Electrical properties and impedance spectroscopy of lithium modified potassium sodium niobate ceramics
Ferroelectrics, cilt.447, sa.1, ss.95-107, 2013 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 447 Sayı: 1
- Basım Tarihi: 2013
- Doi Numarası: 10.1080/00150193.2013.821914
- Dergi Adı: Ferroelectrics
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Sayfa Sayıları: ss.95-107
- Anahtar Kelimeler: Curie temperature, dielectric properties, impedance spectroscopy, Lead-free, Li-modified KNN
- Maltepe Üniversitesi Adresli: Evet
Özet
Lead-free potassium sodium niobate (KNN) ceramics were prepared with lithium and tantalum modification. Structural properties were investigated. Impedance spectroscopy was used as a tool to analyze electrical behavior of ceramics as a function of frequency from 100 Hz to 10 MHz at a temperature range from 573 K to 798 K. Neither Li nor Li + Ta modification caused any secondary grain boundary phase, however both of them caused a densification of the ceramic. Increasing the lithium addition was found to decrease the impedance, while the Li + Ta addition drastically increased it. Finally, a temperature induced relaxation process was observed in the samples with the relaxation frequency shifting with temperature. © 2013 Copyright Taylor and Francis Group, LLC.