Synthesis and Characterization of Oxynitrides in the ZrO2-Rich Part of the Systems Ca–Zr–O–N and Mg–Zr–O–N

Lerch, Martin; Lerch, J.; Hock, Rainer; Wrba, J.

doi:10.1006/jssc.1996.7222

Cited by 26 publications

(19 citation statements)

References 13 publications

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“…For example, they are in the focus of recent studies testing their suitability as photocatalysts for water splitting under sunlight [1][2][3]. Ionic conductivity studies focusing on the behavior of N 3À anions have yielded promising results indicating the possibility of N 3À ion conducting materials [4][5][6]. The substitution of cadmium sulfoselenide pigments by nontoxic tantalum oxynitrides is an issue with great environmental benefits [7,8].…”

Section: Introductionmentioning

confidence: 99%

A new anatase-type phase in the system Mg–Ta–O–N

Schilling

Lerch

Börger

et al. 2006

Journal of Solid State Chemistry

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Magnesium doped tantalum oxynitrides were prepared by ammonolysis of amorphous mixed oxides. An orange colored anatase-type phase with the composition Mg 0.05 Ta 0.95 O 1.15 N 0.85 was found. It is metastable and undergoes a phase transformation to a baddeleyitetype phase between 900 and 1000 1C. X-ray diffraction measurements indicate spacegroup I4 1 /amd with lattice parameters a ¼ 391:986ð6Þ pm and c ¼ 1011:19ð3Þ pm. A possible anion ordering was examined by theoretical methods and neutron diffraction experiments. In addition, anosovite-type (Ti 3 O 5 ) phases Mg x Ta 3Àx O 3x N 5À3x ; 0pxp0.3 were obtained. The electronic spectra of all phases were investigated by UV/vis spectroscopy. r

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Section: Introductionmentioning

confidence: 99%

A new anatase-type phase in the system Mg–Ta–O–N

Schilling

Lerch

Börger

et al. 2006

Journal of Solid State Chemistry

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“…The maximal amount of incorporated nitrogen presented here for single crystals (see Fig. 1) is the same as found for ceramics [4,6]. The homogeneity of the crystals was verified by secondary ion mass spectrometry (SIMS), micro x-ray fluorescence spectroscopy (µ-XRF), and neutron diffraction [8,9,14,15].…”

Section: Resultsmentioning

confidence: 99%

“…During the last ten years, an alternative route of vacancy formation has attracted more and more attention: the incorporation of nitrogen into the anion sub lattice [1][2][3][4][5]. Dependent on the kind of cationic dopant and the ratio dopant cation / nitrogen, phases with randomly distributed (Y 2 O 3 or CaO) or ordered (MgO or Sc 2 O 3 ) anion vacancies are observed [4,6,7]. While the ordered phases are of great interest in crystal chemistry because of their complex ordering schemes, yttria-and calcia-doped materials are, to our knowledge, the first examples of solids with a high mobility of nitrogen anions, as shown recently by tracer diffusion experiments [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Nitrogen‐doped zirconia single crystals

Rödel¹,

Wang

Lerch

et al. 2006

Cryst. Res. Technol.

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The aim of this work is the preparation of nitrogen-doped single crystals of cation-stabilized zirconia. Thin plates of these crystals were nitrided in a graphite heated resistance furnace with nitrogen as reaction gas. Several dwell times and reaction temperatures were tested and their effect on the amount of incorporated nitrogen is investigated. During nitridation at high temperatures a rock salt-type 'ZrN' layer grows on the surface, leading to the destruction of the crystal. In contrast to the fluorite-type bulk material, which can be described as a fast anion conductor, the surface layer shows electronic conductivity. For possible applications of the bulk material (solid electrolyte) the formation of the surface layer must be avoided. Therefore, the interface between surface epilayer and bulk material was investigated in detail by electron microscopy methods.

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“…The volume flow rate of NH 3 was 7 L/h and of O 2 0.03 L/h. It should be mentioned that possible applications of tantalum oxide nitrides are fast ion conductors [48], the usage as nontoxic color pigments [49] or as anodematerials for photocatalytical water splitting under sunlight [50]. Our optical measurements on the phase pure samples gave an indirect optical band gap of 2.03 eV and a direct band gap of 2.59 eV, respectively [51].…”

Section: Vo 2 (B)-type γ-Taonmentioning

confidence: 96%

Synthesis and characterization of metastable transition metal oxides and oxide nitrides

Lüdtke

Weber

Schmidt

et al. 2016

Zeitschrift Für Kristallographie - Crystalline Materials

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New routes to vanadium sesquioxide and tantalum oxide nitride (γ-and δ-phase) are presented. Phase pure V 2 O 3 with bixbyite-type structure, a metastable polymorph, was obtained from vanadium fluoride hydrates at ~750 K. It crystallizes in the cubic crystal system in space group Ia3 ̅ with lattice parameter a = 939.30(5) pm. The catalytical properties of the corresponding oxide nitride phases and their oxidation and reduction solid-state kinetics were investigated. The preparation of γ-TaON as a phase pure sample can be realized by ammonolysis of X-ray amorphous tantalum oxide precursors at 1073 K. This metastable tantalum oxide nitride crystallizes in the monoclinic VO 2 (B)-type structure in space group C2/m. The same precursors can be used to synthesize the δ-modification with an anatase-type structure at 1023 K. It crystallizes in the tetragonal crystal system in space group I4 1 /amd. A maximum yield of 82 m % could be obtained. The fundamental band gaps of the synthesized and of other metastable TaON polymorphs were calculated from first principles using the GW method. The present results are compared to experimental data and to previous calculations at hybrid DFT level.

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Synthesis and Characterization of Oxynitrides in the ZrO2-Rich Part of the Systems Ca–Zr–O–N and Mg–Zr–O–N

Cited by 26 publications

References 13 publications

A new anatase-type phase in the system Mg–Ta–O–N

A new anatase-type phase in the system Mg–Ta–O–N

Nitrogen‐doped zirconia single crystals

Synthesis and characterization of metastable transition metal oxides and oxide nitrides

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