Microwave Losses in Strontium Titanate above the Phase Transition

Raman scattering spectra of ceramics, films, and superlattices of ferroelectric perovskites: A review

“…It is known [21,22] that, in ceramics, as well as in crystals, there is no appreciable dispersion of the dielectric susceptibility at low temperatures and at frequencies of up to 10 10 Hz. The dielectric susceptibility of the ceramic samples at liquid helium temperatures reaches a few thousands, which is several times less than that in good single crystals, where this quantity can be as large as 25000 [23,24].…”

Ferroelectric-like response from the surface of SrTiO3 crystals at high temperatures

“…2,7 Therefore, the bulk and surface properties of SrTiO 3 have attracted considerable attention in contemporary condensed matter physics. SrTiO 3 crystallizes in the cubic perovskite structure in its paraelectric phase and is known to lead to a cubic to antiferrodistortive phase transition at 105 K. [8][9][10] From first principle calculations, it was inferred that SrTiO 3 might possibly have a low temperature (40 K) ferroelectric phase under hydrostatic pressure or strain. 11 More recently, ab initio calculations have revealed that a ferroelectric soft phonon mode in SrTiO 3 might lead to a giant piezo-electric response in the system.…”

Central peak in the strontium titanate crystal near the tetragonal-to-cubic phase transition

“…Permittivity anomalies are absent during this phase transition [11]; however, anomalies in the temperature dependences of the specific heat [12], elastic constants [13,14], and speed of sound [15] are observed.…”