ABSTRAKBarium Stronsium Titanat (Ba1-xSrxTiO3) telah disintesis menggunakanmetode reaksi padatan. Material dasar yang berupa BaCO3, SrCO3, dan TiO2dicampur, di-press, dibentuk bulk, dan di-sintering pada suhu 1200oC selama 2jam. Variasi komposisi Sr (x) dan waktu pencampuran dilakukan untukmengetahui pengaruhnya terhadap karakteristik Ba1-xSrxTiO3. Variasi komposisiSr (x) yang digunakan sebesar x=0; x=0,1; dan x=0,5 dan waktu pencampurandilakukan selama 6 jam dan 8 jam. Sampel (Ba1-xSrxTiO3) diuji menggunakaninstrument X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM),Inductance Capacitance Resistance (LCR) meter, dan rangkaian Sawyer Tower.Hasil XRD menunjukkan bahwa komposisi menyebabkan sudut difraksi bergesermenjadi lebih besar dan waktu pencampuran menyebabkan perubahan padaintensitas puncak-puncak Ba1-xSrxTiO3. Hasil morfologi SEM menunjukkanbahwa komposisi menyebabkan perubahan pada ukuran butir Ba1-xSrxTiO3, dansemakin lama waktu pencampuran menyebabkan ukuran butir semakin besar.Hasil pengujian menggunakan rangkaian Sawyer Tower menunjukkan bahwaBaTiO3 dan Ba0,9Sr0,1TiO3 bersifat feroelektrik, sedangkan Ba0,5Sr0,5TiO3 bersifatparaelektrik. Hasil LCR meter menunjukkan bahwa konstanta dielektrikcenderung semakin rendah seiring dengan semakin banyaknya komposisi Sr, danperbedaan waktu pencampuran juga menyebabkan konstanta dielektrik (Ba1-xSrxTiO3) berubah. Konstanta dielektrik tertinggi diperoleh pada Ba0,9Sr0,1TiO3dengan waktu pencampuran 8 jam, yaitu sebesar 196.Kata kunci : Barium Stronsium Titanat (Ba1-xSrxTiO3), metode reaksi padatan,konstanta dielektrik, feroelektrikABSTRACTBarium Strontium Titanate (Ba1-xSrxTiO3) or BST has been synthesizedusing Solid State Reaction method. Raw materials are BaCO3, SrCO3, and TiO2.Those materials are mixed, pressed, and sintered at temperature 1200oC for 2hours. Mole composition of Sr (x) and mixing time of raw materials were assortedto study its effects on structural, morphological, and electrical properties of BST.Variation of Sr (x) in BST are x=0; x=0.1; and x=0.5 with mixing time for 6 h and8 h for each x variation. Samples of BST were characterized by X-Ray Diffraction(XRD), Scanning Electron Microscopy (SEM), Inductance CapacitanceResistance (LCR) meter, and Sawyer Tower circuit. XRD patterns showed that xvariations can cause the diffraction angle shift to right side (angle larger) as theincreases of x. In addition mixing time of BST causes a change in the intensitypeaks of diffraction patterns. SEM images showed that the composition of xcauses a change in BST grain size, and the longer mixing time causes the grainsize increases. The results of characterization using Sawyer Tower circuitconfirmed that BaTiO3 and Ba0.9Sr0.1TiO3 is ferroelectric, while Ba0.5Sr0.5TiO3 isparaelectric. LCR meter results indicated that the dielectric constant tends to belower as the x increases, and the difference of mixing time also causes thedielectric constant of Ba1-xSrxTiO3 changes. The highest dielectric constant was196 at Ba0.9Sr0.1TiO3 with mixing time of 8 h.Keyword : Barium Strontium Titanate (Ba1-xSrxTiO3), solid state reaction method,dielectric constant, ferroelectric.