Dipole Glassy State in Layered Mixed Crystals of Cu(In,Cr)P₂(S,Se)₆System

Abstract Layered Cu(Cr x In 1 − x )P 2 S 6 mixed crystals have been studied by measuring the complex dielectric permittivity along polar axis in the frequency range 100 Hz – 16 MHz. It has been found that for 0.8 ≤ x ≤ 1.0 the line of the phase transitions into the antiferroelectric phase on the phase diagram occurs. On other side of the phase diagram at 0.2 ≤ x ≤ 0.3 the long range ferroelectric order coexisting with relaxation glassy-like behavior is observed. In the intermediate concentration range for 0.4 ≤ x ≤ 0.6 the state can be identified dipole glassy-like state. The dipole glass also coexists with the ferroelectric state in CuInP 2 (Se x S 1 − x ) 6 mixed crystals when x → 0. With an increase in selenium content the dipole glass transforms into a ferroelectric state via relaxor ordering regime. Keywords: CuInP2(SexS1 −x )6 Cu(CrxIn1 − x)P2S6 ferroelectricsantiferroelectricsdielectric propertiesdipole glassPACS numbers: 77.84–s64.70.–p63.20.-e