Identifying the nature of dielectric anomalies in SrFeO3-δ

被引：2

作者：

Aich, Payel ^{[1
]}

Fu, Desheng ^{[2
,3
]}

Meneghini, Carlo ^{[4
]}

Ray, Sugata ^{[1
]}

机构：

[1] Indian Assoc Cultivat Sci, Sch Mat Sci, 2 A&B Raja SC Mullick Rd, Kolkata 700032, India

[2] Shizuoka Univ, Grad Sch Sci & Technol, Dept Elect & Mat Sci, Naka Ku, 3-5-1 Johoku, Hamamatsu, Shizuoka 4328561, Japan

[3] Shizuoka Univ, Grad Sch Sci & Technol, Dept Optoelect & Nanostruct Sci, Naka Ku, 3-5-1 Johoku, Hamamatsu, Shizuoka 4328561, Japan

[4] Univ Roma Tre, Dipartimento Sci, Via Vasca Navale 84, I-00146 Rome, Italy

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2019年 / 486卷

关键词：

Mixed phase; Dielectric; Phase transition; Anion doping; SYSTEM; OXYFLUORIDE; BEHAVIOR;

D O I：

10.1016/j.jmmm.2019.165265

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Earlier comprehensive study of SrFeO3-delta series of compounds showed interplay between the oxygen vacancy and the magnetic and transport properties of the system. We have synthesized a powder sample of SrFeO3-delta series with oxygen vacancy in the range 0.15 <= delta <= 0.19. X-ray powder diffraction confirms the tetragonal crystal structure of the compound while the magnetic data indicates the presence of response from both orthorhombic (Sr4Fe4O11) and tetragonal (Sr8Fe8O23) phases which is common for the series with intermediate compositions. The temperature dependent dielectric measurements have been carried out in the 10 kHz-1 MHz frequency range. The dielectric constant and loss are found to be nearly temperature independent for Delta T similar to 170 K around room temperature. This temperature independent response could possibly be referred to as 'flat loss' corresponding to a low loss behavior, making the compound a potential candidate to capacitor industry. The anion stoichiometry has been further manipulated by introducing a more electronegative fluoride anion in the vacant oxygen sites where the structure changes to cubic one at room temperature.

引用

页数：7

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