Pyroelectric and dielectric properties of lead-free ferroelectric Ba3Nb2O8 ceramic

作者：Pati Biswajit; Choudhary R N P^*; Das Piyush R; Parida B N; Padhee R

来源：Journal of Alloys and Compounds, 2014, 592: 6-11.

DOI：10.1016/j.jallcom.2013.12.241

• Ferroelectrics
• Powder metallurgy
• Dielectric response
• Phase transitions
• Electrical transport
• X-ray methods

The present study highlights ferroelectric phase transition, dielectric, pyroelectric properties and conduction mechanism of highly crystallized barium orthoniobate (Ba3Nb2O8) ceramic, prepared by a solid-state reaction technique. X-ray diffraction studies show the formation of a single-phase compound in hexagonal crystal system. Detailed studies of dielectric parameters (epsilon(r) and tan delta) of the compound as a function of temperature and frequency reveal their independence over a wide range of temperature and frequency. An anomaly in epsilon(r) suggests the possible existence of a ferroelectric-paraelectric phase transition of diffuse-type in the material. The low dielectric loss and moderate relative permittivity make this material (with certain modification) a potential candidate for microwave applications. Studies of pyroelectric properties reveal that the materials have reasonably high figure of merit useful for fabrication of pyroelectric detectors. The low-leakage current and negative temperature coefficient of resistance (NTCR) behavior of the sample have been verified from J-E plots. The nature of variation of dc conductivity with temperature confirms the Arrhenius and NTCR behavior of the material.

• 出版日期2014-4-15