International
Tables for
Crystallography
Volume D
Physical properties of crystals
Edited by A. Authier

International Tables for Crystallography (2013). Vol. D, ch. 1.7, p. 188

Section 1.7.3.1.2. Isotropic class

B. Boulangera* and J. Zyssb

aInstitut Néel CNRS Université Joseph Fourier, 25 rue des Martyrs, BP 166, 38042 Grenoble Cedex 9, France, and bLaboratoire de Photonique Quantique et Moléculaire, Ecole Normale Supérieure de Cachan, 61 Avenue du Président Wilson, 94235 Cachan, France
Correspondence e-mail:  benoit.boulanger@grenoble.cnrs.fr

1.7.3.1.2. Isotropic class

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The isotropic class corresponds to the equality of the three principal indices: the index surface is a one-sheeted sphere, so [n^+=n^-], [\rho^+=\rho^-=0] for all directions of propagation, and any electric field vector direction is allowed as in an amorphous material.








































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