Structural, magnetic and electrical properties of a new double-perovskite LaNaMnMoO ₆ material

Abstract

Structural, magnetic, magnetocaloric, electrical and magnetoresistance properties of an LaNaMnMoO6 powder sample have been investigated by X-ray diffraction (XRD), magnetic and electrical measurements. Our sample has been synthesized using the ceramic method. Rietveld refinements of the XRD patterns show that our sample is single phase and it crystallizes in the orthorhombic structure with Pnma space group. Magnetization versus temperature in a magnetic applied field of 0.05 T shows that our sample exhibits a paramagnetic–ferromagnetic transition with decreasing temperature. The Curie temperature TC is found to be 320 K. Arrott plots show that all our double-perovskite oxides exhibit a second-order magnetic phase transition. From the measured magnetization data of an LaNaMnMoO6 sample as a function of the magnetic applied field, the associated magnetic entropy change |−ΔSM| and the relative cooling power (RCP) have been determined. In the vicinity of TC, |−ΔSM| reached, in a magnetic applied field of 8 T, a maximum value of ∼4 J kg−1 K−1. Our sample undergoes a large magnetocaloric effect at near-room temperature. Resistivity measurements reveal the presence of an insulating-metal transition at Tρ = 180 K. A magnetoresistance of 30% has been observed at room temperature for 6 T, significantly larger than that reported for the A2FeMoO6 (A = Sr, Ba) double-perovskite system.

Structural and Optical Properties of Sm3+ Doped B-site Ba0.5Rb0.5LaTeO6 Double Perovskites

“…These values verify that the compounds are a cubic symmetry. The Goldschmidt tolerance factor is defined as [23]: (1) Where is the average ionic radius at the A-site of the ABO 3 type compound, and are the ionic radii of the B-site.The ionic radii used for the calculating tolerence factor are Ba 2+ = 1.61 Å, La 3+ = 1.36 Å, Rb 1+ =1.72 Å, Te 6+ = 0.56 Å and O 2-= 1.35 Å [24]. The observed XRD pattern and obtained lattice parameters are very much similar and consistent with the reported ones [22].…”

“…Double perovskite compounds with the general chemical formula AA'BB'O6, where A, A' are alkali or rare-earth metals and B, B' are transition metals have been extensively studied in recent years [1], [2]. These compounds are important as they exhibit remarkable structural and physical properties which the most significant for the applications in spintronics applications, magnetoresistive and magneto-electric devices [3], [4], [5].…”

Effect of Mn Doping on the Optical and Electrical Properties of Double Perovskite Sr2TiCoO6

“…Reported research findings on doped materials have shown profound results regarding band gap energy, magnetic properties, electrical behavior, etc. [ 16 , 17 , 18 ], which may widen their applications. Thus, substitutional doping is a longstanding method that has been used to modify the characteristics of the materials without changing the crystal structure as the parent material.…”

Pectins as Emulsifying Agent on the Preparation, Characterization, and Photocatalysis of Nano-LaCrO3

“…Perovskite compounds, ABO 3 (where A = cation of alkali, alkaline earth, or lanthanide metal and B = cation of transition metal), have unique chemical and physical properties such as oxidative, magnetic, conductive, refractive, luminescent, and catalytic. With such interesting and valuable characteristics, these compounds have been utilized tremendously in electronic devices as a tuner of the dielectric/ferroelectric responses [7] and an overcomer inefficiency on photovoltaics and other optoelectronic devices [8], sensors as a hydrazine detector [9] and ozone sensing property [10], magnetisms as a huge magnetoresistance [11] and a magnetoelectric response [12], photoluminescences as a highly photoluminescent thin film [13] and a light-emitting material [14], catalysts as CO2/H2 converter into alcohol [15] and pollutant decomposer [16], solid oxide fuel cells as a self-anode in the next power generator [17] and a good performance cathode [18], and photocatalysts as a photo-oxidator of benzylic alcohol [19] and a decomposer of dyes [20].…”