NDLI: Rietveld analysis, dielectric and impedance behaviour of Mn$^{3+}$/Fe$^{3+}$ ion-modified Pb(Zr$_{0·65}$Ti$_{0·35}$)O$

Content Provider	Springer Nature Link
Author	SAHU, NIRANJAN
Copyright Year	2013
Abstract	The polycrystalline samples of Pb(Zr$_{0·65 − x }$A$_{ x }$Ti$_{0·35}$)O$_{3}$ (A = Mn/Fe), (x =0·00, 0·05) (PZM/FT) were synthesized by conventional solid-state reaction technique. X-ray diffraction (XRD) pattern was recorded at room temperature and the samples were found in single phase form. All the observed peaks could be indexed to R3c space group with rhombohedral symmetry. XRD pattern has been analysed by employing Rietveld method with the help of FullProf Program. The lattice parameters and unit cell volumes decrease from Mn$^{3 + }$ to Fe$^{3 + }$ ion concentrations. The bond lengths and angles have been calculated by using Powder Cell Programme. Microstructural analysis of the surface of the ceramic compound by scanning electron microscopy (SEM) exhibits that there is a significant change in grain size on introduction of Mn$^{3 + }$ and Fe$^{3 + }$ ions at the Zr-site of the compound. It is observed that both the substitutions (Mn$^{3 + }$ and Fe$^{3 + }$) at Zr site induce an increase in dielectric constant and a shift in Curie temperature (T $_{ c }$). From a.c. conductivity analysis, we have estimated the activation energy for both ferroelectric and paraelectric regions. Both the modified samples are obeying Jonscher power law. From Nyquist plots, the activation energy of grain resistance, relaxation time and bulk conductivity are compared. The grain resistance of the material decreases with rise in temperature which indicates a semiconducting behaviour of the material.
Starting Page	699
Ending Page	708
Page Count	10
File Format	PDF
ISSN	02504707
Journal	Bulletin of Materials Science
Volume Number	36
Issue Number	4
e-ISSN	09737669
Language	English
Publisher	Springer India
Publisher Date	2013-08-08
Publisher Institution	Indian Academy of Sciences
Publisher Place	India
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ceramics X-ray diffraction crystal structure dielectric properties electrical conductivity Nyquist plots Materials Science Engineering
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Materials Science

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