Dielectric and relaxor ferroelectric properties of Sr4CaLaTi3Nb7O30 tetragonal tungsten bronze ceramics. Issue 9 (November 2015)

• Record Type: Journal Article
• Authors: Zerihun, Gebru; Gong, Gaoshang; Huang, Shuai; Yuan, Songliu
• Is Part Of: Ceramics international. Volume 41:Issue 9(2015)Part B
• Page Start: 12426
• Page End: 12431
• Publication Date: 2015-11
• Subjects: Relaxor ferroelectric -- Burns temperature -- Polar nanoregion -- Vogel–Fulcher relation; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2015.06.084
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Relaxor ferroelectric Sr4 CaLaTi3 Nb7 O30 ceramics were prepared by using the conventional solid state reaction technique. Dielectric property and ferroelectric transition were studied in detail over a broad temperature range. X-ray diffraction analysis revealed that the Sr4 CaLaTi3 Nb7 O30 ceramics crystallizes in the tetragonal tungsten bronze structure with space group P4bm . The dielectric studies confirmed two relaxation regions due to the formation of the polar nanoregions below the deviation temperature ~405 K. Relaxations I and II were attributed possibly due to the relaxational contributions from dipole reversal of polar nanoregions and fluctuation of polar nanoregion boundaries, respectively. A maximum dielectric constant of 1177 was found at a measuring frequency of 500 Hz. Room temperature polarization–electric field ( P – E ) hysteresis loops were assessed and a remnant polarization of 0.65 μC/cm 2 with a coercive field of 3.33 kV/cm was observed under an applied electric field of 58 kV/cm. The Sr4 CaLaTi3 Nb7 O30 ceramics exhibited a prominent dielectric and ferroelectric performance which indicates the potential application of this material in various electronic devices.