http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Anupama Sachdeva,Aarushib,Jagneet Kaur Anand,R. P. Tandon 한양대학교 세라믹연구소 2022 Journal of Ceramic Processing Research Vol.23 No.1
Calcium modified lead zirconate titanate ceramic compositions Pb(1-x)CaxZr0.52Ti0.48O3, where x=0, 0.02, 0.04, 0.06, 0.08, 0.1,have been prepared by solid state reaction method using wet milling. Scanning Electron Microscopy (SEM) studies have beencarried out to see the variation in the grain size with calcium addition. A correlation of the dielectric constant and dielectricloss with grain size effect is presented in this paper. A monotonic decrease in the transition temperature along with morediffuseness in paraelectric-ferroelectric phase transition is observed with increasing calcium content. The values of activationenergy (Ea) for the samples, calculated for ferroelectric region near phase transition temperature, are found to be in the rangeof approximately 0.6-1.0 eV which reflects that the main charge carriers responsible for conduction at higher temperaturesare oxygen ion vacancies.
Anupama Sachdeva,Aarushi,Jagneet Kaur Anand,R.P. Tandon 한양대학교 청정에너지연구소 2022 Journal of Ceramic Processing Research Vol.23 No.6
Pb(1-x)CaxZr0.52Ti0.48O3 bulk ceramic compositions where x=0-0.1 in steps of 0.02 are prepared by solid state reaction methodand sol-gel technique. A comparative study on the samples is conducted using XRD and Raman Spectroscopy in order to seethe effect of processing conditions. XRD peaks are indexed as per monoclinic phase. In both the series of samples, volumeshrinkage of the unit cell is observed in calcium modified samples when compared with unmodified samples. It is interestingto note that the samples derived from solid state reaction exhibit pseudo tetragonal structure while sol-gel derived samplesshow pseudo rhombohedral structure of their monoclinic unit cell. Similar inference has been made via Raman spectroscopystudies on the studied ceramic compositions prepared via two methods. Raman spectroscopy also reveals the possibility thatcalcium substitutes for lead.