The Korean Journal of Ceramics

한국세라믹학회 (The Korean Ceramic Society)
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Investigation of Lattice Effects in Perovskites by $O-isotope^{18}$ Exchange

  • Itoh, Mitsuru (Materials & Structures Laboratory Tokyo Institute of Technology 4259 Nagatsuta) ;
  • Mahesh, Rajappan (Materials & Structures Laboratory Tokyo Institute of Technology 4259 Nagatsuta) ;
  • Wang, Ruiping (Materials & Structures Laboratory Tokyo Institute of Technology 4259 Nagatsuta)
  • 발행 : 2000.09.01
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초록

In the present study, preliminary experimental results of the change in the properties of perovskite-type oxides caused by the $^{18}O$- exchange have been reported. Two systems were selected for the exchange, (1) $ATiO_3$(A=Ca,Sr,Ba) and (2) manganese perovskite. The dielectric properties of isotope-exchanged $SrTi^{18}O_3$showed a drastic change from a quantum paraelectricity below 3K to ferroelectric-like behavior with a peak at 23K and an enhanced dielectric constant, 35000 at the peak. On the contrary, the $T_c$ for $BaTiO_3$was found to increase by 0.9K. The observed isotope shift of $T_c$ as well as $T_co$ for the manganese perovskites is correlated with the key parameters controlling the lattice such as $Mn^{3+}$ content, average ionic radius of the A-site cation <$r_A$> ad A-site ionic disorder $\sigma^2$.

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