Implementing a solid-state synthesis route to tune the functional properties of NaCdP<sub>3</sub>O<sub>9</sub> metaphosphate: optical characteristics, ionic conductivity, and dielectric behavior.

Furthermore, the resistance values ( R ) exhibit a decreasing trend with increasing temperature, which is consistent with the semiconducting behavior.

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Its variation with temperature depends on the specific transport model: 54–57 • In the Correlated Barrier Hopping (CBH) model, “ s ” exhibits an increasing trend as temperature rises. • In the Non-Small Polaron Tunneling (NSPT) model, “ s ” decreases with increasing temperature. • In the Overlapping Large Polaron Tunneling (OLPT) model, “ s ” initially declines, reaches a minimum, and then starts to rise again. • When “ s ” remains nearly constant across different temperatures, it indicates that the material follows the Quantum Mechanical Tunneling (QMT) conduction mechanism.

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