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The far infrared and submillimeter dielectric function of sodium nitrate single crystal is determined by means of precise transmission spectroscopy (7 to 18 cm −1 ) and reflexion spectroscopy (10 to 600 cm −1 ) over the temperature range 20 to 275 °C, parallel and perpendicular to the crystallographic  c ‐axis. All the infrared active lattice modes are observed and their parameters calculated using the factorized form of the dielectric function. A relaxation is introduced to explain the low‐frequency dielectric function in the two directions.