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Permittivity of Strontium Titanate

Neville, R. C. and Hoeneisen, B. and Mead, C. A. (1972) Permittivity of Strontium Titanate. Journal of Applied Physics, 43 (5). pp. 2124-2131. ISSN 0021-8979. doi:10.1063/1.1661463.

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The permittivity of single‐crystal single‐domain strontiumtitanate has been measured in detail in the [001], [011], and [111] directions, as a function of temperature (from 4.2 to 300 °K), electric field (from −23 000 to +23 000 V/cm, and frequency (from 1 kHz to 50 MHz). The free energy of the crystal is determined as a function of polarization with temperature as a parameter. The Curie‐Weiss law is satisfied in the temperature range 60–300 °K, giving a Curie temperature of 30 ± 2 °K for the three crystal orientations. The Lyddane‐Sachs‐Teller (LST) relation is satisfied for temperatures between 30 and 300 °K and for electric fields between 0 and 12 000 V/cm. A generalized LST relation is used to calculate the permittivity of strontiumtitanate from zero to optic frequencies. Two active optic modes are important. The lower‐frequency mode is attributed mainly to motion of the strontium ions with respect to the rest of the lattice, while the higher‐frequency active mode is attributed to motion of the titanium ions with respect to the oxygen lattice. The restoring forces that act on the Ti ions begin to "harden" when these ions are displaced approximately 0.002 Å from their equilibrium positions.

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Additional Information:© 1972 The American Institute of Physics. Received 25 October 1971. One of us (R.C.N.) received financial support from the National Science Foundation during the course of this work. Dr. Arthur Chodos performed the electron microprobe analysis.
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Issue or Number:5
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ID Code:52908
Deposited On:17 Dec 2014 04:06
Last Modified:10 Nov 2021 19:45

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