Synthesis, structure and properties of the oxynitrides SrWO2N and SrMoO2.5N0.5

On the magnetism, thermal- and electrical transport of SrMoO2N

“…Until now, SrMoO 2.6 N 0.4 and SrMoO 2.5 N 0.5 ͑x = 0.4, 0.5͒ are the only reported powder and thin-film compositions. [10][11][12] The magnetic measurements reveal Pauli paramagnetism ͑ ϳ 10 −4 emu mol −1 Oe −1 ͒ at room temperature and a magnetic transition at T ϳ 54 K. This anomaly is referred to an antiferromagnetic transition 10 or to a spin-glass formation. 11 Recently, we succeeded in preparing CaMoO 1.7 N 1.3 , BaMo͑O,N͒ 3 , 13 and SrMoO 3−x N x ͑x Ͼ 1͒ 14 compounds.…”

“…[10][11][12] The magnetic measurements reveal Pauli paramagnetism ͑ ϳ 10 −4 emu mol −1 Oe −1 ͒ at room temperature and a magnetic transition at T ϳ 54 K. This anomaly is referred to an antiferromagnetic transition 10 or to a spin-glass formation. 11 Recently, we succeeded in preparing CaMoO 1.7 N 1.3 , BaMo͑O,N͒ 3 , 13 and SrMoO 3−x N x ͑x Ͼ 1͒ 14 compounds. Electronic properties of SrMoO 3−x N x ͑x Ͼ 1͒ have been measured at temperatures of 340 K Ͻ T Ͻ 950 K. 14 These novel materials showed low electrical conductivity ͑25-80 S cm −1 ͒ and a positive Seebeck coefficient ͑15-30 V K −1 ͒, a value being about one order of magnitude higher than the reported one for SrMoO 3 .…”

Phase formation, structural and microstructural characterization of novel oxynitride–perovskites synthesized by thermal ammonolysis of (Ca,Ba)MoO4 and (Ca,Ba)MoO3

“…Oxyntrides are normally prepared by thermally activated reactions between ternary oxides like ABO 4 , A 2 B 2 O 7 (A ¼ RE, AE; B ¼ transition element) or oxides-carbonates mixtures (B x O y ÀA n (CO 3 ) m ) with B-site cation in its stable oxidation state and ammonia [4][5][6][7]. Oxide and oxide-carbonate precursors were successfully applied to prepare a number of Ti 4+ , Ta 5+ , Nb 5+ -containing oxynitride-perovskite phases AB(O,N) 3 [7][8][9][10]. The only known molybdenum based oxynitride-perovskite system is SrMoO 3Àx N x [9,11,12].…”

“…Oxide and oxide-carbonate precursors were successfully applied to prepare a number of Ti 4+ , Ta 5+ , Nb 5+ -containing oxynitride-perovskite phases AB(O,N) 3 [7][8][9][10]. The only known molybdenum based oxynitride-perovskite system is SrMoO 3Àx N x [9,11,12]. It was prepared by thermal ammonolysis of SrMoO 4 with Mo in its air-stable formal oxidation state +6, at T ¼ 1023 À1073 K. In SrMoO 3Àx N x the formal oxidation state of molybdenum varies between +4 and +6 depending on the anionic composition.…”

Structural and electronic structures of alkaline-earth transition metal oxynitride perovskites

“…35),36) SrWO 2 N displays magnetic properties 37) and EuNbO 2 N and EuWO 2 N show colossal magnetoresistance and ferromagnetic properties. 22), 38) YSiO 2 N and YGeO 2 N are piezoelectric materials. 39) Finally, the recent report of NdVO 2 N demonstrates also the possibility of obtaining stable perovskite oxynitride metallic phases with d n configurations.…”