LAUSR

Abstract We developed a non-contact and non-destructive method to detect Curie point ( T C ) in Er 3+ doped Ba 0.77 Ca 0.23 TiO 3 (BCT) ferroelectric ceramic. Through investigating the photoluminescence (PL) spectra of Er 3+ doped BCT ceramic we found that PL characteristics in ferroelectrics demonstrates critical behavior around T C . Both intensity and peak positions of the Stark sub-peaks originating from 4 S 3/2 to 4 I 15/2 transition change dramatically, and can be fitted with two different lines below and above T C . The inflection points of the PL characteristics are at the same temperature of 381(1) K, and coincident with the T C (381 K) determined by the dielectric temperature spectrum.