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Crystal chemistry of melilite [CaLa]2[Ga]2[Ga2O7]2 : a five dimensional solid electrolyte

หน่วยงาน Nanyang Technological University, Singapore

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ชื่อเรื่อง : Crystal chemistry of melilite [CaLa]2[Ga]2[Ga2O7]2 : a five dimensional solid electrolyte
นักวิจัย : Wei, Fengxia , Baikie, Tom , An, Tao , Kloc, Christian , Wei, Jun , White, Timothy John
คำค้น : -
หน่วยงาน : Nanyang Technological University, Singapore
ผู้ร่วมงาน : -
ปีพิมพ์ : 2555
อ้างอิง : Wei, F., Baikie, T., An, T., Kloc, C., Wei, J., & White, T. (2012). Crystal chemistry of melilite [CaLa]2[Ga]2[Ga2O7]2 : a five dimensional solid electrolyte. Inorganic chemistry, 51(10), 5941-5949. , 0020-1669 , http://hdl.handle.net/10220/11600 , http://dx.doi.org/10.1021/ic300585t
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : Inorganic chemistry
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

Melilite-type [A2]2[BI]2[BII2O7]2 gallates are promising ion conducting electrolytes for deployment in solid oxide fuel cells. Single crystals of [CaLa]2[Ga]2[Ga2O7]2, grown in an optical floating zone furnace, were investigated using a combination of transmission electron microscopy and single crystal X-ray diffraction. Strong anisotropic displacements of oxygen arise from the structural misfit between the interlayer Ca/La cations and the [Ga]-[Ga2O7] tetrahedral layers. A model employing two-dimensional modulation achieves bond lengths and bond angles that preserve satisfactory bond valence sums throughout the structure. The melilite belongs to the tetragonal superspace group P4̅21m(α, α, 0)00s(α̅, α, 0)000, α = 0.2160(5), with a subcell metric of a = 7.9383(2) Å, c = 5.2641(3) Å, onto which modulation vectors are superimposed: q1 = α (a* + b*), q2 = α (−a* + b*). Both displacive (cation and anion) and occupational (cation) modulations contribute to incommensuration. The analysis of structural adjustments that accompany changes in temperature and composition provides assurance that the crystal chemical model is correct. By better understanding the flexibility of this modulated structure a rational approach toward crystallochemical optimization of electrolyte performance by enhancing oxygen mobility becomes feasible.

บรรณานุกรม :
Wei, Fengxia , Baikie, Tom , An, Tao , Kloc, Christian , Wei, Jun , White, Timothy John . (2555). Crystal chemistry of melilite [CaLa]2[Ga]2[Ga2O7]2 : a five dimensional solid electrolyte.
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Wei, Fengxia , Baikie, Tom , An, Tao , Kloc, Christian , Wei, Jun , White, Timothy John . 2555. "Crystal chemistry of melilite [CaLa]2[Ga]2[Ga2O7]2 : a five dimensional solid electrolyte".
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Wei, Fengxia , Baikie, Tom , An, Tao , Kloc, Christian , Wei, Jun , White, Timothy John . "Crystal chemistry of melilite [CaLa]2[Ga]2[Ga2O7]2 : a five dimensional solid electrolyte."
    กรุงเทพมหานคร : Nanyang Technological University, Singapore, 2555. Print.
Wei, Fengxia , Baikie, Tom , An, Tao , Kloc, Christian , Wei, Jun , White, Timothy John . Crystal chemistry of melilite [CaLa]2[Ga]2[Ga2O7]2 : a five dimensional solid electrolyte. กรุงเทพมหานคร : Nanyang Technological University, Singapore; 2555.