Structural, dielectric, thermal and electrical characteristics of lead-free double perovskite: BiHoZnCeO 6
- PDF / 5,866,422 Bytes
- 13 Pages / 595.276 x 790.866 pts Page_size
- 13 Downloads / 144 Views
Structural, dielectric, thermal and electrical characteristics of lead‑free double perovskite: BiHoZnCeO6 Minakshi Padhy1 · Sujit Kumar Dehury2 · R.N.P. Choudhary3 · P. Ganga Raju Achary1 Received: 21 March 2020 / Accepted: 24 July 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract BiHoZnCeO6, the double pervoskite was synthesized using a cost-effective solid-state reaction method. The structural evaluation of the double pervoskite, when carried out by using the X-ray diffraction pattern suggested an orthorhombic crystal geometry with non- centrosymmetry space group Pca21. The microstructural investigation on the above material is carried out with the help of a scanning electron micrograph. These SEM micrographs showed that the grains of varying sizes (0.5–2 μm) are uniformly distributed. The study of dielectric characteristics as a function of temperature and frequency revealed some interesting characteristics of the material. One such observation is the identification of ferroelectric transition temperature at 435 °C. The strong anomaly at 435 °C and the ferroelectric behavior of the material is further validated by the study of spontaneous polarization (the hysteresis loop). In the present communication, the detailed microstructural, dielectric (dielectric constant, tangent loss, and electric polarization), thermal and electrical (impedance, electrical modulus, conductivity) studies on bismuth holmium zinc ceranate is presented along with the existence of ferroelectricity. Keywords Hysteresis loop · Double perovskites · Dielectric spectroscopy · Cerium · holmium
1 Introduction In the past few decades, the high dielectric constant and ferroelectric materials have drawn much attention of researchers for their applications. After the discovery of ferroelectricity in Rochelle salt [1], a good number of materials with excellent dielectric behavior were synthesized for the purpose, The ferroelectric materials are widely used in electronic devices, capacitors, and also in thermistors (like electro-optics and ultrasound devices). There is a high demand for the ferroelectric ceramic materials, because of their uses in the fabrication of non-volatile memories, energy storage, sensors, actuators, filters, infrared detectors, optical switches, etc. [2–6]. The main reasons for the necessity of these devices are (1) lack of * P. Ganga Raju Achary [email protected] 1
Department of Chemistry, Siksha ‘O’ Anusandhan (Deemed to be University), Khandagiri, Bhubaneswar 751030, India
2
P.G. Department of Chemistry, Vikram Deb (Autonomous) College, Jeypore 764001, India
3
Department of Physics, Siksha ‘O’ Anusandhan (Deemed to be University), Khandagiri, Bhubaneswar 751030, India
center of symmetry, (2) static dielectric constant above the transition temperature (Tc), (3) spontaneous polarization (4) pyroelectric effect, (5) piezoelectric effect, etc. The distinct behavior of ferroelectric materials is greatly influenced by the changes in the composition of the materials, chemically proc
Data Loading...
