Thermal conductivity of SrBi2Nb2O9 ferroelectric thin films

M.O. Boffoue , A. Jacquot , Jean-René Duclere (1) , Maryline Guilloux-Viry , J. Hejtmanek , A. Dauscher (2) , B. Lenoir (2)

1 Axe 3 : organisation structurale multiéchelle des matériaux
2 LPM - Laboratoire de physique des matériaux

Ferroelectric Aurivillius SrBi2Nb2O9 films of different thicknesses were prepared on Si100 substrates by pulsed laser deposition. The films are polycrystalline and exhibit an increased grain size with film thickness. The cross-plane thermal conductivity of such SrBi2Nb2O9 films was measured in the 100–300 K temperature range by the 3 method and it was observed that the thermal properties of this family of ferroelectric materials show a glasslike behavior. The measurements performed on a polycrystalline bulk SrBi2Nb2O9 sample, in the 10–300 K temperature range, led to identical conclusions. The origin of this unexpected glasslike behavior is discussed.

M.O. Boffoue, A. Jacquot, Jean-René Duclere, Maryline Guilloux-Viry, J. Hejtmanek, et al.. Thermal conductivity of SrBi2Nb2O9 ferroelectric thin films. Applied Physics Letters, 2006, 89, pp.092904-1-092904-3. ⟨10.1063/1.2335817⟩. ⟨hal-00093922⟩