Electric, magnetic, and thermo-electric properties of Cr doped La0.8Ca0.2Mn1−Cr MnO3 manganites

Manjunatha, S.; Rao, Ashok; Babu, P. D.; Chand, Tara; Okram, G. S.

doi:10.1016/j.ssc.2016.04.012

Cited by 8 publications

(2 citation statements)

References 34 publications

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“…A MI transition at temperature 75 K was reported by x = 0.03 sample and increasing of Cr doped up to x≥0.05 was caused the MI transition to be disappeared suggestively due to reduction of DE mechanism [11]. Meanwhile, increasing of Cr doped up to x = 0.07 for La0.8Ca0.2Mn1−xCrxO3 compound caused a MI transition to shifted to lower temperature [12]. Thus, considering the entire study above, Cr doped at the Mn-site in Pr0.75Na0.25Mn1-…”

Section: Introductionmentioning

confidence: 90%

Enhancement of Double-Exchange Mechanism in Charge-Ordered Pr0.75Na0.25MnO3 Ceramics by Cr Doped at Mn-Site

Zawawi¹,

Ibrahim²,

Shamsuddin³

2018

IJCRSET

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Charge ordered Pr0.75Na0.25Mn1-xCrxO3 (x = 0-0.04) ceramics has been investigated to study the effect of Cr doping on structure and electrical transport properties as well as surface morphology which synthesized using the solid-state reaction method. X-ray diffraction (XRD) analysis revealed the crystalline phase of all samples consists of essentially single phase and crystallized in an orthorhombic structure. The Cr doping were influence the lattice parameters and the unit cell volume suggestively due to the different of ionic radius between Mn 3+ ions and Cr 3+ ions. DC electrical resistance measurement showed that, the x = 0 sample exhibited an insulating behaviour down to the lower temperature. Interestingly, the metal-insulator (MI) transition temperature for x = 0.02 and x = 0.04 samples were found to be around TMI~120 K and TMI~122 K respectively indicating the enhancement of double-exchange (DE) mechanism as a result of weakening the Jahn-Teller (JT) effect which caused the charge ordered (CO) state to be weakened. scanning electron microscope (SEM) images of Pr0.75Na0.25Mn1-xCrxO3 compound showed the morphology of the samples were quite uniform suggestively due to the good crystalline nature.

show abstract

Section: Introductionmentioning

confidence: 90%

Enhancement of Double-Exchange Mechanism in Charge-Ordered Pr0.75Na0.25MnO3 Ceramics by Cr Doped at Mn-Site

Zawawi¹,

Ibrahim²,

Shamsuddin³

2018

IJCRSET

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show abstract

“…The metal-insulator (MI) transition of the samples appeared at (x = 0.04) and disappeared with further Cr doping. Besides, the electrical study of La0.8Ca0.2Mn1-xCrxO3 shows the TMI shifts towards lower temperature as the Cr content increased probably due to the weakening of double exchange (DE) mechanism by reducing the ratio of Mn 3+ /Mn 4+ [10]. However, the behavior of CO affected by the elemental substitution at Mn-site of mixed valence perovskite manganites is still not clearly understood.…”

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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Magnetic properties and evolution of magnetoresistance effect in Pr0.75Na0.05K0.20Mn1–xFexO3 with $$0\le x\le$$ 0.04

Aziz

Ibrahim²,

Rajmi³

et al. 2022

Appl. Phys. A

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Electric, magnetic, and thermo-electric properties of Cr doped La0.8Ca0.2Mn1−Cr MnO3 manganites

Cited by 8 publications

References 34 publications

Enhancement of Double-Exchange Mechanism in Charge-Ordered Pr0.75Na0.25MnO3 Ceramics by Cr Doped at Mn-Site

Enhancement of Double-Exchange Mechanism in Charge-Ordered Pr0.75Na0.25MnO3 Ceramics by Cr Doped at Mn-Site

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

Magnetic properties and evolution of magnetoresistance effect in Pr0.75Na0.05K0.20Mn1–xFexO3 with $$0\le x\le$$ 0.04

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