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Elaboration et caractérisations diélectriques de céramiques ferroélectriques et/ou relaxeur de formule MSnO3-NaNbO3(M=Ba,Ca)

Abstract : The present work reports the elaboration process and physical investigation of ceramics belonging to the chemical systems NaNbO3 - (Ba, Ca)SnO3. These materials are therefore free of lead and all poisonous elements in order to answer to the protective norms of the environment. The studied systems present some continuous solid solutions between the NaNbO3 antiferroelectric phase - that becomes easily ferroelectric by low rate substitutions and the paraelectric stannate phase . Two different dielectric behavior have been evidenced: ferroelectric and relaxor. According to the whole of studies done during this work one can confirm that cationic substitutions in the A site either in the B site of a perovskite ABO3 can modify the dielectric properties of the material. The introduction of Sn4+ cations in B sites favours a relaxor effect. The transition temperature should be modulated by varying the rate of cationic substitution. One can get so relaxor materials close to room temperature.
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https://tel.archives-ouvertes.fr/tel-00009068
Contributor : Abdelhedi Aydi <>
Submitted on : Thursday, April 21, 2005 - 6:14:44 PM
Last modification on : Friday, November 20, 2020 - 5:03:25 PM
Long-term archiving on: : Friday, April 2, 2010 - 10:13:15 PM

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Abdelhedi Aydi. Elaboration et caractérisations diélectriques de céramiques ferroélectriques et/ou relaxeur de formule MSnO3-NaNbO3(M=Ba,Ca). Matériaux. Université Sciences et Technologies - Bordeaux I, 2005. Français. ⟨tel-00009068⟩

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