Chen L

Chukka R

Pramana SS

Ramanujan RV

Swaminathan V

White TJ

Truncated nanocubes of barium titanate (BT) were synthesized using a rapid, facile microwave-assisted hydrothermal route. Stoichiometric composition of pellets of nanocube BT powders was prepared by two-stage microwave process. Characterization by powder XRD, Rietveld refinement, SEM, TEM, and dielectric and polarization measurements was performed. X-ray diffraction revealed a polymorphic transformation from cubic Pm3̄m to tetragonal P4mm after 15 min of microwave irradiation, arising from titanium displacement along the c-axis. Secondary electron images were examined for nanocube BT synthesis and annealed at different timings. Transmission electron microscopy showed a narrow particle size distribution with an average size of 70 \ub1 9 nm. The remanence and saturation polarization were 15.5 \ub1 1.6 and 19.3 \ub1 1.2 μC/cm2, respectively. A charge storage density of 925 \ub1 47 nF/cm2 was obtained; Pt/BT/Pt multilayer ceramic capacitor stack had an average leakage current density of 5.78 \ub1 0.46 
7 10-8 A/cm2 at \ub12 V. The significance of this study shows an inexpensive and facile processing platform for synthesis of high-k dielectric for charge storage applications. \ua9 2010 American Chemical Society

Microwave synthesis of noncentrosymmetric BaTiO3 truncated nanocubes for charge storage applications

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