Lattice assisted dielectric relaxation in four-layer Aurivillius Bi5FeTi3O15 ceramic at low temperatures

被引：4
|
作者：
Prajapat, Deepak [1 ]
Surampalli, Akash [1 ]
Schiesaro, Irene [2 ]
Kaushik, S. D. [3 ]
Meneghini, Carlo [2 ]
Sagdeo, Archna [4 ,5 ]
Sathe, V. G. [1 ]
Siruguri, V [1 ]
Welter, Edmund [6 ]
Reddy, V. Raghavendra [1 ]
机构：
[1] UGC DAE Consortium Sci Res, Univ Campus,Khandwa Rd, Indore 452001, India
[2] Univ Roma Tre, Dipartimento Scie, I-00146 Rome, Italy
[3] BARC, UGC DAE Consortium Sci Res, Mumbai Ctr, R-5 Shed, Mumbai 400085, India
[4] RRCAT, Synchrotrons Utilizat Sect, Indore, India
[5] Homi Bhabha Natl Inst, Training Sch Complex, Mumbai 400094, Maharashtra, India
[6] Deutsch Elekt Synchrotron A Res Ctr, Helmholtz Assoc, D-22607 Hamburg, Germany
来源：
JOURNAL OF PHYSICS-CONDENSED MATTER | 2021年 / 33卷 / 35期
关键词：
four layer Aurivillius compound; dielectric relaxation; Mossbauer spectroscopy; Raman spectroscopy; EXAFS; neutron diffraction; BISMUTH TITANATE; FERROELECTRICITY; DIFFRACTION; SCATTERING; BEHAVIOR; EDGE;
D O I：
10.1088/1361-648X/ac0c3b
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
We have investigated magnetic, structural and dielectric properties of Bi5FeTi3O15 (BFTO) in the temperature range 5K-300 K. Using diffraction, Raman spectroscopy and x-ray absorption fine structure measurements, iso-structural modifications are observed at low temperatures (approximate to 100 K). The analysis of dielectric constant data revealed signatures of dielectric relaxation, concomitant with these structural modifications in BFTO at the same temperatures. Further, employing complementary experimental methods, it is shown that the distribution of Fe/Ti ions in BFTO is random. With the help of techniques that probe magnetism at various length and time scales, it is shown that the phase-pure BFTO is non-magnetic down to the lowest temperatures.
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页数：11
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