Nioboaeschynite-(Ce), Ce(NbTi)O6
作者： Shaunna M. Morrison , Robert T. Downs , Kenneth J. Domanik , Hexiong Yang , Donald Doell
DOI: 10.1107/S1600536812031765
关键词:
摘要: Nioboaeschynite-(Ce), ideally Ce(NbTi)O6 [cerium(III) niobium(V) titanium(IV) hexaoxide; refined formula of the natural sample is Ca0.25Ce0.79(Nb1.14Ti0.86)O6], belongs to aeschynite mineral group which characterized by general AB2(O,OH)6, where eight-coordinated A a rare earth element, Ca, Th or Fe, and six-coordinated B Ti, Nb, Ta W. The structural feature nioboaeschynite-(Ce) resembles that other members group. It edge-sharing dimers [(Nb,Ti)O6] octahedra share corners form three-dimensional framework, with sites located in channels parallel b axis. average A—O B—O bond lengths are 2.471 1.993 A, respectively. Moreover, another site, designated as C also partially occupied A-type cations. Additionally, refinement revealed splitting Ca displaced slightly from Ce (0.266 A apart), presumably resulting crystal-chemical differences between Ce3+ Ca2+
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sci-hub.se 参考文章(20)
Radek Škoda, Milan Novák, Y,REE,Nb,Ta,Ti-oxide (AB2O6) minerals from REL–REE euxenite-subtype pegmatites of the Třebíč Pluton, Czech Republic; substitutions and fractionation trends Lithos. ,vol. 95, pp. 43- 57 ,(2007) , 10.1016/J.LITHOS.2006.07.020
Lena Jahnberg, L. S. Hersh, J. M. Toguri, Kenneth Hedberg, M. Trætteberg, Crystal Structure of Orthorhombic CaTa2O6. Acta Chemica Scandinavica. ,vol. 17, pp. 2548- 2559 ,(1963) , 10.3891/ACTA.CHEM.SCAND.17-2548
S. Sumi, P. Prabhakar Rao, M. Deepa, Peter Koshy, Electrical conductivity and impedance spectroscopy studies of cerium based aeschynite type semiconducting oxides: CeTiMO6 (M=Nb or Ta) Journal of Applied Physics. ,vol. 108, pp. 063718- ,(2010) , 10.1063/1.3481389
Xiaoding Qi, Chieh-Min Liu, Chung-Chiang Kuo, Pr3+ doped LaTiNbO6 as a single phosphor for white LEDs Journal of Alloys and Compounds. ,vol. 492, ,(2010) , 10.1016/J.JALLCOM.2009.11.188
Simon P. Westrip, publCIF: software for editing, validating and formatting crystallographic information files Journal of Applied Crystallography. ,vol. 43, pp. 920- 925 ,(2010) , 10.1107/S0021889810022120
Qian Ma, Aiyu Zhang, Mengkai Lü, Yuanyuan Zhou, Zifeng Qiu, Guangjun Zhou, Novel Class of Aeschynite Structure LaNbTiO6-Based Orange-Red Phosphors via a Modified Combustion Approach Journal of Physical Chemistry B. ,vol. 111, pp. 12693- 12699 ,(2007) , 10.1021/JP0739162
Gordon J. Thorogood, Maxim Avdeev, Brendan J. Kennedy, Structural studies of the aeschynite–euxenite transformation in the series Ln(TiTa)O6 Ln = Lanthanide Solid State Sciences. ,vol. 12, pp. 1263- 1269 ,(2010) , 10.1016/J.SOLIDSTATESCIENCES.2010.02.036
Akinori Kan, Hirotaka Ogawa, Crystal Structural Characterization and Microwave Dielectric Properties of Ca(Ta2-xNbx)O6 Ceramics Japanese Journal of Applied Physics. ,vol. 47, pp. 7716- 7720 ,(2008) , 10.1143/JJAP.47.7716
Zhuming Yang, Martin Smith, Paul Henderson, Michael J. LeBas, Kejie Tao, Peishan Zhang, Compositional variation of aeschynite-group minerals in the Bayan Obo Nb-REE-Fe ore deposit, Inner Mongolia, China European Journal of Mineralogy. ,vol. 13, pp. 1207- 1214 ,(2001) , 10.1127/0935-1221/2001/0013-1207
L. Alianelli, K. J. S. Sawhney, A. Malik, O. J. L. Fox, P. W. May, R. Stevens, I. M. Loader, M. C. Wilson, A planar refractive x-ray lens made of nanocrystalline diamond Journal of Applied Physics. ,vol. 108, pp. 1- 4 ,(2010) , 10.1063/1.3517060