Phase Transitions in the Brominated Ferroelectric Tris-Sarcosine Calcium Chloride

We demonstrate that the Curie temperature, Tc, of tris‐sarcosine calcium chloride can be lowered from 130 K to near 0 K by chemical doping of the anion. In the low temperature limit, quantum fluctuations persist over a range of chemical doping concentrations. Below TC the temperature dependence of t...

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Bibliographic Details
Published in:Advanced materials (Weinheim) 2014-06, Vol.26 (23), p.3860-3866
Main Authors: Lashley, J. C., Munns, J. H. D., Echizen, M., Ali, M. N., Rowley, S. E., Scott, J. F.
Format: Article
Language:English
Subjects:
Bromination
Calcium chloride
Curie temperature
Doping
Ferroelectric materials
Fluctuation
Phase transformations
quantum ferroelectric
Rushbrooke inequality
second-order
Temperature dependence
thermal expansion
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Summary:We demonstrate that the Curie temperature, Tc, of tris‐sarcosine calcium chloride can be lowered from 130 K to near 0 K by chemical doping of the anion. In the low temperature limit, quantum fluctuations persist over a range of chemical doping concentrations. Below TC the temperature dependence of the fractional length change, ΔLLo, scales as (ΔLLo)−1=a+a1tλ (red line) where t is the reduced temperature, and λ = ‐1.5. The behavior of linear coefficient of thermal expansion near TC is shown in the inset. Three additional phase transitions near 43, 50, and 61 K are resolved.
ISSN:0935-9648
1521-4095
DOI:10.1002/adma.201305065