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We have studied the shrinkage kinetics and mechanism of NaZr
2
(PO
4
)
3
containing inorganic additives. The sintering of NaZr
2
(PO
4
)
3
containing ZnO microadditives is shown to follow a liquid-phase mechanism. Effective sintering aids include oxides of metals in the oxidation states
2+
and
3+
that are capable of reacting with sodium zirconium phosphate to form solid solutions. Ceramics having a relative density of 96–99% and isostructural with NaZr
2
(PO
4
)
3
can be prepared by adding 0.75–2.0 wt % ZnO as a sintering aid capable of influencing the structure of grain boundaries in ceramic materials, pressing green bodies at 200–300 MPa, and sintering them at 1000–1100°C for 7–15 h.