Sains Malaysiana 48(2)(2019): 425–433

http://dx.doi.org/10.17576/jsm-2019-4802-21

 

Penentuan Parameter Optimum bagi Rawatan Pengutuban Elektrik ke atas Seramik-Piezo Barium Titanat (BaTiO3) menggunakan Sistem Buatan Sendiri

(Determination of Optimum Parameter for Electrical Poling Treatment on BaTiO3 Piezo-Ceramic using Home-Built System)

 

NOR HUWAIDA BINTI JANIL @ JAMIL1, MOHAMMAD HAFIZUDDIN BIN HJ JUMALI1*, ZALITA BINTI ZAINUDDIN1, IZURA BINTI IZZUDDIN1 & SOODKHET POJPRAPAI2

 

1Pusat Pengajian Fizik Gunaan, Fakulti Sains dan Teknologi, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

 

2Pusat Kejuruteraan Seramik, Institut Kejuruteraan, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand

 

Diserahkan: 18 Julai 2018/Diterima: 9 Oktober 2018

 

ABSTRAK

Kajian ini dijalankan bertujuan untuk menentukan nilai optimum bagi parameter rawatan pengutuban BaTiO3 sebagai bahan seramik-piezo dengan menggunakan sistem pengutuban DC buatan sendiri. Tiga parameter pengutuban utama yang telah dikaji adalah medan elektrik (Ep), suhu (Tp) dan masa (tp) rawatan. Fasa tunggal seramik-piezo BaTiO3 yang stabil dalam struktur hablur tetragon berjaya disediakan melalui persinteran keadaan pepejal konvensional. Pemilihan julat Ep dan Tp untuk rawatan pengutuban masing-masing adalah berdasarkan ujian awal pengukuran histeresis feroelektrik dan penentuan suhu Curie, Tc. Keputusan kajian mendapati BaTiO3 mempunyai nilai medan paksaan, Ec yang kecil (~2.42 kV/cm), pengutuban baki, Pr ~4.90 μC/cm2 dan pengutuban maksimum, Pm yang besar (~17.59 μC/cm2) dengan Tc pada 139°C. Berdasarkan julat parameter kajian, nilai pemalar piezoelektrik, d33 tertinggi ~190 pC/N diperoleh dengan magnitud medan elektrik pengutuban iaitu 1.5Ec pada suhu 60°C selama 10 min. Struktur dan morfologi BaTiO3 selepas rawatan pengutuban juga dikaji. Sistem pengutuban yang dibangunkan menyusun semula penjajaran domain secara efektif dan parameter rawatan optimum didapati setanding dengan kajian BaTiO3 lain.

 

Kata kunci: BaTiO3; feroelektrik; piezoelektrik; seramik bebas plumbum

 

ABSTRACT

This study has been conducted to determine the optimum value for poling treatment parameters of BaTiO3 as piezo-ceramic material using a home-built DC poling system. The three main poling parameters that has been studied were electric field (Ep), temperature (Tp) and time (tp) treatments. Single phase BaTiO3 piezo-ceramic stabilized in tetragonal structure was successfully prepared using conventional solid-state sintering. The selection range of Ep and Tp for poling treatment were based on prior ferroelectric hysteresis measurement and determination of Curie temperature, Tc tests, respectively. The results showed that BaTiO3 has low coercive field, Ec (~2.42 kV/cm), remanent polarization, Pr ~4.90 μC/cm2 and large maximum polarization, Pm (~17.59 μC/cm2) values with Tc of 139°C. Based on the studied parameter ranges, the highest piezoelectric constant, d33 value ~190 pC/N was obtained with poling electric field magnitude of 1.5Ec at 60°C for 10 min. Structure and morphology BaTiO3 after poling treatment were also investigated. Developed poling system effectively reorient the domain alignments and the optimum treatment parameters were comparable with other BaTiO3 studies.

 

Keywords: BaTiO3; ferroelectric; lead-free ceramics; piezoelectric

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*Pengarang untuk surat-menyurat; email: hafizhj@ukm.edu.my

 

 

 

 

 

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