PREPARATION OF BA2 TI9 O2O PERVOSKITE CERAMIC MATERIALS FOR MICROWAVE APPLICATION

MOST OF THE METHODS DEALING WITH THE SYNTHESIS OF BA2 TI9 O2O MENTIONED IN THE LITERATURE WERE TRIED. UNFORTUNATELY NO POSITIVE RESULTS WERE ACHIEVED. A NOVEL METHOD WAS SUGGESTED AND TRIED IN THE PRESENT WORK. THUS METHOD IS BASED ON WANG ET AL.[1] DESCRIBED BUT WAS MODIFIED. [1) S.F. WANG, C.K. YANG, C.C. CHIANG AND S.H.Y. TSAI ? EFFECT OF ADDITIVES ON THE PHASE FORMATION AND MICROSTRUCTURAL EVOLUTION OF BA2 TI9020 MICROWAVE CERAMIC? CERAMIC INTERNATIONAL, 29, 77-81, 2003. SEVERAL ATTEMPTS WERE TRIED AND TAKING INTO CONSIDERATION ,THE DIFFERENT FACTORS AFFECTING THE PREPARATION OF MICROWAVE CERAMIC MATERIALS ,SUCH AS PARTICLE SIZE, TEMPERATURE AND TIME OF REACTION AND THEIR STEPS O FIRING INCLUDING A CALCINATION STEP, AND A SINTERING STEP. X-RAY DIFFRACTION (XRD) WAS USED TO FOLLOW UP THE RESULT OF ALL STEPS ACCORDING TO THE RESULTS OBTAINED WE SHOWED THAT, THE SINTERING TEMPERATURE AND TIME OF CALCINATION HAVE SIGNIFICANT EFFECT ON XRD CRYSTALLINE PHASE DEVELOPMENT. ZIRCON OXIDE(ZR02) DOPED (ZBT) (BA2 TI9 O20AND UNDOPED (BA2 TI9 020)(BT) ARE SINTERED AT 1200-1300 FOR 2-5H SYNTHESIS BY THE FIRST NOVEL METHOD, INHIBITS THE FORMATION OF (BA2 TI9 020) CRYSTALLINE PHASE , BUT LED TO FORMATION OF BA TI4 09 AS MAJOR PHASE WITH BA TI2 05 AS MINOR PHASES IN BT. THE SECOND NOVEL METHOD, BA2 I9O20 IS THE MAJOR PHASE FOR BOTH ZBT AND BT SINTERED AT 1200 -1350 C AND FOR 2-5H IN ADDITION BATI8 016 AND BA2TI12 022 PHASES FOR ZBT AND BT RESPECTIVELY