Structure and Ionic-Transport Properties of Lithium-Containing Garnets Li3Ln3Te2O12 (Ln = Y, Pr, Nd, Sm-Lu)
详细信息 查看全文
- 作者：Michael P. O'Callaghan ; Danny R. Lynham ; Edmund J. Cussen ; George Z. Chen
- 刊名：Chemistry of Materials
- 出版年：2006
- 出版时间：September 19, 2006
- 年：2006
- 卷：18
- 期：19
- 页码：4681 - 4689
- 全文大小：235K
- 年卷期：v.18,no.19(September 19, 2006)
- ISSN：1520-5002
文摘
Lithium-containing compounds of the formula Li3Ln3Te2O12 (Ln = Y, Pr, Nd, Sm-Lu) have beenprepared by solid-state ceramic methods at temperatures up to 900 
C. Rietveld refinement against X-rayand neutron powder diffraction data show that these phases adopt the garnet structure (space group Ia
d)with lattice parameters in the range 12.15970(14) Å (Li3Lu3Te2O12) to 12.61596(7) Å (Li3Pr3Te2O12).The Ln3+ and Te6+ cations occupy the 8-fold and octahedrally coordinated sites, and Li+ is accommodatedexclusively in the tetrahedral sites commonly occupied in the garnet structure. Neutron diffraction datacollected from Li3Nd3Te2O12 at 300 and 600 C show that the lithium coordination does not change overthis temperature range. Impedance spectroscopy measurements indicate that Li3Nd3Te2O12 shows minimalLi+ mobility with an activation energy of 1.22(15) eV, resulting in a maximum observed conductivity of
1 × 10-5 S cm-1 at 600 C.
C. Rietveld refinement against X-rayand neutron powder diffraction data show that these phases adopt the garnet structure (space group Iad)with lattice parameters in the range 12.15970(14) Å (Li3Lu3Te2O12) to 12.61596(7) Å (Li3Pr3Te2O12).The Ln3+ and Te6+ cations occupy the 8-fold and octahedrally coordinated sites, and Li+ is accommodatedexclusively in the tetrahedral sites commonly occupied in the garnet structure. Neutron diffraction datacollected from Li3Nd3Te2O12 at 300 and 600 C show that the lithium coordination does not change overthis temperature range. Impedance spectroscopy measurements indicate that Li3Nd3Te2O12 shows minimalLi+ mobility with an activation energy of 1.22(15) eV, resulting in a maximum observed conductivity of 1 × 10-5 S cm-1 at 600 C.