## Physical Properties of Crystals |

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Page 94

their

defined as: increase in length P'Q'—PQ Au original length T PQ Az The strain at

the point P is defined as: e = lim Au – du (1) Ajo Air T doc' The strain at any point

is thus ...

their

**displacements**relative to one another. The strain of the section PQ isdefined as: increase in length P'Q'—PQ Au original length T PQ Az The strain at

the point P is defined as: e = lim Au – du (1) Ajo Air T doc' The strain at any point

is thus ...

Page 98

2.1. Homogeneous two-dimensional strain. When the distortion is homogeneous

the eg components are all constants and equations (*) *** u, - (u,)--ego, (i,j = 1,2),

(6) where (uo), is the

2.1. Homogeneous two-dimensional strain. When the distortion is homogeneous

the eg components are all constants and equations (*) *** u, - (u,)--ego, (i,j = 1,2),

(6) where (uo), is the

**displacement**of the point at the origin.f If a curve f(x1, x2) ...Page 99

In a pure rotation the

vector. Therefore, u, a., H 0 (scalar product), or e;2; a y = 0. (7) Since equation (7)

is true for all act, the coefficients on the left-hand side must all be zero. Hence €ij -

0 ...

In a pure rotation the

**displacement**of any point is perpendicular to its radiusvector. Therefore, u, a., H 0 (scalar product), or e;2; a y = 0. (7) Since equation (7)

is true for all act, the coefficients on the left-hand side must all be zero. Hence €ij -

0 ...

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### Contents

THE GROUND WORK OF CRYSTAL PHYSICS | 3 |

Summary | 29 |

EQUILIBRIUM PROPERTIES | 45 |

47 other sections not shown

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### Common terms and phrases

angle anisotropic applied biaxial birefringence centre of symmetry Chapter conductivity constant crystal classes crystal properties crystal symmetry cube cubic crystals defined denoted diad axis dielectric direction cosines displacement elastic compliances electric field electro-optical electro-optical effect ellipsoid equal equation example expression follows forces given gives grad heat flow Hence indicatrix isothermal isotropic magnetic magnitude matrix notation measured moduli Mohr circle monoclinic number of independent Onsager's Principle optic axis optical activity orientation parallel permittivity perpendicular photoelastic effect piezoelectric effect plane plate polarization positive principal axes produced pyroelectric effect quadric radius vector referred refractive index relation representation quadric represents right-handed rotation scalar second-rank tensor shear shown shows strain stress symmetry elements Table temperature gradient thermal expansion thermodynamics thermoelectric effects Thomson heat tion transformation law trigonal uniaxial unit volume values wave normal wave surface written zero