Synthesis and Characterization of PbZrTiO3 Ceramics
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1 Synthesis and Characterization of PbZrTiO3 Ceramics T Vidya Sagar, T Sarmash, M Maddaiah, T Subbarao To cite this version: T Vidya Sagar, T Sarmash, M Maddaiah, T Subbarao. Synthesis and Characterization of PbZrTiO3 Ceramics. Mechanics, Materials Science Engineering MMSE Journal. Open Access, 2017, 9, < /mmse >. <hal > HAL Id: hal Submitted on 10 Apr 2017 HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d enseignement et de recherche français ou étrangers, des laboratoires publics ou privés. Distributed under a Creative Commons Attribution 4.0 International License
2 Synthesis and Characterization of PbZrTiO3 Ceramics 62 T. Vidya Sagar 1,a, T. Sofi Sarmash 1, M. Maddaiah 1, T. Subbarao 1 1 Materials Research Laboratory, Dept. of Physics, Sri Krishna Devaraya University, Anantapur , India a tvidyasagar83@gmail.com DOI /mmse provided by Seo4U.link Keywords: lead zirconate titanate, dielectric constant, diffraction, ferroelectric material. ABSTRACT. Lead zirconate titanate (PZT) ceramic powders were prepared via conventional solid-state reaction method. The prepared samples were sintered at 900 o C for 2 h. The sintered materials were characterized for structural analysis. The diffraction pattern reveals the pure phase formation of perovskite PZT structure. The morphology is analyzed by scanning electron microscope and average grain size is evaluated to be of 3.3 μm. The frequency and temperature dependence of electrical properties such as dielectric constant and dielectric loss was studied using LCR controller. In addition, the ferroelectric behavior was investigated by P-E loop tracer. Introduction. Lead titanate is a ferroelectric ceramic material. It shows distinct applications in various fields and is used for non volatile memories, medical ultrasound imaging and actuators and data storage devices [1, 2]. The well populated applications of ferroelectric materials are observed in the fields of dielectrics for capacitor applications. In particular, these materials are candidates for ferroelectric thin film technology. The perovskite materials will have a general chemical formula of the type ABO3 [2]. Many ferroelectric materials such as; barium titanate (BaTiO3), lead titanate (PbTiO3), lead zirconate titanate (PZT), lead lanthanum zirconate titanate (PLZT), have this perovskite type structure. These materials can work as good dielectric materials. In addition, the barium titanate, strontium titanate, strontium copper titanate, strontium lanthanum titanate, strontium lead titanate, strontium zinc manganese titanate, strontium magnesium titanate and strontium bismuth titanate are investigated recently for the dielectric and ferroelectric properties by several researchers [3-9]. In the current study, the structure, morphology, dielectric and ferroelectric behaviour are discussed for PZT ceramics. Experimental Procedure. In this study the precursors are chosen as PbO, ZrO2 (99.6% purity, Sigma Aldrich), TiO2 (99.4% purity, Sigma Aldrich) to prepare the ferroelectric PZT ceramics. Initially, the raw materials are weighed and mixed uniformly according to their stoichiometric ratio. The mixed powder is ball milled for approximately 12 h using ball miller (Retsch PM200. Furthermore, the uniformly grounded powder is pre-sintered at 700 o C for 12 hr. The pre-sintered powder is again grounded for nearly 2 hr. The pellets of radius 0.58 cm and thickness cm are prepared after applying 2 ton pressure using hydraulic press. The pellets are sintered at 850 o C for 2 hr in conventional furnaces. Further, the pellets are characterized using XRD at room temperature (Bruker X-Ray Powder Diffract Meter, CuKα = nm), SEM (Hitachi: S-4700), LCR controller (Hioki ) and P-E loop measurement (Marine India) for structural, surface morphological, dielectric and ferroelectric properties respectively. Results and Discussions The Authors. Published by Magnolithe GmbH. This is an open access article under the CC BY-NC-ND license 358
3 Structural Analysis. The diffraction pattern of PZT ceramic powder is shown in Fig.1. It can be understood from figure that the formed single crystalline phases that belong to cubic perovskite structure of pure lead zirconate titanate. The maximum intense plane is noticed at the diffraction or two-theta angle of o. The value of lattice parameters c of PZT ceramic composition were found to be Å where as a = b is Å conforming the tetragonal perovskite structure. Furthermore, the average crystalline size (D) is calculated as 41.2 nm using the Scherer formula [10-13]. Fig. 1. PZT perovskite structure. Fig. 2. SEM image of PZT. Surface Morphology. The Scanning Electron Microscope (SEM) provides the surface morphology of powder specimen. It is seen from Fig. 2 that all the grains are of almost spherical in shape. The average grain size (Ga) is found to be 3.3 µm using linear intercept method using the following equation [14]. Ga=. (1) where L is the test line length, N is the number of intersecting grains and M is the magnification. SEM image of the PZT sample prepared is shown in Fig. 2. It contains well defined grains of spherical in shape. Moreover, an apparent porosity is observed to be very small. 359
4 Fig. 3. The Dielectric constant versus temperature plot. Fig. 4. The Dielectric loss versus temperature plot. Dielectric Properties. The variation of dielectric constant (ε') and loss (ε") of PbZrTiO3 is shown in Fig.3 and Fig. 4 respectively as a function of both frequency (100 Hz- 1 MHz) and temperature ( K). It is understood from the figures that the dielectric constant and loss were slowly increasing with increase of temperature up to 573 K and further a sharp increasing trend in both the cases was observed. The sharp increase is attributed to the interfacial or space-charge polarization effect. Similar trend is observed in the literature [15-18]. In addition, ε' and ε" were decreasing with increase of frequency. This was happened due to in effective space-charges at the grain boundary interface. At room temperature for frequency ~ 1 MHz the present specimen showed dielectric constant of ~15. The loss was also showing the similar trend as that of permittivity in all respects. But interestingly, loss versus temperature plot shows dielectric relaxations with increase of temperature. The relaxation is shifted towards the right. These relaxations are generally formed due to the presence of oxygen vacancies with temperature. The high loss of 14 is attributed at 1 MHz frequency. This kind of high ε' and high ε" values noticed at room temperature were most suitable for filter, charge stored capacitors and absorber applications. Ferroelectric properties. The ferroelectric behavior of PZT is investigated with the help of P-E loop tracer. While doing measurement the pellet is connected parallel to 2 µf capacitor for compensation. Fig. 5 depicts the ferroelectric hysteresis loops of PZT under an applied frequency of 600 Hz at an operating voltage of 600 V. It is understood from Fig.5 that the sample shows a well-behaved hysteresis loop distorted into banana shape performed at distinct temperatures such as 303K.. The response of dipoles per unit field is in general regarded as polarization. It is an observed fact that the saturation polarization (Ps) and remanance polarization (Pr) of PZT at all temperatures is found to be constant value of μc/cm 2 and coactivity field (Ec) is 0.79 Kv/Cm. 360
5 Fig. 5. PE loop of PZT Sample. Summary. Lead zirconate titanate (PZT) ceramic powders were prepared via conventional solid-state reaction method. The diffraction pattern reveals the pure phase formation of perovskite PZT structure. The average crystallite diameter is of 41.2 nm. The average grain size is evaluated to be of 3.3 micrometer. The high dielectric constant and high dielectric loss was observed for dielectric absorbers applications. The P-E loop analysis showed the highest Ps of 21.3 µc/cm 2 coactivity field (Ec) is 0.79 Kv/Cm. References [1] K.Chandra Babu Naidu, T.Sofi Sarmash, M.Maddaiah, A. Gurusampath Kumar, D. Jhansi Rani, V. Sharon Samyuktha, L. Obulapathi, T.Subbarao, Structural and electric properties of PbO- doped SrTiO3 Ceramics Journal of Ovonic research 11 (2015) [2] V. Narasimha Reddy, T. Sofi Sarmash, K. Chandra Babu Naidu, M. Maddaiah, T. Subbarao, Structural and Optical Properties of BaO-ZnO-TiO2 Ternary System, Journal of Ovonic Research 12 (2016) [3] K.Chandra Babu Naidu, T.Sofi Sarmash, V. Narasimha Reddy, M. Maddaiah, P. Sreenivasula Reddy, T.Subbarao, Structural, dielectric and electrical properties of La2O3 doped SrTiO3 ceramics, Journal of The Australian Ceramic Society, 51 (2015) [4] K. Chandra Babu Naidu, T.Sofi Sarmash, M.Maddaiah, P.Sreenivasula Reddy, D. Jhansi Rani T. Subbarao, Synthesis and Characterization of MgO doped SrTiO3 Ceramics, Journal of The Australian Ceramic Society 52 (2016) [5] K. Chandra Babu Naidu, T. Sofi Sarmash, V.Narasimha Reddy, M. Maddaiah and T. Subbarao, Structural and Dielectric Properties of CuO doped SrTiO3 Ceramics, American Institute of Physics proceedings 1665 (2015) ; doi: / [6] M. Maddaiah, A. G. Kumar, L. Obulapathi, T. S. Sarmash, K. Chandra Babu Naidu, D. J. Rani, T. S. Rao, Synthesis And Characterization Of Strontium Doped Zinc Manganese Titanate Ceramics digest journal of nanomaterials and biostructures, 10 (2015) [7] M.Maddaiah, K.Chandra Babu Naidu, D. Jhansi Rani, T. Subbarao, Synthesis and Characterization of CuO-Doped SrTiO3 Ceramics, Journal of Ovonic Research 11 (2015) [8] S. Anil Kumar and K.Chandra Babu Naidu, Structural and Dielectric Properties of Bi2O3 Doped SrTiO3 Ceramics, International Journal of ChemTech Research 9 (2016)
6 [9] V. Narasimha Reddy, K. Chandra Babu Naidu, T. Subba Rao, Structural, Optical and Ferroelectric Properties of BaTiO3 Ceramics, Journal of Ovonic Research 12 (2016) [10] D Jhansi Rani, A Guru Sampath Kumar, T Sofi Sarmash, K Chandra Babu Naidu, M Maddaiah, T Subba Rao, Effect of Argon/Oxygen Flow Rate on DC Magnetron Sputtered Nano Crystalline Zirconium Titanate Thin Films, Journal of the Minerals, Metals and Materials Society 68 (2016) [11] K. Chandra Babu Naidu and W. Madhuri, Microwave Processed NiMg Ferrites: Studies on Structural and Magnetic Properties, Journal of Magnetism and Magnetic Materials 420 (201) [12] K. Chandra Babu Naidu and W. Madhuri, Effect of non-magnetic Zn 2+ cations on initial permeability of microwave treated NiMg ferrites, International Journal of Applied Ceramic Technology 13 (2016) [13] S. Prathap, K. Chandra Babu Naidu, and W. Madhuri, Ferroelectric behaviour of Microwave sintered iron deficient PbFe12O19-δ, AIP Conference Proceedings 1731 (2016) ; doi: / [14] K. Chandra Babu Naidu and W. Madhuri, Microwave Assisted Solid State Reaction Method: Investigations on Electrical and Magnetic Properties NiMgZn Ferrites, Materials Chemistry and Physics 181 (2016) [15] K. Chandra Babu Naidu, S. Roopas Kiran and W. Madhuri, Microwave Processed NiMgZn Ferrites for Electromagnetic Interference Shielding Applications, IEEE Transactions on Magnetics (2016), DOI: /TMAG [16] K. Chandra Babu Naidu, W. Madhuri, Microwave Processed Bulk and Nano NiMg Ferrites: A Comparative Study on X-band Electromagnetic Interference Shielding Properties, Materials Chemistry and Physics 187 (2017) [17] K. Chandra Babu Naidu, W. Madhuri, Effect of Microwave Heat Treatment on Pure Phase Formation of Hydrothermal Synthesized Nano NiMg ferrites, Phase Transitions (2016), doi: / Cite the paper T. Vidya Sagar, T. Sofi Sarmash, M. Maddaiah, T. Subbarao (2017). Synthesis and Characterization of PbZrTiO3 Ceramics. Mechanics, Materials Science & Engineering, Vol /mmse
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