A Low-Cost Chemical Route for High Dielectric Constant Plate-Shaped Nanocrystalline CaCu3Ti4O12
IR@NPL: CSIR-National Physical Laboratory, New Delhi
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| Title |
A Low-Cost Chemical Route for High Dielectric Constant Plate-Shaped Nanocrystalline CaCu3Ti4O12
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| Creator |
Kumar, Ranjit
Zulfequar, M. Singh, V. N. Singh, Sukhvir Senguttuvan, T. D. |
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| Subject |
Nanoscience/ Nanotechnology
Physics |
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| Description |
Nanocrystalline CaCu3Ti4O12 (CCTO) dielectric ceramics were prepared by a low-cost sol–gel technique. Sols
were aged for 48, 72, 96 and 120 hours at constant humidity. The samples were calcined at 700 �C and
sintered at 1025 �C. XRD patterns revealed the formation of cubic perovskite CaCu3Ti4O12, with traces of CuO.
HRTEM images showed interfacial spacing of 0.22 nm and 0.18 nm; corresponding to (222) and (400) planes
of the body-centered cubic perovskite structure, respectively. Selected area electron diffraction (SAED) patterns
indicated the presence of polycrystalline CCTO. SEM micrograph revealed that the grains are compacted and
having a plate-like structure. Frequency and temperature dependence of dielectric constant and losses were
also studied. I–V characteristics changed from nonlinear to linear for the sol aged for 120 hours. EDX spectra
showed an increase in oxygen content with increase in sol ageing time. The presence of CuO and oxygen ion
may be the cause of increased dielectric constant for samples aged for longer time.
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| Publisher |
American Scientific Publishers
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| Date |
2012
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://npl.csircentral.net/2229/1/A%20low%20cost%20chemical%20route_vol52012.pdf
Kumar, Ranjit and Zulfequar, M. and Singh, V. N. and Singh, Sukhvir and Senguttuvan, T. D. (2012) A Low-Cost Chemical Route for High Dielectric Constant Plate-Shaped Nanocrystalline CaCu3Ti4O12. Advanced Science Letters , 5 (1). pp. 1-5. ISSN 1936-7317 |
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| Relation |
http://npl.csircentral.net/2229/
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