## Physical Properties of Crystals: Their Representation by Tensors and Matrices |

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Page 68

Corresponding to equation (1) of Chapter III, we have D = «0E+P, (1) where KQ is

a scalar constant, the

rationalized m.k.s. units of 8-854 x 10-12.f The vector relation (1) is illustrated in

Fig.

Corresponding to equation (1) of Chapter III, we have D = «0E+P, (1) where KQ is

a scalar constant, the

**permittivity**of a vacuum, with the numerical value inrationalized m.k.s. units of 8-854 x 10-12.f The vector relation (1) is illustrated in

Fig.

Page 69

express the

we define the dimensionless constant K = K/KO, (4) known as the relative

place of (2), ...

express the

**permittivity**in terms of the**permittivity**of a vacuum. For this purposewe define the dimensionless constant K = K/KO, (4) known as the relative

**permittivity**or the dielectric constant. In an anisotropic substance we have, inplace of (2), ...

Page 73

The ratio of the capacities in the two cases is therefore C _ a _ component of Dc

parallel to Ec _ * - ~ where K is the

the direction of the applied field Ec, in the sense defined in § 6.1 of Chapter I. Fio.

The ratio of the capacities in the two cases is therefore C _ a _ component of Dc

parallel to Ec _ * - ~ where K is the

**permittivity**and K is the dielectric constant inthe direction of the applied field Ec, in the sense defined in § 6.1 of Chapter I. Fio.

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### Contents

THE GROUNDWORK OF CRYSTAL PHYSICS | 3 |

EQUILIBRIUM PROPERTIES | 51 |

ELECTRIC POLARIZATION | 68 |

15 other sections not shown

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### Common terms and phrases

angle anisotropic applied axial vector centre of symmetry Chapter coefficients conductivity constant crystal classes crystal properties crystal symmetry cube cubic crystals defined denoted diad axis dielectric direction cosines displacement dummy suffix electric field ellipsoid equal equation example expression follows force given heat flow Hence hexagonal homogeneous indicatrix isothermal isotropic left-handed length longitudinal magnetic magnitude matrix notation measured moduli monoclinic number of independent Onsager's Principle optical activity orientation parallel Peltier permittivity perpendicular photoelastic effect piezoelectric effect plane plate polarization positive principal axes produced pyroelectric pyroelectric effect quantities radius vector referred refractive refractive index relation representation quadric represented right-handed rotation scalar second-rank tensor set of axes shear stress suffix notation surface susceptibility symmetry elements Table temperature gradient tensile stress thermal expansion thermodynamics thermoelectric effects Thomson heat tion transformation law trigonal uniaxial unit volume values written Young's Modulus zero