The coordination atom of the first coordination shell of La in REE-BPS was oxygen whose coordination number was 6 and the average distance among the atoms was 2.52 , and the second shell was sulfur that were 3 and 2.91 respectively.

• REE-BPS中La原子的第一配位层是六配位的氧原子；平均键长距离2.；52A; 第二配位层是三配位的硫原子；平均距离2