The Effect of Co Substitution on the Crystal Structure and Electrical Resistivity of (La0.85Ag0.15)MnO3 Compounds

Srivastava, S. K.; Ravi, S.

doi:10.1007/s10948-009-0456-y

Cited by 16 publications

(1 citation statement)

References 73 publications

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“…Mixed valence perovskite manganites with general formula RE1-xAxMnO3 (where RE= Pr, Nd, La; and A= Ca, Sr, Ba) received noticeable attention due to varieties of physical and chemical properties as well as potential applications in technology such as magnetic sensor, magnetic recording, etc [1][2][3]. The Pr-based manganites have been studied widely as they exhibit charge ordering (CO) which can be destabilized or destruct in order to tune the physical properties [4] and Pr0.75Na0.25MnO3 has caught attention as this compound is CO insulator at relatively high temperature, TCO ~ 220 K compared to antiferromagnetic interaction with Neel temperature, TN ~ 180 K [5,6].…”

Section: Introductionmentioning

confidence: 99%

Crystalline Phase, Surface Morphology and Electrical Properties of Monovalent Doped Pr0.75Na0.25Mn1-yCoyO3 Ceramics

Mannan¹,

Shamsuddin²,

Noh³

et al. 2018

IJCRSET

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This paper reports effects of cobalt (Co) doped at Mn-site of Pr0.75Na0.25Mn1-yCoyO3 (y = 0, 0.02 and 0.05) on structure and electrical properties along with the surface morphology. All the samples were synthesized using standard solid state reaction method. Powder X-ray diffraction measurement shows that all samples were crystallized in an orthorhombic structure with Pnma space group. The unit cell volume was decreased suggestively due to the different ionic radius between Mn and Co as Co increases. Resistivity measurement shows that the y = 0 sample exhibits an insulating behavior down to lower temperature and interestingly the metal-insulator (MI) transition was found at 108 K and 84 K for y = 0.02 and y = 0.05 respectively. The shifting of the MI transition to lower temperature indicates a weakening of the doubleexchange mechanism. On the other hand, scanning electron microscope (SEM) measurement showed that a different surface morphology was observed for all samples. A different pattern of grain boundaries was observed with increasing of Co content. Grains connection of y = 0 samples was observed slightly denser compare to the y = 0.02 and 0.05 samples in conjunction with incerasing of the value of porosity. This can be suggested due to the successful of doping of Co ions in the compound.

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