journal of Physical Sciences, 50(6), pp. 555-567

APA Citation style: HOPPE, R. (1995). ON THE MADELUNG PART OF LATTICE ENERGY - NEW PATHWAYS TO USE IT AS A TOOL IN SOLID-STATE CHEMISTRY .1.. A Journal of Physical Sciences. 50(6), 555-567.