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

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Page 142

We now see that the elastic properties of cubic crystals,

tensors, are not isotropic. (iv) Numerical example. For a numerical example we

choose ammonium dihydrogen phosphate (ADP) (class 22m). This was the

crystal for ...

We now see that the elastic properties of cubic crystals,

**given**by fourth-ranktensors, are not isotropic. (iv) Numerical example. For a numerical example we

choose ammonium dihydrogen phosphate (ADP) (class 22m). This was the

crystal for ...

Page 254

7744, of course, also determines the changes in refractive index resulting from a

shear stress applied about a cube axis. Some measured values of the TTW and p

^ for cubic crystals are

7744, of course, also determines the changes in refractive index resulting from a

shear stress applied about a cube axis. Some measured values of the TTW and p

^ for cubic crystals are

**given**in Table 17. The values are sometimes slightly ...Page 278

(iii) glide plane: an operation in which each point is moved to the position of its

mirror image in a certain plane, and then translated parallel to this plane. (iv) n-

fold rotation axis: a rotation of Zjr/n about a

integer.

(iii) glide plane: an operation in which each point is moved to the position of its

mirror image in a certain plane, and then translated parallel to this plane. (iv) n-

fold rotation axis: a rotation of Zjr/n about a

**given**axis, where n is a positiveinteger.

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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