On the electrical properties of the perovskites LnWOxN3−x

Antoine, P.; Marchand, R.; Laurent, Y.; Michel, C.; Raveau, B.

doi:10.1016/0025-5408(88)90049-9

Cited by 45 publications

(14 citation statements)

References 2 publications

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“…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].…”

Section: Introductionmentioning

confidence: 99%

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

Logvinovich

Aguirre

Aguiar

et al. 2008

Journal of Solid State Chemistry

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Section: Introductionmentioning

confidence: 99%

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

Logvinovich

Aguirre

Aguiar

et al. 2008

Journal of Solid State Chemistry

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“…3,6,7 Cubic perovskite SrMoO 3 ͑d 2 ͒ exhibits high charge carrier density and optical transparency in the ultraviolet region. 8,9 Therefore, this transparent oxide is a potential candidate for diverse applications, including solar cells.…”

Section: Introductionmentioning

confidence: 99%

On the magnetism, thermal- and electrical transport of SrMoO2N

Logvinovich

Hejtmánek

Knı́žek

et al. 2009

Journal of Applied Physics

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Physical properties of perovskite-type SrMoO2N phases were studied in the temperature range of 3 K<T<300 K. The oxynitride crystallizes in a cubic unit cell (space group Pm3¯m) as revealed by neutron and x-ray diffraction measurements. The polycrystalline material shows weakly temperature dependent electrical resistivity and low glasslike heat conductivity, both reflecting the unusual strength of the scattering processes in the charge carrier transport. Based on the positive Seebeck coefficient values, holes are identified as the dominating charge carriers in SrMoO2N. Down to 150 K, the magnetic susceptibility is temperature independent and explained as enhanced Pauli paramagnetism (χ∼10−4 emu mol−1 Oe−1). The absolute value of its magnetic susceptibility is, however, half of that for SrMoO3. Simultaneously, the lower Sommerfeld coefficient γ measured for the oxynitride confirms the lower density of states near the Fermi level for SrMoO2N compared to SrMoO3. At low temperature, both SrMoO2N and SrMoO3 show Curie paramagnetism superimposed to the temperature independent Pauli paramagnetism and an anomaly at T=54 K. This anomaly is attributed to the presence of molecular oxygen in the material, while the Curie upturn is likely associated with a small amount of paramagnetic centers.

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“…Attempts to synthesize La-and Ce-containing analogous scheelite-type oxynitrides were unsuccessfull. In the case of lanthanum, only the perovskite phase LaW(O,N) 3 was observed [12,13], while in the case of cerium, oxidation of Ce III into Ce IV , which occurs during the citrate process, prevented synthesis of the Ce 2 W 2 O 9 oxide precursor.…”

Section: Ndwo 3 N and Prwo 3 Nmentioning

confidence: 99%

New scheelite-type oxynitrides in systems RWO3N?AWO4 (R = rare-earth element; A = Ca, Sr) from precursors obtained by the citrate route

Cheviré

2004

Materials Research Bulletin

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RWO 3 N oxynitrides were isolated as single phases for R = Nd and Pr, after thermal ammonolysis of reactive precursors prepared using the citrate complexation/calcination route. Both stoichiometric compounds crystallize with a scheelite-type tetragonal unit cell, with a = 5.2821(3) Å, c = 11.5893(8) Å (NdWO 3 N) and a = 5.299(3) Å, c = 11.631(9) Å (PrWO 3 N). Neutron diffraction experiments performed on the Nd-phase did not evidence any oxygen/nitrogen order within the scheelite anionic subnetwork (S.G. I4 1 /a). (Nd,A)W(O,N) 4 (A = Ca, Sr) solid solution domains were identified between NdWO 3 N and the AWO 4 oxide composition.

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On the electrical properties of the perovskites LnWOxN3−x

Cited by 45 publications

References 2 publications

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

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

On the magnetism, thermal- and electrical transport of SrMoO2N

New scheelite-type oxynitrides in systems RWO3N?AWO4 (R = rare-earth element; A = Ca, Sr) from precursors obtained by the citrate route

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