Epitaxial nitride films of CrxTi1−xN were grown on MgO (001) by pulsed laser deposition under nitrogen radical irradiation, and their magnetic and transport properties were investigated, which was motivated by calculations on magnetism pointing out similarities of CrN to LaMnO3, the parent compound of colossal magnetoresistance oxides. The films showed ferromagnetism for 0.28⩽x⩽0.5 and the TC showed a maximum (140K) at x=0.5. When x exceeded 0.5(x=0.58) ferromagnetism disappeared completely. At x=0.5, the nitride film showed a large magnetoresistance (6%–7% at 5T), which had a maximum at 130K.

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Two new ternary barium chromium sulfides, BaCr 4 S 7 and Ba 2 Cr 5 S 10 , were synthesized by reactions of barium sulfide, sulfur, and chromium metal under high-pressure and high-temperature conditions. Single crystals of BaCr 4 S 7 were obtained from a starting mixture with a molar ratio of Ba:Cr:S = 2:5:10 after reacting at 1200 C and under a pressure of 5 GPa. It crystallizes in the monoclinic space group P2 1 =c (No. 14) with a ¼ 6:739ð4Þ Å , b ¼ 22:665ð9Þ Å , c ¼ , V ¼ 683:1ð9Þ Å 3 , and Z ¼ 2. The structure is composed of CrS 2 sheets and the wall-shaped subunits, like as in BaCr 4 S 7 , but the subunits do not connect the adjacent CrS 2 sheets. It has a two-dimensional structure, and Ba atoms are situated in interlayer regions.

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Structure Units. -The structures of the new compounds (IV) and (V) are determined by single crystal XRD. (IV) crystallizes in the monoclinic space group P21/c with Z = 4. The structure contains CrS2 sheets composed of edge-sharing CrS6 octahedra. The sheets are connected by wall-shaped subunits composed of face-sharing CrS6 octahedra to form a tunnel structure in which the Ba atoms are situated. Compound (V) crystallizes in the triclinic space group P1 with Z = 2. The structure is composed of CrS2 sheets and the wall--shaped subunits, as in (IV), but the subunits do not connect the adjacent sheets. The compound exhibits a two-dimensional structure, and Ba atoms occupy interlayer regions. -(FUKUOKA*, H.; MIYAKI, Y.; YAMANAKA, S.; Bull. Chem.