New Ternary Rare-Earth Transition-Metal Antimonides RE3MSb5 (RE = La, Ce, Pr, Nd, Sm; M = Ti, Zr, Hf, Nb)
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Investigations into ternary rare-earth transition-metal antimonide systems RE{sub x}M{sub y}Sb{sub z} have been going on for at least two decades. These studies have been carried out variously to search for new magnetic materials, to test the validity of bonding models, and perhaps most importantly, to systematize an interesting structural chemistry that is not as well understood as that of the corresponding phosphides or arsenides. Some of these antimonides have counterparts in phosphides or arsenides, such as REMSb{sub 2} (M = Mn-Zn, Pd, Ag, Au) with the HfCuSi{sub 2} structure, REM{sub 2}Sb{sub 2} (M = Mn, Ni, Pd) with the CaBe{sub 2}-Ge{sub 2} and ThCr{sub 2}Si{sub 2} structures, and REM{sub 4}Sb{sub 12} (M = Fe, Ru, Os) with the filled skutterudite LaFe{sub 4}P{sub 12} structure. Others, such as RE{sub 3}M{sub 3}Sb{sub 4} (M = Pt, Cu, Au) and REMSb{sub 3} (M = Cr, V) are unique to antimonides so far. The authors report here the synthesis of a new series of ternary-antimonides RE{sub 3}MSb{sub 5} containing an early transition metal M = Ti, Zr, Hf, Nb. 28 refs., 2 figs., 3 tabs.