Dibyaranjan Mallick; Ravi Prakash;Davinder Kaur; Rahul Barman; Kirandeep Singh
Abstract
In this study, the bipolar resistive switching behavior of Pulsed Laser Deposited Zn1-xMgxO (x= 0, 0.1) thin films in Ag/Zn1-XMgxO/Cu structure has been investigated. The XRD pattern of Zn1-XMgxO exhibits the presence of (002) and (103) reflection. The cross-sectional field emission scanning electron ...
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In this study, the bipolar resistive switching behavior of Pulsed Laser Deposited Zn1-xMgxO (x= 0, 0.1) thin films in Ag/Zn1-XMgxO/Cu structure has been investigated. The XRD pattern of Zn1-XMgxO exhibits the presence of (002) and (103) reflection. The cross-sectional field emission scanning electron microscopy (FE-SEM) studies were further carried out to examine the thickness of the film. In order to analyze the bipolar resistive switching behavior of the Zn1-xMgxO thin films, an I-V measurement was performed at room temperature. The memory cell Ag/Zn0.9Mg0.1O/Cu exhibits set voltage (ON state) at 2.57V and reset voltage (OFF state) at -3.15 V, excellent OFF to ON resistance ratio (~10 5 ) for 200 DC sweep cycles and exhibits good retention (>10 3 s). The physical mechanism responsible for exhibiting switching behavior in the Zn1-xMgxO thin films was explained by formation and rupture of the nano-scale conduction filament due to Oxygen vacancies. Ohmic conduction and Poole-Frenkel emission are responsible for current conduction in Low Resistance State (LRS) and High Resistance State (HRS) regions respectively. Enhanced switching behavior is observed by substitution of Mg in ZnO thin film. Nonvolatile two resistance states of the Zn1-XMgxO thin film could prove useful in future power efficient memory devices.
K.C. Anjaneya; J. Manjanna; V.M. Ashwin Kumar; H.S. Jayanna; C.S. Naveen
Abstract
We report the nature of rare earth ion doped ceria (REC), Ce0.8Ln0.2O2−δ, (Ln = Y 3+ , Gd 3+ , Sm 3+ , Nd 3+ and La 3+ ) as oxide ion conductors for their plausible application as electrolytes in intermediate temperature solid oxide fuel cell (SOFC). The samples were prepared by citrate-complexation ...
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We report the nature of rare earth ion doped ceria (REC), Ce0.8Ln0.2O2−δ, (Ln = Y 3+ , Gd 3+ , Sm 3+ , Nd 3+ and La 3+ ) as oxide ion conductors for their plausible application as electrolytes in intermediate temperature solid oxide fuel cell (SOFC). The samples were prepared by citrate-complexation method and characterized by XRD, SEM/ EDX and UV-Visible spectra. The cubic fluorite-type crystal structure is confirmed from XRD patterns, and the observed lattice parameters are in agreement with calculated values. The UV-Vis spectra of the particles dispersed in aqueous medium showed absorption in the UV region which is ascribed to charge-transfer transition. The dc conductivities at 673 K are in the order of Ce0.8Sm0.2O2−δ > Ce0.8Gd0.2O2−δ > Ce0.8Y0.2O2−δ > Ce0.8Nd0.2O2−δ > Ce0.8La0.2O2−δ and their corresponding activation energies are 0.85, 0.87, 0.87, 0.88 and 0.95 eV. Based on ionic and electronic transference numbers, electrical conductivity obtained here is purely ionic, i.e., oxide ion conductors.
Nawnit Kumar; Patri Tirupathi; Bineet Kumar; Mukul Pastor; A. C. Pandey; R. N. P. Choudhary
Abstract
We reports structural, microstructural and dielectric characteristics of Sr 2+ doped PZT (50/50) ceramic. X-ray diffraction reveals that the system exhibit coexistence of two phases (Tetragonal and rhombohedral) at room temperature. Typical relaxor behavior was observed by the dielectric studies and ...
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We reports structural, microstructural and dielectric characteristics of Sr 2+ doped PZT (50/50) ceramic. X-ray diffraction reveals that the system exhibit coexistence of two phases (Tetragonal and rhombohedral) at room temperature. Typical relaxor behavior was observed by the dielectric studies and confirmed by Vogul-Fulcher fitting. The observed relaxor was predicted as existence of nanopolar regions due to short range ordering in presence of oxygen vacancies. The evidence for oxygen vacancies was studied by conductivity and polarization studies. Moreover, at 270 °C one more phase transition is noted which was ascribed to structural phase transition. Present study has scientific significance to distinguish the performance of oxygen vacancies in ferroelectric materials.
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