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  • Title: Terahertz dielectric response of ferroelectric Ba(x)Sr(1-x)TiO3 thin films.
    Author: Kang SB, Kwak MH, Choi M, Kim S, Kim T, Cha EJ, Kang KY.
    Journal: IEEE Trans Ultrason Ferroelectr Freq Control; 2011 Nov; 58(11):2276-80. PubMed ID: 22083760.
    Abstract:
    Terahertz time-domain spectroscopy has been used to investigate the dielectric and optical properties of ferroelectric Ba(x)Sr(1-x)TiO(3) thin films for nominal x-values of 0.4, 0.6, and 0.8 in the frequency range of 0.3 to 2.5 THz. The ferroelectric thin films were deposited at approximately 700 nm thickness on [001] MgO substrate by pulsed laser deposition. The measured complex dielectric and optical constants were compared with the Cole-Cole relaxation model. The results show that the Cole-Cole relaxation model fits well with the data throughout the frequency range and the dielectric relaxation behavior of ferroelectric Ba(x)Sr(1-x)TiO(3) thin films varies with the films compositions. Among the compositions of Ba(x)Sr(1-x)TiO(3) films with different Ba/Sr ratios, Ba(0.6)Sr(0.4)TiO(3) has the highest dielectric constants and the shortest dielectric relaxation time.
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