## Physical Properties of Crystals |

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Page 28

1.9) such that OP is

plane at P is rl of al-Hrla Gaza-Hrlaosa's = 1. Therefore the normal at P has

direction cosines proportional to liol, laos, laos. Hence, the normal at P is

to j.

1.9) such that OP is

**parallel**to E, then P = (rl, rls, rls), where OP = r. The tangentplane at P is rl of al-Hrla Gaza-Hrlaosa's = 1. Therefore the normal at P has

direction cosines proportional to liol, laos, laos. Hence, the normal at P is

**parallel**to j.

Page 79

Monoclinic. a,

to the diad axis: (0,p, 0). Class m: p has any direction in the symmetry plane: (p1,

0, pa). Orthorhombic. z1, z2, as

Monoclinic. a,

**parallel**to the diad axis, rotation or inverse, (y). Class 2: p**parallel**to the diad axis: (0,p, 0). Class m: p has any direction in the symmetry plane: (p1,

0, pa). Orthorhombic. z1, z2, as

**parallel**to crystallographic ac, y, z respectively.Page 281

(v) cubic: Oz, Oy, Oz

the 3-fold axes; a = b = c, q = 8 = y = 90°. (vi) trigonal: Oz

; a = b + c, q = 8 = 90°, y = 120°. (vii) hexagonal: Oz

(v) cubic: Oz, Oy, Oz

**parallel**to the edges of the cube whose body diagonals arethe 3-fold axes; a = b = c, q = 8 = y = 90°. (vi) trigonal: Oz

**parallel**to the 3-fold axis; a = b + c, q = 8 = 90°, y = 120°. (vii) hexagonal: Oz

**parallel**to the 6-fold axis; ...### What people are saying - Write a review

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### Contents

THE GROUND WORK OF CRYSTAL PHYSICS | 3 |

Summary | 29 |

EQUILIBRIUM PROPERTIES | 45 |

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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