= 0.754 at 546 nm together with wide band gaps exceeding 3.20 eV (3.50 and 3.53 eV, respectively). Structural fingerprint and response electron distribution anisotropy analyses establish a comprehensive structure-property relationship for linear-module-dominant systems, revealing that coaxiality, rather than conventional coplanarity, constitutes the decisive structural criterion for constructing next-generation birefringent crystals based on linear functional modules.
Jin et al. (Mon,) studied this question.