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

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Page 207

6. Thermodynamical arguments.

for reversible processes do not apply. It is true that the crystal may be in a steady

state I 5 CONDUCTIVITY 207 Thermodynamical arguments

6. Thermodynamical arguments.

**Onsager's Principle**We did not have to ... lawsfor reversible processes do not apply. It is true that the crystal may be in a steady

state I 5 CONDUCTIVITY 207 Thermodynamical arguments

**Onsager's Principle**.Page 208

We shall now describe what is known as

principle which applies to all transport phenomena — under which term may be

included the conduction of heat, the conduction of electricity, and the transport of

...

We shall now describe what is known as

**Onsager's Principle**. This is a generalprinciple which applies to all transport phenomena — under which term may be

included the conduction of heat, the conduction of electricity, and the transport of

...

Page 231

Thomson's second relation follows from

Hence we may write for the Peltier heat and the difference of the Thomson heats,

na6 = - nmaT) | (ii)' ra-rb = T(d'<l,!dT*) /• (14) [2] Thermoelectric effects in isotropic

...

Thomson's second relation follows from

**Onsager's Principle**: dftdT = -own (idHence we may write for the Peltier heat and the difference of the Thomson heats,

na6 = - nmaT) | (ii)' ra-rb = T(d'<l,!dT*) /• (14) [2] Thermoelectric effects in isotropic

...

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### Contents

THE GROUNDWORK OF CRYSTAL PHYSICS | 3 |

EQUILIBRIUM PROPERTIES | 51 |

ELECTRIC POLARIZATION | 68 |

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### Common terms and phrases

angle anisotropic applied biaxial birefringence centre of symmetry Chapter coefficients conductivity crystal classes crystal properties crystal symmetry cube cubic crystals defined denoted diad axis dijk direction cosines electric field electro-optical effect ellipsoid equal equation example expression follows force given gives heat flow Hence hexagonal indicatrix isothermal isotropic lattice left-handed magnetic magnitude matrix notation measured moduli monoclinic number of independent Onsager's Principle optic axis optical activity orientation permittivity perpendicular photoelastic effect piezoelectric effect plane plate point group positive principal axes produced pyroelectric effect quadric quantities radius vector referred refractive index relation representation quadric represents right-handed rotation scalar second-rank tensor set of axes shear shown shows strain stress suffix notation symbol 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