Perovskite alkali metal samarium borohydrides: Crystal structures and thermal decomposition
© 2017 The Royal Society of Chemistry. A new synthesis method of samarium borohydride, Sm(BH4)2, using tetrahydrofuran borane, THF-BH3, and samarium hydride, SmH2, has been demonstrated and verified. The synthesised Sm(BH4)2was mechanochemically treated with MBH4, M = K, Rb, Cs. Initially, the forma...
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| Format: | Journal Article |
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R S C Publications
2017
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| Online Access: | http://hdl.handle.net/20.500.11937/71435 |
| _version_ | 1848762478683488256 |
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| author | Moller, Kasper Jørgensen, M. Fogh, A. Jensen, Torben |
| author_facet | Moller, Kasper Jørgensen, M. Fogh, A. Jensen, Torben |
| author_sort | Moller, Kasper |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | © 2017 The Royal Society of Chemistry. A new synthesis method of samarium borohydride, Sm(BH4)2, using tetrahydrofuran borane, THF-BH3, and samarium hydride, SmH2, has been demonstrated and verified. The synthesised Sm(BH4)2was mechanochemically treated with MBH4, M = K, Rb, Cs. Initially, the formation of KSm(BH4)3is observed while subsequent heat treatment is necessary to form MSm(BH4)3, M = Rb, Cs. The new compounds crystallise in orthorhombic unit cells adopting perovskite-type 3D frameworks containing distorted [Sm(BH4)6] octahedra. In situ X-ray diffraction studies reveal two second-order polymorphic transitions of a-CsSm(BH4)3via a tetragonal intermediate, a'-CsSm(BH4)3, into a cubic high-temperature polymorph, ß-CsSm(BH4)3, resembling an ideal perovskite structure. The new compounds, MSm(BH4)3, are thermally stable up to T ~ 280 °C after which they decompose into mainly MBH4, SmH2and possibly SmB6and SmB12H12. Finally, after three cycles of hydrogen release and uptake, the storage capacity was 1.0 wt% for KSm(BH4)3and 0.84 wt% for RbSm(BH4)3and CsSm(BH4)3. |
| first_indexed | 2025-11-14T10:48:13Z |
| format | Journal Article |
| id | curtin-20.500.11937-71435 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:48:13Z |
| publishDate | 2017 |
| publisher | R S C Publications |
| recordtype | eprints |
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| spelling | curtin-20.500.11937-714352018-12-13T09:32:59Z Perovskite alkali metal samarium borohydrides: Crystal structures and thermal decomposition Moller, Kasper Jørgensen, M. Fogh, A. Jensen, Torben © 2017 The Royal Society of Chemistry. A new synthesis method of samarium borohydride, Sm(BH4)2, using tetrahydrofuran borane, THF-BH3, and samarium hydride, SmH2, has been demonstrated and verified. The synthesised Sm(BH4)2was mechanochemically treated with MBH4, M = K, Rb, Cs. Initially, the formation of KSm(BH4)3is observed while subsequent heat treatment is necessary to form MSm(BH4)3, M = Rb, Cs. The new compounds crystallise in orthorhombic unit cells adopting perovskite-type 3D frameworks containing distorted [Sm(BH4)6] octahedra. In situ X-ray diffraction studies reveal two second-order polymorphic transitions of a-CsSm(BH4)3via a tetragonal intermediate, a'-CsSm(BH4)3, into a cubic high-temperature polymorph, ß-CsSm(BH4)3, resembling an ideal perovskite structure. The new compounds, MSm(BH4)3, are thermally stable up to T ~ 280 °C after which they decompose into mainly MBH4, SmH2and possibly SmB6and SmB12H12. Finally, after three cycles of hydrogen release and uptake, the storage capacity was 1.0 wt% for KSm(BH4)3and 0.84 wt% for RbSm(BH4)3and CsSm(BH4)3. 2017 Journal Article http://hdl.handle.net/20.500.11937/71435 10.1039/c7dt02405c R S C Publications restricted |
| spellingShingle | Moller, Kasper Jørgensen, M. Fogh, A. Jensen, Torben Perovskite alkali metal samarium borohydrides: Crystal structures and thermal decomposition |
| title | Perovskite alkali metal samarium borohydrides: Crystal structures and thermal decomposition |
| title_full | Perovskite alkali metal samarium borohydrides: Crystal structures and thermal decomposition |
| title_fullStr | Perovskite alkali metal samarium borohydrides: Crystal structures and thermal decomposition |
| title_full_unstemmed | Perovskite alkali metal samarium borohydrides: Crystal structures and thermal decomposition |
| title_short | Perovskite alkali metal samarium borohydrides: Crystal structures and thermal decomposition |
| title_sort | perovskite alkali metal samarium borohydrides: crystal structures and thermal decomposition |
| url | http://hdl.handle.net/20.500.11937/71435 |