## Course of theoretical physics: Electrodynemics of continuous media |

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Page 77

For this reason the change in direction of the spontaneous

requires only a slight reconstruction of the lattice and can occur quite easily. The

actual nature of the ferroelectric properties of a body depends on its crystal

symmetry ...

For this reason the change in direction of the spontaneous

**polarization**hererequires only a slight reconstruction of the lattice and can occur quite easily. The

actual nature of the ferroelectric properties of a body depends on its crystal

symmetry ...

Page 81

If we are not interested in the details of the structure, and consider portions of the

body which are large compared with the domains, we can use the

averaged over such portions. Its component P, can evidently take values in the ...

If we are not interested in the details of the structure, and consider portions of the

body which are large compared with the domains, we can use the

**polarization**Paveraged over such portions. Its component P, can evidently take values in the ...

Page 83

We see that the two coefficients behave entirely differently: whereas )1" ' is a finite

constant, pm increases without limit as the transition point is approached.'r In the

pyroelectric phase, formula (19.22) shows that the spontaneous

We see that the two coefficients behave entirely differently: whereas )1" ' is a finite

constant, pm increases without limit as the transition point is approached.'r In the

pyroelectric phase, formula (19.22) shows that the spontaneous

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angle anisotropy anisotropy energy antiferromagnetic atoms axes axis body boundary conditions calculation charge circuit coefﬁcient coefficients components conductor constant coordinates corresponding cross-section crystal Curie point curl H deﬁned deﬁnition denote dependence derivatives determined dielectric diffraction direction discontinuity dissipation domains electric ﬁeld electromagnetic ﬁeld electrons ellipsoid energy ﬂux expression external ﬁeld external magnetic ﬁeld ferroelectric ferromagnet ﬁeld H ﬁnd ﬁnite ﬁrst ﬁrst term ﬂow ﬂuctuations ﬂuid formula free energy frequency function given gives grad Hence incident induction inﬁnite integral isotropic Landau theory layer linear magnetic ﬁeld magnetohydrodynamics magnetostriction magnitude medium normal obtain optical particle permittivity perpendicular perturbation phase plane polarization PROBLEM propagated properties pyroelectric quantities reﬂection refraction relation respect result rotation satisﬁed scattering shock wave signiﬁcance solution sphere superconducting surface symmetry tangential temperature tensor theory thermodynamic potential transition uniaxial upper half-plane values variable velocity volume wave vector z-axis zero