Crystal structure and electrical properties of (1-x)(ba0.85sr0.15)tio3-x(k0.5na0.5)nbo3 system

Umi Nuraini, Yhuanita Nurul Kaukaba, Mashuri, Suasmoro*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


The composition of (1-x)(Ba0.85Sr0.15)TiO3 – x(K0.5Na0.5)NbO3 (BST-KNN) for x= 0.1 and x= 0.2 were successfully prepared by two separate synthesis namely oxalate co-precipitation (for BST) and solid-state reaction (for KNN). Sintered pellet at 1200°C for 2h exhibits a single phase except for x= 0.2 showing a secondary phase which was identified as Ba2TiO4. KNN doped BST system show tetragonal symmetry in which higher dopant expand its tetragonality (c/a). The densities of sintered samples deduced by Archimedes method are slightly higher than 90%. Permittivity measurements as function of temperature show almost similar TC= 90°C at frequency of 1.273 kHz and shift to higher temperature as frequency increases indicating a typical relaxor characteristics. At room temperature the relative permittivity showing Debye relaxation characteristic with ωr= 12560 (x= 0.1) and ωr= 20096 (x= 0.2). Furthermore, as function of temperature the activation energy deduced from relaxation time was obtained to be Ea= 0,564 eV for x= 0.1 and 0,58 eV for x=0.2.

Original languageEnglish
Title of host publicationFunctional Properties of Modern Materials II
Editors Darminto, Budhy Kurniawan, Risdiana, Isao Watanabe, Agustinus Agung Nugroho
PublisherTrans Tech Publications Ltd
Number of pages6
ISBN (Print)9783035714968
Publication statusPublished - 2019
Event4th International Conference on Functional Materials Science, ICFMS 2018 - Bali, Indonesia
Duration: 13 Nov 201815 Nov 2018

Publication series

NameMaterials Science Forum
Volume966 MSF
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752


Conference4th International Conference on Functional Materials Science, ICFMS 2018


  • Crystal structure
  • Defect Structure
  • Ferroelectric-Relaxors


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