Effect of Er substitution on ultrasonic anomaly in Dy0.5−xErxBa0.5CoO3 cobaltates

Shamsuddin, Sarah Addyani; Ibrahim, Abdel Baset Mohamed El Nabwi Abdel Hamid; Yahya, A. K.

doi:10.1016/j.ultras.2013.02.002

Cited by 2 publications

(2 citation statements)

References 27 publications

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“…A similar suggestion was also proposed for Nd0.5Ca0.5Mn1-xCrxO3 [15]. Apart from that, the substitution of Cr 3+ was also suggested to induce the lattice distortion and rearrangement of atom as a results of smaller cation in the B-site of the ABO3 perovskite structure is responsible for the reduction in unit cell volume [17][18][19]. Fig.…”

Section: Methodssupporting

confidence: 66%

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.

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Section: Methodssupporting

confidence: 66%

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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“…This is possibly due to the relatively larger of Mn 3+ ion with higher ionic radius (0.645 Å) partially substitute of Cr 3+ ions that has a smaller ionic radius (0.615 Å) as proposed by [22] in La0.67Ba0.33Mn1−xCrxO3 compound [22]. Apart from that, the substitution of Cr 3+ for all samples were also suggested to induce the lattice distortion and rearrangement of atom as a result of smaller cation in the B-site of the ABO3 perovskite structure is responsible for the reduction in unit cell volume [23][24][25] and it is also supported by D values when Cr doped in these manganite compound. Figure 3 shows the temperature dependence of electrical resistivity in the temperature range 50-300 K for Pr0.75Na0.25Mn1-xCrxO3 (x = 0, 0.02 and 0.04) under zero magnetic field.…”

Section: Structural Analysismentioning

confidence: 65%

Comparative Study on Structural, Electrical Transport and Magnetic Properties of Cr-Doped in Charge-Ordered Pr0.75Na0.25Mn1-Xcrxo3 and Nd0.75Na0.25Mn1-Ycryo3 Manganites

Zawawi¹,

Khairulzaman²,

Shamsuddin³

et al. 2018

IJET

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Cr doping in charge-ordered Pr0.75Na0.25Mn1-xCrxO3 and Nd0.75Na0.25Mn1-yCryO3 have been synthesized using conventional solid-state method to investigate its effect on structural, electrical transport and magnetic properties. X-ray diffraction (XRD) analysis for both compounds showed that the samples were crystallized in an orthorhombic structure with Pnma group. The unit cell volume value decrease as the Cr-doped increased indicating the possibility of Mn3+ ion was replaced by Cr3+ due to the different of ionic radius. The temperature dependence of electrical resistivity showed an insulating behavior down to the lower temperature the both parent compound (x = 0 and y = 0). Successive substitution of Cr at Mn-site in Pr0.75Na0.25Mn1-xCrxO3 manganites induced the metal-insulator (MI) transition temperature around TMI~120 K and TMI~122 K for x = 0.02 and x = 0.04 samples respectively suggestively due to the enhancement of double-exchange (DE) mechanism as a result of suppress the CO state. Analysis of resistivity data of dlnρ/dT-1 vs. T in Nd0.75Na0.25Mn1-yCryO3 manganite, showed a peak around 210 K and 160 K for y = 0 and 0.02 samples respectively while no peak was observed for y = 0.05 sample indicate the charge-ordered (CO) weakened. AC susceptibility, χ’ measurements in Pr0.75Na0.25Mn1-xCrxO3 exhibits paramagnetic to ferromagnetic-like with curie temperature, TC increases from 132 K for x = 0.02 to 141 K for x = 0.04 with Cr content indicate the suppression of CO state meanwhile in Nd0.75Na0.25Mn1-yCryO3 showed paramagnetic to anti-ferromagnetic transition as Neel temperature TN increases from 115 K for y = 0.02 to 125 K for y = 0.05.

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Effect of Er substitution on ultrasonic anomaly in Dy0.5−xErxBa0.5CoO3 cobaltates

Cited by 2 publications

References 27 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

Comparative Study on Structural, Electrical Transport and Magnetic Properties of Cr-Doped in Charge-Ordered Pr0.75Na0.25Mn1-Xcrxo3 and Nd0.75Na0.25Mn1-Ycryo3 Manganites

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