STUDI n-LAPIS OKTAHEDRAL TERHADAP SIFAT FEROELEKTRIK OKSIDA LOGAM AURIVILLIUS Sr(n-2)Bi3TinO(3n+3) (n = 3, 4, 5 dan 6)

Abstract

ABSTRAK Senyawa oksida logam berstruktur Aurivillius Sr(n-2)Bi3TinO(3n+3) (n = 3, 4, 5 dan 6) telah disintesis menggunakan metode hidrotermal pada suhu 200 °C, konsentrasi NaOH 3 M sebagai mineralizer, dan variasi waktu 48, 72, dan 96 jam. Penelitian ini bertujuan untuk mengetahui hubungan kausal antara jumlah lapis oktahedral dan sifat karakteristik oksida logam Aurivillius feroelektrik sebagai bahan kapasitor. Keempat oksida logam target sintesis dihasilkan produk sintesis dalam bentuk polikristalin berwarna putih. Analisis struktur mengunakan metode Le Bail menunjukkan bahwa parameter sel untuk oksida logam keempatnya bergeometri orthorombik, grup ruang A21am.. Namun berbeda ukuran parameter selnya, untuk SrBi3Ti3O13 (SBT 3 lapis) yaitu a = 5,0656 Å; b = 5,1774 Å; c = 30,2878 Å; Sr2Bi3Ti4O15 (SBT 4 lapis) yaitu a = 5,1453Å; b = 5,2455 Å; c = 35,54354 Å; Sr3Bi3Ti5O18 (SBT 5 lapis) yaitu a = 5,2674 Å; b = 5,2845 Å; c = 41,4432 Å dan Sr4Bi3Ti6O21 (SBT 6 lapis) yaitu a = 5,4800Å; b = 5,5643 Å; c = 45,4994 Å. Pengukuran sifat feroelektrik dari keempat oksida logam Aurivillius hasil sistesis menunjukan pola histerisis dengan nilai polarisasi remanen sangat besar adalah SBT tiga lapis 30,2 C/cm 2 ; SBT empat lapis 24,4 C/cm 2 ; SBT lima lapis 35,1 C/cm 2 dan SBT enam lapis 27,8 C/cm 2. Berdasarkan pola histerisis sifat feroelektrik keempat oksida logam target bertambah besar Pr(+) polarisasi remanen dengan bertambahnya jumlah lapis oktahedral, bahkan teridentifikasi bahwa jumlah lapis oktahedral dengan jumlah ganjil lebih besar dibanding dengan n oktahedral genap Kata Kunci: Aurivillius, hidrotermal, polarisasi, feroelektrik, kapasitor ABSTRACT Compound metal oxide structure Aurivillius Sr(n-2)Bi3TinO(3n + 3) (n = 3, 4, 5 and 6) have been synthesized using hydrothermal method at 200 °C, the concentration of NaOH 3 M as mineralizer, and the variation 48 , 72, and 96 hours. This study aims to determine the causal relationship between the number of octahedral layers and characteristic properties of metal oxides as Aurivillius ferroelectric capacitor materials. Fourth synthesis of metal oxide targets produced synthetic products in the form of white polycrystalline. Analysis of the structure using the Le Bail method showed that the cell parameters for a fourth metal oxide geometries orthorombik, the space group A21am.. However, different sizes cell parameters, for SrBi3Ti3O13 (SBT 3 layers), namely a = 5.0656 Å; b = 5.1774 Å; c = 30.2878 Å; Sr2Bi3Ti4O15 (SBT 4 layers) is a = 5,1453Å; b = 5.2455 Å; c = 35.54354 Å; Sr3Bi3Ti5O18 (SBT 5 layers) is a = 5.2674 Å; b = 5.2845 Å; c = 41.4432 Å and Sr4Bi3Ti6O21 (SBT 6 layers), namely a = 5,4800Å; b = 5.5643 Å; c = 45.4994 Å. Measurement properties of ferroelectric Aurivillius fourth metal oxide synthesis results showed a pattern of hysteresis with very large remanent polarization values are SBT three layers of 30.2 C/cm 2 ; SBT four layers of 24.4 C/cm 2 ; SBT five layers of 35.1 C/cm 2 and SBT six layers of 27.8 C/cm 2. Based on the pattern of the fourth ferroelectric hysteresis properties of the metal oxide targets grew Pr (+) remanent polarization with increasing number of octahedral layers, even the research identified that the number of octahedral layers with an odd number greater than the number of octahedral even.