Dielectric properties of the nanoporous MCM-41 matrix filled with the (NH4)2SO4 ferroelectric

S. V. Baryshnikov, E. V. Charnaya, A. Yu Milinskii, A. Yu Goikhman, C. Tien, M. K. Lee, L. J. Chang

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Variations with temperature of the linear dielectric permittivity and amplitude of the third harmonic were studied for nanoporous MCM-41 matrices with 4.0-nm channel pores filled with the (NH4)2SO4 ferroelectric, in comparison with bulk ammonium sulfate. The measurements were performed upon heating and cooling in the temperature range from 100 K to room temperature. A noticeable shift to low temperatures (by approximately 25 K) for the ferroelectric phase transition in the MCM-41/(NH4)2SO4 nanocomposite as compared to bulk (NH4)2SO4 was revealed. The temperature hysteresis observed at the phase transition in the nanocomposite was approximately 2 K which is close to that in bulk ammonium sulfate. The significant decrease of the transition temperature in nanostructured ammonium sulfate agrees with the theoretical predictions based on the Landau and Ising models of the size effect on the ferroelectric phase transition in isolated small particles.

頁(從 - 到)1070-1073
期刊Physics of the Solid State
出版狀態Published - 2013 5月

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 凝聚態物理學


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