The temperature-dependent,second-order,nonlinear,optical coefficient(x^((2))).piezoelectric coefficient (d_(33)),pyroelectric coefficient(Ps) and domains on triglycine sulfate(TGS) reported herein provid...The temperature-dependent,second-order,nonlinear,optical coefficient(x^((2))).piezoelectric coefficient (d_(33)),pyroelectric coefficient(Ps) and domains on triglycine sulfate(TGS) reported herein provide a clue for us to investigate these as a typical second-order phase transition.The symmetry breaking occurrence is definitely confirmed by the temperature-dependent x^((2)) in which x^((2)) displays a limited value at the ferroelectric phase,indicating the space group(P2_1) chosen is correct,and when x^((2)) basically maintains a zero value at the paraelectric phase,indicating the space group should be centric.Interestingly,after normalization of x^((2)),d_(33) or Ps,the change trend with temperature is basically overlapped,probably abiding by Landau theory.Moreover,temperature-dependent domains directly show the symmetry breaking occurrence.展开更多
基金supported by NSFC(Nos.21290172,20931002 and 21111140013)
文摘The temperature-dependent,second-order,nonlinear,optical coefficient(x^((2))).piezoelectric coefficient (d_(33)),pyroelectric coefficient(Ps) and domains on triglycine sulfate(TGS) reported herein provide a clue for us to investigate these as a typical second-order phase transition.The symmetry breaking occurrence is definitely confirmed by the temperature-dependent x^((2)) in which x^((2)) displays a limited value at the ferroelectric phase,indicating the space group(P2_1) chosen is correct,and when x^((2)) basically maintains a zero value at the paraelectric phase,indicating the space group should be centric.Interestingly,after normalization of x^((2)),d_(33) or Ps,the change trend with temperature is basically overlapped,probably abiding by Landau theory.Moreover,temperature-dependent domains directly show the symmetry breaking occurrence.