Oxynitride perovskites: Synthesis and structures of LaZrO2N, NdTiO2N, and LaTiO2N and comparison with oxide perovskites
A new oxynitride, LaZrQ2N, has been synthesized by the reaction of a highly reactive X-ray amorphous La2Zr2O7 precursor with flowing ammonia at between 900 and 1000 °C. The white insulating material crystallizes in the GdFeQ3 distorted perovskite structure type with orthorbombic space group Pnma and...
| Main Authors: | , , , , |
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| Format: | Journal article |
| Language: | English |
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2002
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| _version_ | 1797080830241144832 |
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| author | Clarke, S Guinot, B Michie, C Calmont, M Rosseinsky, M |
| author_facet | Clarke, S Guinot, B Michie, C Calmont, M Rosseinsky, M |
| author_sort | Clarke, S |
| collection | OXFORD |
| description | A new oxynitride, LaZrQ2N, has been synthesized by the reaction of a highly reactive X-ray amorphous La2Zr2O7 precursor with flowing ammonia at between 900 and 1000 °C. The white insulating material crystallizes in the GdFeQ3 distorted perovskite structure type with orthorbombic space group Pnma and with a = 5.875 25(5) Å, b = 8.250 31(7) Å, c = 5.810 08(5) Å, and Z = 4, as determined by neutron powder diffraction. A detailed structural analysis of the isostructural NdTiO2N is also reported: Pnma, a = 5.5492(1) Å, b = 7.8017-(1) Å, c = 5.529 01(9) Å, and Z = 4. LaTiO2N crystallizes in a different distorted perovskite structure, which is triclinic, and consequently has two distinct Ti(04N2) octahedra (LaTiO2N: I1, a = 5.6097(1) Å, b = 7.8719(2) Å, c = 5.5752(1) Å, α = 90.199(2)°, β 90.199(2)°, β = 90.154-(3)°, γ = 89.988(8)°, Z = 4). Oxide and nitride ions are completely disordered in all three phases. The M(O,N)6 octahedra (M = Ti, Zr) in these phases and a number of perovskite titanates and zirconates become more regular as the tilting distortion of the octahedral framework becomes more pronounced, as a result of quenching of the second-order Jahn-Teller distortion of the octahedra. |
| first_indexed | 2024-03-07T01:05:50Z |
| format | Journal article |
| id | oxford-uuid:8b4ce9f1-fa0f-4a52-9b4f-49bdfb080e32 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T01:05:50Z |
| publishDate | 2002 |
| record_format | dspace |
| spelling | oxford-uuid:8b4ce9f1-fa0f-4a52-9b4f-49bdfb080e322022-03-26T22:37:14ZOxynitride perovskites: Synthesis and structures of LaZrO2N, NdTiO2N, and LaTiO2N and comparison with oxide perovskitesJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:8b4ce9f1-fa0f-4a52-9b4f-49bdfb080e32EnglishSymplectic Elements at Oxford2002Clarke, SGuinot, BMichie, CCalmont, MRosseinsky, MA new oxynitride, LaZrQ2N, has been synthesized by the reaction of a highly reactive X-ray amorphous La2Zr2O7 precursor with flowing ammonia at between 900 and 1000 °C. The white insulating material crystallizes in the GdFeQ3 distorted perovskite structure type with orthorbombic space group Pnma and with a = 5.875 25(5) Å, b = 8.250 31(7) Å, c = 5.810 08(5) Å, and Z = 4, as determined by neutron powder diffraction. A detailed structural analysis of the isostructural NdTiO2N is also reported: Pnma, a = 5.5492(1) Å, b = 7.8017-(1) Å, c = 5.529 01(9) Å, and Z = 4. LaTiO2N crystallizes in a different distorted perovskite structure, which is triclinic, and consequently has two distinct Ti(04N2) octahedra (LaTiO2N: I1, a = 5.6097(1) Å, b = 7.8719(2) Å, c = 5.5752(1) Å, α = 90.199(2)°, β 90.199(2)°, β = 90.154-(3)°, γ = 89.988(8)°, Z = 4). Oxide and nitride ions are completely disordered in all three phases. The M(O,N)6 octahedra (M = Ti, Zr) in these phases and a number of perovskite titanates and zirconates become more regular as the tilting distortion of the octahedral framework becomes more pronounced, as a result of quenching of the second-order Jahn-Teller distortion of the octahedra. |
| spellingShingle | Clarke, S Guinot, B Michie, C Calmont, M Rosseinsky, M Oxynitride perovskites: Synthesis and structures of LaZrO2N, NdTiO2N, and LaTiO2N and comparison with oxide perovskites |
| title | Oxynitride perovskites: Synthesis and structures of LaZrO2N, NdTiO2N, and LaTiO2N and comparison with oxide perovskites |
| title_full | Oxynitride perovskites: Synthesis and structures of LaZrO2N, NdTiO2N, and LaTiO2N and comparison with oxide perovskites |
| title_fullStr | Oxynitride perovskites: Synthesis and structures of LaZrO2N, NdTiO2N, and LaTiO2N and comparison with oxide perovskites |
| title_full_unstemmed | Oxynitride perovskites: Synthesis and structures of LaZrO2N, NdTiO2N, and LaTiO2N and comparison with oxide perovskites |
| title_short | Oxynitride perovskites: Synthesis and structures of LaZrO2N, NdTiO2N, and LaTiO2N and comparison with oxide perovskites |
| title_sort | oxynitride perovskites synthesis and structures of lazro2n ndtio2n and latio2n and comparison with oxide perovskites |
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