title: First total H+/Li+ ion exchange in garnet-type Li5La3Nb2O12 using organic acids and studies on the effect of Li stuffing.
abstract: Garnet-type Li(5+x)Ba(x)La(3-x)Nb(2)O(12) (x = 0, 0.5, 1) was prepared using a ceramic method, and H(+)/Li(+) ion exchange was performed at room temperature using organic acids, such as CH(3)COOH and C(6)H(5)COOH, as proton sources. Thermogravimetric analysis showed that H(+)/Li(+) ion exchange was nearly (100%) completed using the x = 0 member with CH(3)COOH, while it proceeded to about 40% for x = 0.5 and 13% for x = 1. In C(6)H(5)COOH, proton exchange proceeded to about 82% for x = 0, ∼40% for x = 0.5, and ∼25% for x = 1. Similar proton-exchange trends were reported in H(2)O, where ion exchange occurs more readily for garnets with lower Li content in Li(5+x)Ba(x)La(3-x)Nb(2)O(12), that is, when excess Li ions preferentially reside in the tetrahedral sites of the garnet structure.
authors.affiliation: Department of Chemistry, University of Calgary, Calgary, Alberta T2N 1N4, Canada.
authors.forename: Lina
authors.initials: L
authors.lastname: Truong
authors.forename: Venkataraman
authors.initials: V
authors.lastname: Thangadurai