Abstract
Tris-sarcosine calcium chloride, (CH 3 NHCH 2 COOH) 3 ·CaCl 2 , is ferroelectric below the Curie point, 127°K, where the dielectric constant, e b , at low frequencies shows a sharp peak. The dielectric constants e a and e c . do not show any noticeable anomaly at the Curie point. The dielectric measurement at a microwave frequency of 9.4 Gc/s indicates that there is a marked dielectric dispersion in the Curie temperature region. The spontaneous polarization is 0.27 µCoul/cm 2 at 78°K. The high-temperature phase is orthorhombic with space group P n m a and a =9.153 A, b =17.48 A, c =10.28 A at room temperature. The low-temperature phase may possibly be orthorhombic with point group C 2 v . The measurement of specific heat as a function of temperature yields δ S =(0.38±0.04) cal/mole·degree. The results are discussed in comparison with those of some ferroelectrics such as (glycine) 3 ·H 2 SO 4 .
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