Anion Distribution in Superionic Ag3PO4-AgI Glasses Revealed by Dipolar Solid-State NMR

Author(s)

Ren, Jinjun ^[1] ; Eckert, Hellmut ^{[1, 2]}

Affiliation

^[1] Univ Munster, Inst Phys Chem, D-48149 Munster - Germany

^[2] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13590 Sao Carlos - Brazil

• Document type: Journal article
• Source: Journal of Physical Chemistry C; v. 117, n. 47, p. 24746-24751, NOV 28 2013.
• Web of Science Citations: 15

Abstract

The structure of roller-quenched fast ion conductive glasses (FICs) (Ag3PO4)(x)(AgI)(1-x) (0.15 <= x <= 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. (AU)

• FAPESP's process: 13/07793-6 - CEPIV - Center for Teaching, Research and Innovation in Glass
• Grantee: Edgar Dutra Zanotto
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC