(BDTFP)₂X(PhCl)_1/2(X=PF₆�AAsF₆)�͎����Ō݂��Ɍ����\�����������ɂ��ւ�炸�A�ቷ�ł̎��C�I���]�ڂ̗l�q���قȂ�B�ቷ���˃X�y�N�g������ь����\����͂̌��ʂ��瑊�]�ڂ̈Ⴂ�ɂ‚��čl�@����B�܂��A���̌n�̌����͑��]�ڂ������Ȃ����`�����‚��Ƃ��P�����̔��˃X�y�N�g����薾�炩�ƂȂ����B���`�̃X�y�N�g���Ƃ̈Ⴂ�ɂ‚��ĕ񍐂���B

(BDTFP)₂X(PhCl)_1/2(X=PF₆, AsF₆) show different kinds of magnetic phase transition, although they are isostructural with each other. We will discuss the difference of the reflective spectra and crystal structures below the phase transition temperature. These crystals have polymorphism. We will report the reflective spectra of these polymorphic crystals.