Ferroelectrics · 1983 · 23 citations · 1 references
Natural SciencesMaterials EngineeringMaterials ScienceMaterials CharacterizationMaterials PhysicsSolid-state ChemistryCrystal ChemistryCrystalline MaterialsDielectricsFerroelectric MaterialsThermoelectric MaterialsFerroelectric CrystalsFerroelectric PropertiesFerroelectricityHarmonic GenerationPyroelectric MaterialsPyroelectric PropertiesPyroelectricitySecond-harmonic Generation
A single crystal of composition Li0.02Na0.98NbO3 has been studied by second harmonic generation, dielectric and thermocurrent measurements. The material is ferroelectric and has a polar axis along the [010] direction of the orthorhombic cell. Three transitions have been detected, at T1 = 163 ± 10K, T2 = 540 ± 20K and Tc = 640 ± 20K respectively. A strong maximum of dielectric constant and pyroelectric coefficient appears at Tc. A pyroelectric figure of merit has been calculated, it shows a broad maximum around T2. The results could justify an application for infrared detection.
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