科研之友
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摘要
The structure of roller-quenched fast ion conductive glasses (FICs) (Ag3PO4)(x)(AgI)(1-x) (0.15 %26lt;= x %26lt;= 0.50) is investigated by Ag-109 and P-31 solid-state NMR spectroscopies. Monotonic linear dependences of Ag-109 and P-31 chemical shifts on x are consistent with a statistical distribution of the phosphate and iodide anions. This conclusion is quantitatively confirmed by a new P-31 homonuclear magnetic dipolar recoupling method, termed double-quantum-based dipolar recoupling effects nuclear alignment reduction (DQ-DRENAR), which numerically proves a random spatial distribution of the phosphate anions. Altogether these results give the final answer to a long-standing debate on the structure of silver in AgI-based (FIC) glasses, proving the absence of previously postulated silver iodide cluster domains.
- 出版日期2013-11-28
