Single crystals of LiNbO3 are grown by the flux method. Measurements are made in the temperature range 20 to 1170 °C of the dielectric constant ϵ, dielectric loss and relative thermal expansion ΔLl/l along the polar axis (the three‐fold axis x3) and perpendicular to the glide plane (x1). A sharp maximum in ϵ corresponding to a decrease in volume is observed in the x3 direction at 1140 °C. This temperature is assumed to be the Curie temperature of LiNbO3 which corresponds to the transition from an electrically ordered state (ferro or ferrielectric, rather than antiferroelectric) into a paraelectrical state. The temperature dependences of ϵ and Δl/l below the Curie temperature show several similar anomalies. Some of these anomalies may be due to phase transitions.
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