Thirteen new compounds were synthesized. They are supposed to crystallize with the CaAl 2 Si 2 type of structure (space group P3̅m1) with the following constants: SrZn 2 P 2 a = 410.0(0) pm, c = 710.1(1) pm, SrCd 2 P 2 a = 433.8(0) pm, c = 726.9(1) pm, BaCd 2 P 2 a = 440.2(0) pm, c = 755.7(1) pm, BaCd 2 As 2 a = 451.6(0) pm, c = 769.3(1) pm, BaMg 2 P 2 a = 436.7(1) pm, c = 758.0(3) pm, EuZn 2 P 2 a = 408.7(1) pm, c = 701.0(1) pm, EuZn 2 As 2 a = 421.1(1) pm, c = 718.1(1) pm, EuZn 2 Sb 2 a = 448.9(1) pm, c = 760.9(1) pm, YbZn 2 As 2 a = 416.0(1) pm, c = 696.1(1) pm, YbZn 2 Sb 2 a = 444.4(1) pm, c = 742.4(1) pm, LuZnCuAs 2 a = 407.1(1) pm, c = 663.4(1) pm, YZnCuP 2 a = 398.3(1) pm, c = 652.3(1) pm, YZnCuAs 2 a = 410.4(1) pm, c = 669.2(1)pm.
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Klüfers et al. (1980) studied this question.