Unusual dielectric response in B-site size-disordered hexagonal transition metal oxides
IR@CGCRI: CSIR-Central Glass and Ceramic Research Institute, Kolkata
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| Title |
Unusual dielectric response in B-site size-disordered hexagonal transition metal oxides
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| Creator |
Choudhury, Debraj
Venimadhav, Adyam Kakarla, Chandrasekhar Delaney, Kris T Sujatha Devi, P Mondal, P Nirmala, R Gopalakrishnan, J Spaldin, Nicola A Waghmare, Umesh V Sarma, D D |
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| Subject |
Electronics
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| Description |
We discover that hexagonal holmium copper titanate (Ho(2)CuTiO(6)), has a unique and highly desirable combination of high dielectric constant, low losses, very small temperature coefficient, and low frequency dependence. Our first-principles calculations indicate that these exceptional properties result from a size-difference at the Cu/Ti B-site that suppresses the expected ferroelectric transition, combined with the dominance of intermediate-frequency polar vibrational modes in the dielectric response. Our results suggest that the use of such B-site disorder in alloys of hexagonal transition-metal oxides should generally result in similar robust dielectrics. (C) 2010 American Institute of Physics. [doi:10.1063/1.3379293]
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AMER INST PHYSICS
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| Date |
2010-04
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Article
PeerReviewed |
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application/pdf
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| Identifier |
http://cgcri.csircentral.net/633/1/sujatha'10.pdf
Choudhury, Debraj and Venimadhav, Adyam and Kakarla, Chandrasekhar and Delaney, Kris T and Sujatha Devi, P and Mondal, P and Nirmala, R and Gopalakrishnan, J and Spaldin, Nicola A and Waghmare, Umesh V and Sarma, D D (2010) Unusual dielectric response in B-site size-disordered hexagonal transition metal oxides. APPLIED PHYSICS LETTERS, 96 (16). Article No.-162903. ISSN 0003-6951 |
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http://cgcri.csircentral.net/633/
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