| Original Articles |
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Electrical and Pyroelectric Properties of Sol-Gel Derived (Pb,
Ca)TiO3 Thin Films with Various Orientations |
| TANG Xin-Gui1;DING Ai-Li2;CHAN Helen Lai-Wah1 |
| 1Department of Applied Physics and Materials Research Centre, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
2Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050 |
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| Cite this article: |
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TANG Xin-Gui, DING Ai-Li, CHAN Helen Lai-Wah 2003 Chin. Phys. Lett. 20 2039-2041 |
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Abstract (Pb0.76Ca0.24)TiO3 (PCT) thin films with various orientations were grown on Pt/Ti/SiO2/Si substrates by using a sol-gel process and by controlling the temperature of heat-treatment. The PCT thin films with (100) and random orientation showed well-saturated hysteresis loops at an applied field of 800 kV/cm, with remanent polarisation and coercive electric field of 23.6 μC/cm2 and 225kV/cm, 17.8 μC/cm2 and 195 kV/cm, respectively. For highly (100)- and random-oriented PCT films, the dielectric constant and dielectric loss values of these films are 121 and 0.016, 121 and 0.024 at 1 kHz, respectively. The pyroelectric coefficients p of the PCT thin films are measured by a dynamic technique. At room temperature, the p values and figures of merits of the highly (100)- and random-oriented PCT films are 185 μC/m2K and 1.79 xm 10-5Pa-0.5, 176μC/m2K and 1.39 x 10-5Pa-0.5, respectively.
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| Keywords:
77.84.-s
68.55.-a
77.22.Ch
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Published: 01 November 2003
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| PACS: |
77.84.-s
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(Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials)
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68.55.-a
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(Thin film structure and morphology)
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77.22.Ch
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(Permittivity (dielectric function))
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