Abstract
Ceramics of the La 2O 3–TiO 2 system have very good dielectric properties, which make La 2Ti 2O 7 a good candidate for microwave applications. Using radio-frequency magnetron sputtering, we have deposited LaTiO x N y oxynitride thin films on (0 0 1) strontium titanate and glass substrates, starting from a homemade oxide target. The microwave dielectric properties of La 2Ti 2O 7 ceramic have been investigated in the 100 Hz to 10 GHz range in order to have a reference for further studies. The evolution of ɛ′ and ɛ″ shows a space charge domain with a critical frequency F c = 1 GHz. Measurements in the temperature range from 20 to 880 °C have been carried out to study phase transitions and conduction mechanisms.
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