Abstract
Cubic RbNO 3 has been stabilized or is metastable at room temperature using the heating-cooling process which is described in the paper. The cubic lattice parameters aggree with that of RbNO 3 for temperatures above 160°C, excluding the temperature influence. The cubic unit parameters are slightly changed with different heating temperatures, e.g. 8.495±0.005 Å and 8.467±0.005 Å for the 580°C and 800°C heat- treated RbNO 3 samples, respectively. The samples obtained from heating-cooling at different temperatures also showed different phase structures. Compared to the raw RbNO 3, the room temperature, metastable, cubic structure has a more distorted NO 3 environment which is caused by the stronger metal-NO 3 coordination bonds. The degree of the coordination interaction is mainly characterized by the ν 3 band splitting.
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