A new conducting ternary nitride: NaxTa3N5 (0<=x<=1.4)
Topotactic insertion of sodium into the channel structure of Ta3N5has been accomplished by the reaction between Na and Ta3N5at temperatures between 450 and 600°C in sealed Ni tubes. The limiting stoichiometry of NaxTa3N5obtained isx≈1.4. The structure of Na1.0Ta3N5has been refined using Rietveld ful...
| Main Authors: | , |
|---|---|
| Format: | Journal article |
| Language: | English |
| Published: |
1997
|
| _version_ | 1797050800631971840 |
|---|---|
| author | Clarke, S DiSalvo, F |
| author_facet | Clarke, S DiSalvo, F |
| author_sort | Clarke, S |
| collection | OXFORD |
| description | Topotactic insertion of sodium into the channel structure of Ta3N5has been accomplished by the reaction between Na and Ta3N5at temperatures between 450 and 600°C in sealed Ni tubes. The limiting stoichiometry of NaxTa3N5obtained isx≈1.4. The structure of Na1.0Ta3N5has been refined using Rietveld full-profile refinement of X-ray powder diffraction data using the Ta3N5structure as the starting model. The space group remainsCmcm(No. 63) with parametersa=3.995(1),b=10.197(2), andc=10.331(2) Å. The Na atoms are shown to occupy 7-coordinate sites in the holes present in the Ta3N5framework. The weak temperature dependence of the magnetic susceptibility between 100 and 320 K of Na1.0Ta3N5and its small value (χmol(300 K)=6.5×10-4emu mol-1) suggest that the compound is a metallic conductor. This is supported by the moderate conduction of an unsintered pellet of Na1.0Ta3N5powder. We also report the identification of the poorly crystalline disordered rock salt phase Na2Ta3N5(a=4.47(4) Å) which is obtained when the reaction temperature is between 600 and 800°C and a partly characterized hexagonal phase that results from nitrogen loss, Na1-xTa3+xN4(x≈0), which forms at temperatures above 800°C. The latter compound crystallizes inP63/mcm(No. 193) witha=5.1784(1) andc=10.3650(3) Å and is analogous to previously reported Li and Mg compounds. © 1997 Academic Press. |
| first_indexed | 2024-03-06T18:10:34Z |
| format | Journal article |
| id | oxford-uuid:02e13cbd-eabb-48f4-b183-fdee0eaa2ce6 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T18:10:34Z |
| publishDate | 1997 |
| record_format | dspace |
| spelling | oxford-uuid:02e13cbd-eabb-48f4-b183-fdee0eaa2ce62022-03-26T08:43:09ZA new conducting ternary nitride: NaxTa3N5 (0<=x<=1.4)Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:02e13cbd-eabb-48f4-b183-fdee0eaa2ce6EnglishSymplectic Elements at Oxford1997Clarke, SDiSalvo, FTopotactic insertion of sodium into the channel structure of Ta3N5has been accomplished by the reaction between Na and Ta3N5at temperatures between 450 and 600°C in sealed Ni tubes. The limiting stoichiometry of NaxTa3N5obtained isx≈1.4. The structure of Na1.0Ta3N5has been refined using Rietveld full-profile refinement of X-ray powder diffraction data using the Ta3N5structure as the starting model. The space group remainsCmcm(No. 63) with parametersa=3.995(1),b=10.197(2), andc=10.331(2) Å. The Na atoms are shown to occupy 7-coordinate sites in the holes present in the Ta3N5framework. The weak temperature dependence of the magnetic susceptibility between 100 and 320 K of Na1.0Ta3N5and its small value (χmol(300 K)=6.5×10-4emu mol-1) suggest that the compound is a metallic conductor. This is supported by the moderate conduction of an unsintered pellet of Na1.0Ta3N5powder. We also report the identification of the poorly crystalline disordered rock salt phase Na2Ta3N5(a=4.47(4) Å) which is obtained when the reaction temperature is between 600 and 800°C and a partly characterized hexagonal phase that results from nitrogen loss, Na1-xTa3+xN4(x≈0), which forms at temperatures above 800°C. The latter compound crystallizes inP63/mcm(No. 193) witha=5.1784(1) andc=10.3650(3) Å and is analogous to previously reported Li and Mg compounds. © 1997 Academic Press. |
| spellingShingle | Clarke, S DiSalvo, F A new conducting ternary nitride: NaxTa3N5 (0<=x<=1.4) |
| title | A new conducting ternary nitride: NaxTa3N5 (0<=x<=1.4) |
| title_full | A new conducting ternary nitride: NaxTa3N5 (0<=x<=1.4) |
| title_fullStr | A new conducting ternary nitride: NaxTa3N5 (0<=x<=1.4) |
| title_full_unstemmed | A new conducting ternary nitride: NaxTa3N5 (0<=x<=1.4) |
| title_short | A new conducting ternary nitride: NaxTa3N5 (0<=x<=1.4) |
| title_sort | new conducting ternary nitride naxta3n5 0 lt x lt 1 4 |
| work_keys_str_mv | AT clarkes anewconductingternarynitridenaxta3n50ltxlt14 AT disalvof anewconductingternarynitridenaxta3n50ltxlt14 AT clarkes newconductingternarynitridenaxta3n50ltxlt14 AT disalvof newconductingternarynitridenaxta3n50ltxlt14 |