Ferroelectricity: The Fundamentals Collection by Julio A. Gonzalo, Basilio Jimenez

By Julio A. Gonzalo, Basilio Jimenez

This crucial number of seminal papers on ferroelectricity offers an summary over virtually 100 years of easy and utilized examine. Containing old contributions from popular authors, this booklet offers advancements in a space of technological know-how that remains quickly transforming into. even though basically geared toward scientists and lecturers considering examine, this may even be of use to scholars in addition to rookies to the sector.

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24) and (25) and solving for the time variable parts of the polarization, P O ,noting that E +BJ's - ( N -N*) ~ c & ( ~ ) Y ] , ~-PIY (57) kT we find for the dielectric constant as a function of frequency, the equation 4rA 2 cosh(APs/Np) +1 e, = co x( 2+cosh(APs/Np) _ +-- 2 cosh(APs/Np)+l 2 +cosh(A P a / N p ) ______ . 2+cosh(APs/Np) )+( cosh(APs/NF) -eAU (59) Ik f When the last term in the denominator equals the sum of the other two, the dipole dielectric constant has equal resistance and reactance values and the corresponding frequency is the relaxation frequency.

1041 transition temperatures. Rochelle salt bccomes norinal again at still lower temperatures, and barium titanate has two lower transition tenipratures at which there are further changes of crystal form. The crystal changes are always small, the shears involved being usually less than a degree. There are also small specific heat changes at the trailsition temperature. In this paper we shall consider only the most recently discovered poup of ferroelectrics, the third, and in particular barium titanate.

Mason, B. T. Matthias 1634 W. P. MASON A N D B. T . M A T T H I A S I 39 will cause the polarization to increase from 35,600 stat coulombs/cm* to 41,500 stat coulombs, an increase of 16 percent. This agrees quite well with the increase measured by HulmO who found an increase of about 13 percent for this case. If we put on a negative voltage along the axis the ratio P J N p will decrease steadily until the difference between the left hand side of Eq. (69) and PJNp reaches a maximum. /cm = 22,200 volts/cm.

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