1983 Volume 52 Issue 1 Pages 207-214
Specific heat data are reported, 1.7–30 K, on four samples of PbTiO3: amorphous ribbon (∼20 vm thick); crystallized ribbon (∼1 μm grain size); crystalline powder (∼1 μm grain size); and ceramic pellet (∼2 μm grain size). Both the amorphous and crystallized ribbon samples display strong Schottky behavior below 4 K with nearly identical (two level) energy separations ≅78 mK. PbO loss from the thin ribbons is postulated to explain these effects. Below 3 K, the powder and pellet samples display a glasslike linear term in the specific heat, and the coefficients of these terms (1.4×10−5 J cm−3K−2) are the same magnitude as those found in glasses. All crystalline forms of PbTiO3 display maxima in C⁄T3 at 15 K, and these maxima are accurately represented by single Einstein terms with frequencies 47–52 cm−1. Amorphous PbTiO3 displays a C⁄T3 maximum at 10 K, as does vitreous SiO2. A Debye temperature for crystalline PbTiO3 of 337 K is reported; the effective Debye temperature for amorphous PbTiO3 is found to be 256 K.
This article cannot obtain the latest cited-by information.