https://scholars.lib.ntu.edu.tw/handle/123456789/575856
標題: | Correlated N/O anion orders in melilite phosphors | 作者: | Kayser P Johnston H.E Fang M.-H Keen D.A Liu R.S Attfield J.P. RU-SHI LIU |
關鍵字: | Ions; Light emission; Phosphors; Silicon compounds; Yttrium compounds; Anion distribution; Anion ordering; Host materials; Molar entropies; Oxynitrides; Powder neutron diffraction; Spectroscopic features; Structural correlation; Nitrogen compounds | 公開日期: | 2020 | 卷: | 284 | 來源出版物: | Journal of Solid State Chemistry | 摘要: | The N/O anion distributions in the melilite-type phosphor host material Y2Si3O3N4 and a Ce-doped sample Y1.5Ce0.5Si3O3N4 have been determined from powder neutron diffraction. Both materials have a highly ordered N/O distribution that is not changed significantly by the disorder introduced by Ce doping. This distribution evidences the presence of SiN3O and SiN2O2 tetrahedra and although these are not fully long range-ordered, local structural correlations follow simple connectivity rules that lead to an estimated residual molar entropy of R ln3. A broad range of N/O environments is found around 8-coordinate Y(Ce) sites which is expected to broaden their spectroscopic features. ? 2020 Elsevier Inc. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85078701841&doi=10.1016%2fj.jssc.2020.121198&partnerID=40&md5=5ee98c4050061cd669c139dad3fd4aef https://scholars.lib.ntu.edu.tw/handle/123456789/575856 |
ISSN: | 224596 | DOI: | 10.1016/j.jssc.2020.121198 |
顯示於: | 化學系 |
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