ANALISA STRUKTUR DAN SIFAT LISTRIK LARUTAN PADAT Li, (Ba0.8Ca0.2)Tio3 DAN (Ba0.8Sr0.2)Tio3 PADA MATERIAL FEROELEKTRIK BEBAS TIMBAL (K0.5Na0.5)Nbo3

Agustinawati, Dian (2016) ANALISA STRUKTUR DAN SIFAT LISTRIK LARUTAN PADAT Li, (Ba0.8Ca0.2)Tio3 DAN (Ba0.8Sr0.2)Tio3 PADA MATERIAL FEROELEKTRIK BEBAS TIMBAL (K0.5Na0.5)Nbo3. Masters thesis, Institut Teknologi Sepuluh Nopember Surabaya.

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Abstract

Penelitian yang dilakukan bertujuan untuk mengetahui peranan Li, BCT dan BST terhadap struktur dan sifat listrik pada material ferroelektrik berbasis niobat (K0.5Na0.5)NbO3. Material KNN dan (K0.5Na0.4Li0.1)NbO3 disintesis dengan menggunakan metode reaksi padat sedangkan (K0,4Na0,4Ba0,16Ca0,04)(Nb0,8Ti0,2)O3 dan (K0,4Na0,4Ba0,16Sr0,04)(Nb0,8Ti0,2)O3 disintesis dengan menggunakan gabungan metode reaksi padat dan kopresipitasi oksalat. Serbuk KNN dikalsinasi pada temperatur 700oC/2jam, KNLN 750oC/2jam sedangkan KNN-BCT direkalsinasi pada temperatur 900oC/2jam dan KNN-BST 700oC/2jam. Bubuk hasil kalsinasi dan rekalsinasi selanjutnya dibentuk pelet dan disinter pada temperatur 1125oC/4jam untuk KNN, 1100oC/2jam untuk KNLN, 1100oC/6jam untuk KNN-BCT dan 1200oC/2jam untuk KNN-BST. Kajian meliputi analisis struktur kristal melalui difraksi sinar-X dan XANES, analisis mikrostruktur dengan SEM, dan analisis sifat listrik yang meliputi konstanta dielektrik dan impedansi kompleks dengan impedance analyzer. Dari hasil analisis XRD diketahui bahwa penambahan Li, BCT dan BST merubah struktur KNN dari perovskite orthorombik menjadi perovskite tetragonal. Ukuran rerata butir KNN dan KNLN adalah 1-1,2 μm. Dari analisis XANES diketahui penurunan intensitas ketika penambahan Li diberikan pada KNN menunjukkan adanya penurunan sifat metalik. Penambahan Li menyebabkan dielektrisitas dan suhu curie KNN meningkat sedangkan penambahan BCT dan BST menyebabkan turunnya dielektrisitas dan suhu curie KNN. ========================================================== Structure and electrical properties of Li, BCT and BST solid solution on lead-free ferroelectric material (K0.5Na0.5)NbO3 were characterized. Material KNN and (K0.5Na0.4Li0.1)NbO3 synthesized by using solid state reaction while (K0,4Na0,4Ba0,16Ca0,04)(Nb0,8Ti0,2)O3 and (K0,4Na0,4Ba0,16Sr0,04)(Nb0,8Ti0,2)O3 were synthesized using a combination of solid state reaction and coprecipitation oxalate method. KNN powder was calcined at a temperature of 700°C/2h, KNLN 750oC/2h while KNN-BCT was recalcined at a temperature of 900oC/2h and KNN-BST 700°C/2h. Recalcined and calcined powders were sintered at temperatures of 1125oC/4 h for KNN, 1100oC/2h for KNLN, 1100oC/6h for KNN-BCT and 1200oC/2h for KNN-BST. The analysis of crystal structure by X-ray diffraction and XANES, microstructure analysis by SEM, and analysis of electrical properties include dielectric constant and complex impedance by an impedance analyzer. From XRD pattern analysis was known that the addition of Li, BCT and BST changed the structure of perovskite orthorombik KNN into tetragonal perovskite. An average size of grain of KNN dan KNLN was 1-1.2 μm. From XANES analysis was known that decreasing of KNN intensity when addition of Li showed a decrease metallic properties. Li addition was caused dielectric properties and curie temperature of KNN increase while the addition of BCT and BST were caused a drop dielectric properties and curie temperature of KNN.

Item Type: Thesis (Masters)
Additional Information: RTFi 537.24 Agu a
Uncontrolled Keywords: Dielektrik, Bebas Timbal, Perovskite, Niobat
Subjects: Q Science > QC Physics > QC585 Dielectrics
Divisions: Faculty of Mathematics and Science > Physics > 45101-(S2) Master Thesis
Depositing User: EKO BUDI RAHARJO
Date Deposited: 29 Nov 2019 07:56
Last Modified: 29 Nov 2019 07:56
URI: http://repository.its.ac.id/id/eprint/72117

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