Structural, transport and magnetic properties of monovalent doped La1−xNaxMnO3 manganites

Kansara, Sanjay; Dhruv, Davit; Kataria, Bharat; Thaker, C. M.; Rayaprol, Sudhindra; Prajapat, C.L.; Singh, Meenakshi; Solanki, P.S.; Kuberkar, D. G.; Shah, N.A.

doi:10.1016/j.ceramint.2015.02.037

Cited by 67 publications

(14 citation statements)

References 32 publications

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“…The splitting of the peaks (mostly the main 110 lines) of all samples was not as pronounced like their La 1−x Na x MnO 3 analogues synthesized by solid-state route. 10,11 The XRD analysis of La 1−x Na x MnO 3 samples shows that the splitting of the main (110) lines decreases and seems to merge into one line with oxygen stoichiometry. 10 It is very likely that these La 1−x Na y MnO 3 samples are/or near oxygen stoichiometric.…”

Section: Structural and Phase Analysismentioning

confidence: 99%

“…Similar morphology was observed in the La 1−x Na x MnO 3 samples synthesized using conventional solid-state reaction route. 11 The appearance of voids in the microstructure of the samples might be due to escaping large number of gases during the combustion reaction characteristic of nanoparticles synthesized by the combustion method. The formation of multigrain agglomerates observed in all the samples consists of very fine crystallites as they show strong tendency to form agglomerates.…”

Section: Morphological and Chemical Composition Analysismentioning

confidence: 99%

“…By substitution of La 3+ with a divalent or monovalent cation, LaMnO 3 can be driven into a metallic and ferromagnetic (FM) state. 11 These unusual and interesting changes observed in the properties of mixed valent manganites have been traditionally explained by the Zener double exchange (ZDE) mechanism 12 and in recent times various other factors such as the strong electron-phonon interaction, 10,13 the charge and orbital ordering, 14 the average sizes of the R and A cations 15,16 and the oxygen stoichiometry 10,17,18 have also been implicated.…”

Section: Introductionmentioning

confidence: 99%

“…Numerous papers 1,8,10,11,23 have been devoted to the structure and properties of Na-doped lanthanum manganites which have been mainly produced by the solid-state synthetic route. It is important to note that the loss of Na can occur during the long sintering process associated with solid-state synthesis.…”

Section: Introductionmentioning

confidence: 99%

“…10,11,19,20 It is well known that the ratio of Mn 3+ /Mn 4+ is an important factor in insulator to metal (I-M) and magnetic phase transitions in manganites. Monovalent cation doping is known to have a doubling effect on Mn valence state because of the charge difference as compared to divalent cation doping and hence the cation valency distribution can be represented as La…”

Section: Introductionmentioning

confidence: 99%

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Structural, morphological and magnetic properties of La1−x Na y MnO3 (y ≤ x) nanoparticles produced by the solution combustion method

et al. 2015

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Abstract. The rapid solution combustion synthesis and characterization of sodium (Na)-substituted LaMnO 3 phases at relatively low temperature using polyvinyl alcohol (PVA) as fuel were reported. The thermal decomposition process investigated by means of differential and thermal gravimetric analysis (TG-DTA) showed that the use of PVA as a fuel was satisfactory in the synthesis of the perovskite manganite compound. Structural study using X-ray diffraction showed that all the samples were single phasic without any detectable impurities within the measurement range. Also, the Na-substituted compounds crystallize with rhombohedral symmetry (space group R-3c, no. 167) with La 0.80 Na 0.15 MnO 3 manganite sample giving the highest crystallinity. Microstructural features observed by field-emission scanning electron microscopy demonstrated that most of the grains were nearly spherical in shape with fairly uniform distribution and all the observed particles connect with each other. Energy-dispersive X-ray analyses confirm the homogeneity of the samples. Increase in magnetic moment was observed with the increase in sodium doping. Room-temperature vibrating sample magnetometer measurements showed that the samples were ferromagnetic with compositions y = 0.10, 0.15 and 0.20 showing relatively high magnetic moments of 33, 34 and 36 emu g −1 , respectively.

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Section: Structural and Phase Analysismentioning

confidence: 99%

Section: Morphological and Chemical Composition Analysismentioning

confidence: 99%