Study of structural and magnetic properties of Gd2MoO6 compound (original) (raw)
Related papers
The preferential site occupation and magnetic properties of GdxY2−xO3
Journal of Physics and Chemistry of Solids, 1993
Abstra&-The gadolinium-yttrium mixed oxides Gd,Y,_,O, were synthesized over a wide range of concentrations: x = 0.10, 0.18, 0.41, 0.74 and 1.26. The X-ray diffraction data from the polycrystalline samples were taken at room temperature and refined using the Rietveld method. Gadolinium-yttrium oxides crystallize in the space group Ia3. The cations occupy the six coordinated positions 8b and 24d. The anion occupies a general tetrahedrally coordinated position. At concentrations x Q 0.41 gadolinium ion occupies exclusively 24d, but at higher concentrations the occupation of position 86 increases continuously. The magnetic susceptibility measurements showed the presence of the antiferromagnetic interaction in all samples. The magnetic moment in the sample x = 1.26 is significantly different from the magnetic moment of the free ion Gd 3+. The Cur&Weiss temperature shows a nonlinear dependence on concentration.
Structure and magnetic properties of Gd4(Mn0.05Sb0.95)3
Physica B: Condensed Matter, 2003
This work studies the structure and magnetic properties of Gd 4 (Mn 0.05 Sb 0.95 ) 3 with the aim to clarify the role played by the magnetic Mn atom. Upon substitution of Mn for Sb in the parent Gd 4 Sb 3 compound, it is found that the inverted Th 3 P 4 -like structure has been somewhat expanded. The Curie temperature is increased while magnetic moment, measured in the field of 50 kOe at 200 K, is slightly reduced. The ferromagnetic semiconductor, Gd 4 (Mn 0.05 Sb 0.95 ) 3 , undergoes a ferromagnetic to paramagnetic transition at 270 K. Observed anomalies occur in the magnetization vs. temperature curves measured in a very low magnetic field. They are attributed to magnetic inhomogeneities resulting from a structural modification in Gd 4 (Mn 0.05 Sb 0.95 ) 3 . r 2002 Elsevier Science B.V. All rights reserved. PACS: 75.50.Pp; 75.30.Cr Keywords: Gd 4 (Mn 0.05 Sb 0.95 ) 3 ; Structure; Inhomogeneity; Magnetic phase transition 0921-4526/03/$ -see front matter r 2002 Elsevier Science B.V. All rights reserved. PII: S 0 9 2 1 -4 5 2 6 ( 0 2 ) 0 1 7 7 5 -1
Magnetic Properties and the Electronic Structure of the Gd0.4Tb0.6Co2 Compound
Materials
We report on the comprehensive experimental and theoretical studies of magnetic and electronic structural properties of the Gd0.4Tb0.6Co2 compound crystallization in the cubic Laves phase (C15). We present new results and compare them to those reported earlier. The magnetic study was completed with electronic structure investigations. Based on magnetic isotherms, magnetic entropy change (ΔSM) was determined for many values of the magnetic field change (Δμ0H), which varied from 0.1 to 7 T. In each case, the ΔSM had a maximum around room temperature. The analysis of Arrott plots supplemented by a study of temperature dependency of Landau coefficients revealed that the compound undergoes a magnetic phase transition of the second type. From the M(T) dependency, the exchange integrals between rare-earth R-R (JRR), R-Co (JRCo), and Co-Co (JCoCo) atoms were evaluated within the mean-field theory approach. The electronic structure was determined using the X-ray photoelectron spectroscopy (X...
Journal of Physics and Chemistry of Solids, 2008
The crystal and magnetic properties of the Nd 1Àx Gd x Co 4 B compounds for 0pxp1 have been studied by X-ray powder diffraction, magnetization and differential scanning calorimetry (DSC) measurements. These compounds crystallize in a hexagonal CeCo 4 B-type structure with the P6/mmm space group. The substitution of Gd for Nd leads to a decrease of the unit-cell parameter a and the unit-cell volume V, while the unit-cell parameter c remains almost constant. Magnetic measurements indicate that all samples are ordered magnetically below room temperature. The Curie temperatures determined by the DSC technique increase linearly as Nd is substituted by Gd. The saturation magnetization at 5 K decreases upon the Gd substitution up to x ¼ 0.6, and then increases again.
DSC and X-Ray Study on Gd2(MoO4)3
Zeitschrift für Naturforschung A, 1984
Lattice parameters and thermal expansion of the three crystallographic modifications (a, ß and ß') of gadolinium molybdate have been determined. The y.-ß and ß'-ß transitions have also been investigated by means of DSC and DTA measurements. For the first one a transition enthalpy of 7.5 ± 0.5 kcal/mol was evaluated, while it was observed that factors such as the thermal history, the particle size and the heating/cooling rate affect the peak areas of the second one. The results can be explained on the basis of the model proposed by Jeitschko for the ß'-ß transition provided that the necessary kinetic aspects are taken into account.
Synthesis and Magnetic Study of Nano-Crystalline Gd2CoMnO6
Materials Today: Proceedings, 2019
3d based double perovskite (DP) oxides having great research interest due to their physical properties with some great technological application. Magnetodielectric, magnetocaloric effect, ferroelectric, exotic magnetic phases etc are some properties that double perovskite materials shows, thus received attention of researchers. Magnetic refrigeration is the great cooling technology based on magnetocaloric effect due to high energy efficiency and environmental friendly. Recently, it is found that Gadolinium (Gd) have magnetic refrigerant properties because of large magnatochloric effects at room temperature. In this paper we present the double perovskite Gd 2 CoMnO 6 nano-crystalline which was prepared by sol gel method and its magnetic properties studied by vibrating sample magnetometer (VSM). There is a paramagnetic to ferromagnetic phase transition observed in the sample. We found that paramagnetic Curie-Weiss temperature of Gd 2 CoMnO 6 is around T c = 131.27 K. Further, temperature dependent inverse magnetic susceptibility (χ −1) shows deviation from curie Weiss behavior around T G ~ 213 K which is depicts that Griffiths phase singularities is present in this material.
Magnetic properties of deposited gadolinium atoms, dimers and their monoxides
The European Physical Journal D, 2007
Magnetic properties of gadolinium clusters deposited on magnetic ultrathin Fe/Cu(100) films have been measured using X-ray Magnetic Circular Dichroism spectroscopy (XMCD). 3d → 4f as well as 4d → 4f absorption spectra are presented and discussed. Changes in the relative peak intensities between the monomer, dimer and the corresponding monoxides are observed for the 4d → 4f 8 D 7/2 multiplets. The comparison with bulk measurements and calculations exhibit a transition from atomic like to bulk like properties.
Synthesis, structure and magnetic properties in the Nd2O3–Gd2O3 mixed system synthesized at 1200°C
Journal of Physics and Chemistry of Solids, 2009
Phase relation studies in the Gd 2 O 3 -Nd 2 O 3 system have been performed on (Gd 1Àx Nd x ) 2 O 3 samples (0pxp1) with the purpose of performing a systematic study of the composition effects on their structural and magnetic properties. All the samples were synthesized by calcination of the related oxalates at 1200 1C in order to ensure the complete decomposition of the oxalates. Five phase regions, namely an A-type hexagonal, a B-type monoclinic, a C-type cubic solid solution and two biphasic mixtures of the former three phase fields were detected in this system. The magnetic susceptibility measurements showed the presence of antiferromagnetic interactions in all samples. The Curie-Weiss temperature shows a nonlinear dependence on concentration. Deduced effective magnetic moments are close to the free ion values.
Ceramics
The study reports the influence of rare-earth ion doping on the structural, magnetic, and magnetocaloric properties of ferrimagnetic Gd3−xRExFe5O12 (RE = Y, Nd, Sm, and Dy, x = 0.0, 0.25, 0.50, and 0.75) garnet compound prepared via facile autocombustion method followed by annealing in air. X-Ray diffraction (XRD) data analysis confirmed the presence of a single-phase garnet. The compound’s lattice parameters and cell volume varied according to differences in ionic radii of the doped rare-earth ions. The RE3+ substitution changed the site-to-site bond lengths and bond angles, affecting the magnetic interaction between site ions. Magnetization measurements for all RE3+-doped samples demonstrated paramagnetic behavior at room temperature and soft-ferrimagnetic behavior at 5 K. The isothermal magnetic entropy changes (−ΔSM) were derived from the magnetic isotherm curves, M vs. T, in a field up to 3 T in the Gd3−xRExFe5O12 sample. The maximum magnetic entropy change (−∆SMmax) increased ...