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Synthesis, structural characterization and formation mechanism of giant-dielectric CaCu3Ti4O12 nanotubes

Natural Science 2010年第7期2卷 688-693页

作者： Nirupam Banerjee saluru baba krupanidhi 不详

A capillary-enforced template-based method has been applied to fabricate calcium copper titanate (CaCu3Ti4O12, CCTO) nanotubes (diameter ~200 nm) by filling sol-gel CCTO precursor solution into the nanochannels of porous anodic aluminum oxide (AAO) templates, subsequent heating for phase formation and fi- nally the removal of nano-channel templates by applying basic solution. X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) equipped with Energy-dispersive X-ray spectroscopy (EDX) have been employed to characterize the morphology, structure, and composition of as-prepared nanotubes. XRD and selected-area electron diffraction (SAED) in-vestigations demonstrated that postannealed (750○C for 1 h) CCTO nanotubes were poly-crystalline with a cubic pseudo-perovskite cry- stal structure. The FE-SEM and TEM results showed that CCTO nanotubes were of uniform diameter (~200 nm) throughout their length. High resolution TEM (HRTEM) analysis confirm- ed that the obtained CCTO nanotubes are made of randomly aligned nano-particles 5-10 nm in size. EDX analysis demonstrated that stoichi- ometric CaCu3Ti4O12 was formed. The possible formation mechanism of CCTO nanotubes in the AAO template is discussed.

关键词： Nano-Tubes Sol-Gel Templated Growth High-K-Dielectrics

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Structural and electrical characterization of Bi2VO5.5 / Bi4Ti3O12 bilayer thin films deposited by pulsed laser ablation technique

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Natural Science 2010年第10期2卷 1073-1078页

作者： Neelam Kumari saluru baba krupanidhi Kalidhindi Balakrishna Raju Varma 不详

The pulsed laser ablation technique has been employed to fabricate bilayer thin films con-sisting of layered structure ferroelectric bismuth vanadate (Bi2VO5.5) and bismuth titanate (Bi4Ti3O12) on platinized silicon substrate. The phase formation of these films was confirmed by X-ray diffraction (XRD) studies and the crystallites in these bilayers were randomly oriented as indicated by diffraction pattern consisting of the peaks corresponding to both the materials. The homogeneous distribution of grains (~300 nm) in these films was confirmed by atomic force microscopy. The cross-sectional scanning electron microscopy indicated the thickness of these films to be around 350 nm. The film exhi-bited P-E hysteresis loops with Pr ~ 11 ?C/cm2 and Ec ~ 115 kV/cm at room temperature. The dielectric constant of the bilayer was ~ 225 at 100 kHz which was higher than that of homogeneous Bi2VO5.5 film.

关键词： Thin Films Ferroelectric Dielectric Laser ablation

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Synthesis, structural characterization and formation mechanism of giant-dielectric CaCu3Ti4O12 nanotubes

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Natural Science（自然科学期刊） 2010年第7期

作者： Nirupam Banerjee saluru baba krupanidhi

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Structural and electrical characterization of Bi2VO5.5/Bi4Ti3O12 bilayer thin films deposited by pulsed laser ablation technique

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Natural Science（自然科学期刊） 2010年第10期

作者： Neelam Kumari saluru baba krupanidhi Kalidhindi Balakrishna Raju Varma

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