Ferroelectrics
The Effect of Excessive Sm3+ doping on the Ferroelectric properties of Lead Zirconate Titanate Ceramics
T. Anil Babu*, K.V. Ramesh+, V.Raghavendra Reddy@ and D.L. Sastry*
* Physics Department, Andhra University, Visakhapatnam – 530 003 (AP)
+ Department of Engineering Physics, GITAM University, Visakhapatnam – 530 045(AP)
@ UGC-DAE Consortium for Scientific Research, University Campus, Indore-(MP)
Email: dl_sastry@yahoo.com
Abstract. Polycrystalline samples of Sm modified Pb Zrx Ti(1-x) O3 [PZT] ceramics ( where x = 0.6,0.7,0.8,0.9) have been prepared by a high energy ball milling technique, which was followed by calcination at 9500 C and sintering at 11500 C. As Sm3+ concentration is increased more than 0.1 mole% considerable pyrochlore phase has been formed. This phase has been identified as Sm2Ti2O7 from its X-ray diffraction peaks. X-ray diffraction (XRD) and Scanning electron mcroscopy (SEM) studies have been carried out to determine the structural phase and morphological modifications that occur with the change in Zr/Ti ratio. The ferroelectric phase transition temperature (Tc) decreases and increases where as the dielectric constant (ε’) increases and decreases. The saturation polarization Ps (μc/cm2), remnant polarization Pr (μc/cm2) and coercive field Ec (kv/cm) values of the perovskite in the presence of the pyrochlore are presented.
Key Words: Ferroelectric Properties, Dielectric Constant, Sm3+ doping, Lead Zirconium Titanate, Pyrochlore PACS: 77.80.-e, 77.80.B-, 77.22.-d; 77.80dj; 77.84Cg.
Introduction
LEAD ZIRCONATE TITANATE IS A PEROVSKITE MATERIAL OF ABO3 STRUCTURE WITH SEVERAL APPLICATIONS SUCH AS ACTUATORS, TRANSDUCERS, PYROELECTRIC DETECTORS, ELECTROOPTIC MODULATORS, RANDOM ACCESS MEMORIES ETC. IT IS A SOLID SOLUTION OF FERROELECTRIC PBTIO3 AND ANTIFERROELECTRIC PBZRO3 WITH A MORPHOTROPIC PHASE BOUNDARY EXISTING AT ZR/TI RATIO OF 48/52. THE MATERIALS HAVE VERY INTERESTING PHYSICAL PROPERTIES AT THE
T. Anil Babu*, K.V. Ramesh+, V.Raghavendra Reddy@ and D.L. Sastry*
* Physics Department, Andhra University, Visakhapatnam – 530 003 (AP)
+ Department of Engineering Physics, GITAM University, Visakhapatnam – 530 045(AP)
@ UGC-DAE Consortium for Scientific Research, University Campus, Indore-(MP)
Email: dl_sastry@yahoo.com
Abstract. Polycrystalline samples of Sm modified Pb Zrx Ti(1-x) O3 [PZT] ceramics ( where x = 0.6,0.7,0.8,0.9) have been prepared by a high energy ball milling technique, which was followed by calcination at 9500 C and sintering at 11500 C. As Sm3+ concentration is increased more than 0.1 mole% considerable pyrochlore phase has been formed. This phase has been identified as Sm2Ti2O7 from its X-ray diffraction peaks. X-ray diffraction (XRD) and Scanning electron mcroscopy (SEM) studies have been carried out to determine the structural phase and morphological modifications that occur with the change in Zr/Ti ratio. The ferroelectric phase transition temperature (Tc) decreases and increases where as the dielectric constant (ε’) increases and decreases. The saturation polarization Ps (μc/cm2), remnant polarization Pr (μc/cm2) and coercive field Ec (kv/cm) values of the perovskite in the presence of the pyrochlore are presented.
Key Words: Ferroelectric Properties, Dielectric Constant, Sm3+ doping, Lead Zirconium Titanate, Pyrochlore PACS: 77.80.-e, 77.80.B-, 77.22.-d; 77.80dj; 77.84Cg.
Introduction
LEAD ZIRCONATE TITANATE IS A PEROVSKITE MATERIAL OF ABO3 STRUCTURE WITH SEVERAL APPLICATIONS SUCH AS ACTUATORS, TRANSDUCERS, PYROELECTRIC DETECTORS, ELECTROOPTIC MODULATORS, RANDOM ACCESS MEMORIES ETC. IT IS A SOLID SOLUTION OF FERROELECTRIC PBTIO3 AND ANTIFERROELECTRIC PBZRO3 WITH A MORPHOTROPIC PHASE BOUNDARY EXISTING AT ZR/TI RATIO OF 48/52. THE MATERIALS HAVE VERY INTERESTING PHYSICAL PROPERTIES AT THE
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