Investigation of AgI-Based Solid Solutions with Ag2CO3

• Published in: Technologies (Basel) Vol. 9; no. 3; p. 54
• Main Authors: Uchida, Kento, Matsushima, Yuta
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.09.2021
• Subjects: Ag2CO3; AgI; Conductivity; Differential thermal analysis; Differential thermogravimetric analysis; Electrical resistivity; Electrolytes; Iodides; ionic conductor; Phase transitions; Reaction products; Room temperature; silver carbonate iodide; solid electrolyte; solid solution; Solid solutions; Temperature; Thermogravimetry; Unit cell; Japan
• ISSN: 2227-7080; 2227-7080
• DOI: 10.3390/technologies9030054

The formation phenomena of silver carbonate (Ag2CO3)–silver iodide (AgI) solid solutions were investigated by X-ray diffraction, thermogravimetry-differential thermal analysis, and electrical conductivity measurement. Results revealed that AgI and Ag2CO3 reacted with each other when mixed at room temperature. The reaction products were classified into three types: (1) AgI-based solid solutions in the AgI-rich region for x = 10% or less in x Ag2CO3–(1 − x) AgI; (2) Ag2CO3-based solid solutions in the Ag2CO3-rich region for x = 60% or more; and (3) silver carbonate iodides in the intermediate range for x between 10% and 60%. For the AgI-based solid solutions, the incorporation of Ag2CO3 into the AgI lattice expanded the unit cell and enhanced electrical conductivity. The solubility limit of Ag2CO3 into the AgI lattice estimated from the differential thermal analysis was x ≈ 5%.