Investigation of structural and dielectric properties of (La, Fe)-doped PZT ceramics

✍ Scribed by Radheshyam Rai; Seema Sharma; N.C. Soni; R.N.P. Choudhary

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 304 KB
• Volume: 382
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2006.02.024

✦ Synopsis

Polycrystalline samples of iron doped lead lanthanum zirconium titanate (PLFZT) with a general formula Pb 0.9 (La 1Ày Fe y ) 0.1 (Zr 0.55 Ti 0.45 ) 0.975 O 3 , [y ¼ 0:0; 0:3; 0:5; 0:7] near the morphotropic phase boundary have been synthesized by a high-temperature, solidstate reaction technique. Preliminary X-ray structural study of the compounds show the formation of tetragonal structure. Detailed studies of dielectric constant ðeÞ and tangent loss ðtan dÞ as a function of frequency (10 2 Hz to 10 kHz) at room temperature (RT) and temperature (RT-350 1C) at 10 kHz suggest that compounds undergo ferroelectric-paraelectric phase transition of diffuse type. The activation energy (E a ) of the samples was calculated from the plot of AC conductivity versus inverse of absolute temperature. The temperature dependence of resistivity shows that the compounds have negative temperature coefficient of resistance.