Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 636, Issue -, Pages 93-96Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2015.02.153
Keywords
Ba0.67Sr0.33TiO3; Porous ceramics; Pyroelectric coefficient; Figure-of-merit
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Funding
- National Nature Science Foundation of China [61378076]
- Research Fund of the Doctoral Program of Higher Education of China [20110142120074]
- National Key Scientific Instrument and Equipment Development Projects of China [2013YQ160551]
- Science and Technology Project of Guangzhou [201300000009]
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Porous Ba0.67Sr0.33TiO3 pyroelectric ceramics were fabricated with carbon nanotubes (CNTs) as pore formers and the micro-structural, dielectric, and pyroelectric properties were systemically investigated. The porous BST ceramic fabricated with CNTs exhibited extremely high pyroelectric coefficient of 9500 mu c/m(2) degrees C and figure-of-merit of 32.0 x 10(-5) Pa-0.5 which were 2 and 3 times those of their dense counterpart, along with lower dielectric constant and heat capacity. Compared further with porous BST fabricated with methyl methacrylate as pore former, porous BST fabricated with CNTs also showed higher pyroelectric coefficient and figure-of-merit. All of these improvements are beneficial for the development of pyroelectric devices. Possible reasons for the significant enhancement in pyroelectric performances of the porous ceramics were discussed. (C) 2015 Elsevier B.V. All rights reserved.
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