Dielectric response of PLZT ceramics �?/57/43 across ferroelectric�?? paraelectric phase transition

Bulletin of materials science

A K Shukla²  S L Srivastava¹  Janardan Singh³  I M L Das¹  V K Agrawal¹ 

[1] Department of Physics, University of Allahabad, Allahabad 211 002, India$$Department of Physics, University of Allahabad, Allahabad 211 002, IndiaDepartment of Physics, University of Allahabad, Allahabad 211 002, India$$;Department of Physics, University of Allahabad, Allahabad 211 002, India$$Department of Physics, Amity Institute of Applied Sciences, Amity University, Noida 201 301, India$$Department of Physics, University of Allahabad, Allahabad 211 002, IndiaDepartment of Physics, University of Allahabad, Allahabad 211 002, India$$Department of Physics, Amity Institute of Applied Sciences, Amity University, Noida 201 301, India$$Department of Physics, Amity Institute of Applied Sciences, Amity University, Noida 201 301, IndiaDepartment of Physics, University of Allahabad, Allahabad 211 002, India$$Department of Physics, Amity Institute of Applied Sciences, Amity University, Noida 201 301, India$$;National Physical Laboratory, Dr K S Krishnan Road, New Delhi 110 012, India$$National Physical Laboratory, Dr K S Krishnan Road, New Delhi 110 012, IndiaNational Physical Laboratory, Dr K S Krishnan Road, New Delhi 110 012, India$$

关键词: PLZT;    dielectric relaxation;    diffuse phase transition.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

The dielectric properties of lead lanthanum zirconate titanate (PLZT) ceramics [Pb(Zr_0.57Ti_0.43)O₃ +ð‘�? at% of La, ð‘�? = 3, 5, 6, 10 and 12] have been measured in the frequency range 1 Hzâ€�??1 MHz using the vector impedance spectroscopy (VIS) at different temperatures. All the compositions show both non-dispersive and dispersive dielectric responses in different temperature regions. The non-dispersive region obeys the universal dielectric response. A low frequency (< 1 kHz) relaxation phenomenon with a high value of distribution parameter `â„Žâ€�? (∼0.4 to 0.6) has been observed in all the compositions around the temperature corresponding to themaximum dielectric constant (ð‘�??_m). The activation energies as calculated from the relaxation and d.c. conduction processes are comparable. The ferroelectric phase transition is diffuse in nature and broadening of the peak increases with La content.

【 授权许可】

Unknown