Abstract
This work reports experimental results obtained from series of measurements ofpyroelectric currents in samples of strontium calcium titanate (SCT)corresponding to contents of Ca of x = 0.002, x = 0.005 and x = 0.011.Sequences of zero field cooling (zfc), field heating (fh), field cooling (fc)and zero field heating (zfh) runs, under different applied electric fields,allowed the observation of the temperature and field dependence of theelectric polarization under different initial conditions. The results show theexistence of a weak non-ergodic regime in the compositions x = 0.005 andx = 0.011 and allow the tracing of the corresponding Almeida-Thouless line inthe T-E diagram. For the three compositions investigated, a small zerofield polarization is detected and interpreted as due to defect inducedinternal fields.
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