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Constant-pressure, constant-temperature variable-shape simulation cell Monte Carlo and microcanonical ensemble molecular dynamics simulation of superionic conducting rhombohedral phase of Nasicon, Na1+xZr2Si3-xO12, 0 less than or equal to x less than or equal to 3, at a temperature of 600 K is reported. Changes in structure, conductivity, hop path, site occupancies, bond lengths of framework atoms with composition are discussed. Average Na(1)-O distance shows a peak at x = 2, while Na(2)-O distance shows a monotonic increase. Sum of the sodium occupancies at Na(l) and mid-Na sites adds up to a constant value of one which supports the conclusion of Boilot et al.(1) based on X-ray diffraction. Occupancy of Na(l) site attains a minimum at x = 2. The predominant conduction channel (which carries more than 90% of the sodium ions) is found to be the one connecting Na(1)-mid-Na-Na(2). Density contours for sodium, depicting this conduction channel, are reported. Free energy profile along the conduction channel suggests that entropy contribution cannot be neglected. The mid-Na site is not associated with a free energy minimum

the journal of physical chemistry b

Structure, Conductivity, and Ionic Motion in Na1+xZr2SixP3-xO12: A Simulation Study