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

Logvinovich, D.; Aguirre, Myriam H.; Aguiar, R.; Ebbinghaus, Stefan G.; Reller, Armin; Weidenkaff, Anke

doi:10.1016/j.jssc.2008.05.012

Cited by 15 publications

(7 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the lately discovered CaMoO 1.7 N 1.3 an orthorhombic unit cell was found as shown by a splitting of the (110) p diffraction peak (the index p refers to the cubic perovskite unit cell) and the presence of superstructure reflections in the ND data as well as in electron diffraction [66]. Rietveld refinement of the neutron diffraction in space group Pbnm indicated a random O/N distribution on the three distinct crystallographic sites.…”

Section: Neutron Diffractionmentioning

confidence: 94%

“…A revision of the results available in the literature shows that in the great majority of investigations complete statistical O/N distributions or only partial orderings were found. [30]), molybdenum (CaMoO 1.7 N 1.3 [66], SrMo(O,N) 3 [28,37,38]) and tungsten (SrW(O,N) 3 [26]). There seems to be no correlation between the anionic ordering and the crystallographic symmetry since for the above-listed examples cubic ðPm3mÞ, tetragonal ðI4=mcm; I42m; I4Þ, orthorhombic ðPnmaÞ or even triclinic ðI1Þ space groups were found.…”

Section: Neutron Diffractionmentioning

confidence: 99%

See 1 more Smart Citation

Perovskite-related oxynitrides – Recent developments in synthesis, characterisation and investigations of physical properties

Ebbinghaus

Abicht

Dronskowski

et al. 2009

Progress in Solid State Chemistry

314

234

View full text Add to dashboard Cite

Since the first investigations of perovskite type oxynitrides with the generalised composition ABO 3Àx N x about twenty years ago, these compounds have become of growing interest. The incorporation of nitride ions in the perovskite lattice results in distinct changes in the electronic structure leading to unusual physical properties. In this article we report on new synthesis techniques, different analytical methods, progress in the structural characterisation by comprehensive diffraction techniques and local spectroscopic methods like XAS and NMR as well as state of the art theoretical investigations. Various physical characteristics like electrical and thermal transport parameters and dielectric properties are described. The thermal and chemical stability of oxynitride perovskites are investigated and their applications in different photocatalytic reactions are discussed.

show abstract

Section: Neutron Diffractionmentioning

confidence: 94%

Section: Neutron Diffractionmentioning

confidence: 99%

Perovskite-related oxynitrides – Recent developments in synthesis, characterisation and investigations of physical properties

Ebbinghaus

Abicht

Dronskowski

et al. 2009

Progress in Solid State Chemistry

314

234

View full text Add to dashboard Cite

show abstract

“…Previous work has shown that microwave-induced plasma (MIP) treatment is a suitable tool to rapidly synthesise bulk metal oxides and nitrides [12][13][14], providing an alternative to thermal ammonolysis reactions [15,16]. In this work, we report the microwave plasma nitridation of STO single crystals as a function of ammonia gas flow.…”

Section: Introductionmentioning

confidence: 97%

Synthesis and transport properties of SrTiO_3−xN_y/SrTiO_3−δlayered structures produced by microwave-induced plasma nitridation

Shkabko

Aguirre

Marozau

et al. 2009

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

SrTiO 3−x N y /SrTiO 3−δ layered structures were synthesized from single crystals of SrTiO 3 (1 0 0) by ammonolysis using a microwave-induced plasma (MIP). Samples prepared using a low ammonia flow rate (50-100 mL min −1) gave nanocrystals of TiN at the surface, while the samples prepared in an ammonia flow in the range 125-175 mL min −1 did not show impurity phases. Electrical resistance measurements of SrTiO 3−x N y /SrTiO 3−δ single crystals show metallic-like behaviour in the temperature range 2-300 K, with a residual resistance ratio R(300 K)/R(4.2 K) of ca 50. The Hall mobility follows the power law µ H ∝ T −2.3 in the temperature range 150-300 K, which is attributed to n-type charge carriers.

show abstract

“…[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 .…”

Section: Introductionmentioning

confidence: 99%

On the magnetism, thermal- and electrical transport of SrMoO2N

Logvinovich

Hejtmánek

Knı́žek

et al. 2009

Journal of Applied Physics

Self Cite

View full text Add to dashboard Cite

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.

show abstract

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

Cited by 15 publications

References 38 publications

Perovskite-related oxynitrides – Recent developments in synthesis, characterisation and investigations of physical properties

Perovskite-related oxynitrides – Recent developments in synthesis, characterisation and investigations of physical properties

Synthesis and transport properties of SrTiO_3−xN_y/SrTiO_3−δlayered structures produced by microwave-induced plasma nitridation

On the magnetism, thermal- and electrical transport of SrMoO2N

Contact Info

Product

Resources

About

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

Cited by 15 publications

References 38 publications

Perovskite-related oxynitrides – Recent developments in synthesis, characterisation and investigations of physical properties

Perovskite-related oxynitrides – Recent developments in synthesis, characterisation and investigations of physical properties

Synthesis and transport properties of SrTiO3−xNy/SrTiO3−δlayered structures produced by microwave-induced plasma nitridation

On the magnetism, thermal- and electrical transport of SrMoO2N

Contact Info

Product

Resources

About

Synthesis and transport properties of SrTiO_3−xN_y/SrTiO_3−δlayered structures produced by microwave-induced plasma nitridation