Magnetic ordering in relaxor ferroelectric (1 − x)Pb(Fe2/3W1/3)O3–xPbTiO3 single crystals

2007 ◽  
Vol 22 (8) ◽  
pp. 2116-2124 ◽  
Author(s):  
Li Feng ◽  
Haiyan Guo ◽  
Zuo-Guang Ye
Keyword(s):  
Single Crystals ◽  
Magnetic Measurements ◽  
Ferroelectric Properties ◽  
Magnetic Ordering ◽  
Magnetic Behavior ◽  
Relaxor Ferroelectric ◽  
X Ray Diffraction ◽  
Ferroelectric State ◽  
Temperature Changes ◽  
Temperature Solution

Single crystals of the perovskite solid solution (1 − x)Pb(Fe2/3W1/3)O3–xPbTiO3, with x = 0, 0.07, 0.27, and 0.75, have been synthesized by the high-temperature solution growth using PbO as flux and characterized by x-ray diffraction and dielectric and magnetic measurements. The crystal structure at room temperature changes from a pseudocubic to a tetragonal phase with the PbTiO3 (PT) content increasing to x ⩾ 0.27. As the amount of PT increases, the relaxor ferroelectric behavior of Pb(Fe2/3W1/3)O3 (PFW) is transformed toward a normal ferroelectric state with sharp and nondispersive peaks of dielectric permittivity at TC. Two types of magnetic orderings are observed on the temperature dependence of the magnetization in the crystals with x ⩽ 0.27. This behavior is explained based on the relationships among the magnetic ordering, perovskite structure, composition, and relaxor ferroelectric properties. Furthermore, the macroscopic magnetization of the system was measured under the application of a magnetic field, which demonstrates different magnetic behavior associated with the weakly ferromagnetic, antiferromagnetic, and paramagnetic ordering in the temperature range of 2 to 390 K. Interestingly, the low-temperature ferromagnetism is enhanced by the addition of ferroelectric PT up to x = 0.27.

Investigation of Magnetic Behaviour of Mechanical Activation Derived Multiferroic BiFeO3

2007 ◽  
Vol 997 ◽  
Author(s):  
Ashish Garg ◽  
Hari Kishan Thota ◽  
Brajesh Pandey ◽  
H C Verma
Keyword(s):  
Mechanical Activation ◽  
Magnetic Measurements ◽  
Magnetic Ordering ◽  
Magnetic Behavior ◽  
Magnetic Behaviour ◽  
X Ray Diffraction ◽  
Sample Heat ◽  
Heat Treated ◽  
Multiferroic Bifeo ◽  
Multiferroic Bifeo3

AbstractHere we report on the synthesis of multiferroic BiFeO3 ceramics by mechanical activation and detailed investigation into its magnetic behavior. The mechanically milled ceramic was calcined at temperatures up to 800°C. X-ray diffraction studies show only the pure BiFeO3 phase forms at 700°C. Vibrating sample magnetometer (VSM) measurements were carried out up to 1.5 Tesla and the results show a weak magnetic ordering in the ceramics. The magnetic measurements were also done on the samples heat treated under various cooling conditions. VSM measurements showed pronounced effect of cooling on the Magnetization vs Field curves. Mössbauer measurements show that short range Fe2O3 ordering is still present in the sample that goes undetected by XRD. This component decreases as the calcination temperature is increased. The nature of magnetic ordering improves upon heating from 600 to 700°C, also suggested by pure BiFeO3 phase formation at 700°C. Magnetization vs Temperature measurements conducted on the sample heat treated at 700°C for 1hr followed by cooling in air show an antiferromagnetic transition at ∼370°C.

Twinned olivenite from Cap Garonne, Mine du Pradet – structure and magnetic behavior

2020 ◽  
Vol 235 (1-2) ◽  
pp. 7-13
Author(s):  
Jutta Kösters ◽  
Christian Paulsen ◽  
Frank Stegemann ◽  
Birgit Heying ◽  
Valérie Galéa-Clolus ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Single Crystals ◽  
Cluster Model ◽  
Spin Exchange ◽  
Magnetic Behavior ◽  
Exchange Parameter ◽  
X Ray Diffraction ◽  
X Ray ◽  
Spin Cluster ◽  
Antiferromagnetic Spin

AbstractSystematically twinned olivenite (Cu2(AsO4)OH) single crystals from Cap Garonne, Mine du Pradet, France, were studied by X-ray diffraction: P 21/n, a = 822.69(6) pm, b = 861.88(9) pm, c = 594.06(9) pm, β = 90.000(6)°, wR = 0.0224, 1621 F2 values, 79 variables and a domain ratio of 0.501(1)/0.499(1). The temperature dependence of the magnetic susceptibility was well reproduced with a square-spin cluster model and an antiferromagnetic spin-exchange parameter of J/kB = 157(3) K.

Structural, dielectric and magnetic properties of Pr-, Tb- and Dy-doped (Bi0.95RE0.05)(Fe0.95Mn0.05)O3 ceramics synthesized by solid-state reaction method

2013 ◽  
Vol 03 (04) ◽  
pp. 1350033 ◽  
Author(s):  
Radheshyam Rai ◽  
Shweta Thakur ◽  
M. A. Valente ◽  
Andrei L. Kholkin
Keyword(s):  
Magnetic Properties ◽  
Solid State ◽  
Solid State Reaction ◽  
Magnetic Measurements ◽  
Ferroelectric Properties ◽  
Solid State Reaction Method ◽  
X Ray Diffraction ◽  
Solid State Reaction Technique ◽  
X Ray ◽  
Ceramic Samples

The multiferroic ( Bi 0.95 RE 0.05)( Fe 0.95 Mn 0.05) O 3 (where RE = Pr , Tb and Dy ) has been synthesized using solid-state reaction technique. Effects of Pr , Tb and Dy substitution on the structure, electrical and ferroelectric properties of ( Bi 0.95 RE 0.05)( Fe 0.95 Mn 0.05) O 3 samples have been studied by performing X-ray diffraction, dielectric measurements and magnetic measurements. The crystal structure of the ceramic samples have a monoclinic phase. The vibrating sample magnetometer (VSM) measurement shows a significant change in the magnetic properties of Pr -, Tb - and Dy -doped ( Bi 0.95 RE 0.05)( Fe 0.95 Mn 0.05) O 3. It is seen that coercive field (Hc) and remanent magnetization (Mr) increases for Pr but decreases for Dy and Tb .

Growth of Relaxor Ferroelectric Single Crystals PbZn1/3Nb2/3O3(PZN) by High Temperature Solution Growth

2005 ◽  
Vol 326 (1) ◽  
pp. 19-23 ◽  
Author(s):  
S. Ganesamoorthy ◽  
Gurvinderjit Singh ◽  
Indranil Bhaumik ◽  
A. K. Karnal ◽  
V. S. Tiwari ◽  
...  
Keyword(s):  
High Temperature ◽  
Single Crystals ◽  
Relaxor Ferroelectric ◽  
Solution Growth ◽  
High Temperature Solution ◽  
Temperature Solution

A Novel Porous Ferromagnetic Glass-Ceramic for Hyperthermia Application

2013 ◽  
Vol 454 ◽  
pp. 288-291 ◽  
Author(s):  
Jian An Liu ◽  
Mei Mei Zhang ◽  
Xue Na Yang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Saturation Magnetization ◽  
Glass Ceramic ◽  
Magnetic Measurements ◽  
Magnetic Behavior ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

A novel porous ferromagnetic glass-ceramic has been synthesized with glassceramic and hydroxyapatite for hyperthermia application. The glassceramic was obtained from a melt derived glass, and the hydroxyapatite was prepared via precipitation method with biological template (YEAST). Both components of such a mixture were sintered at 1000 °C for 1 hour in graphite. The sample was characterized by x-ray diffraction, scanning electron microscopy and magnetic measurements. This material exhibited magnetic behavior and porosity. The results show that porous ferromagnetic glass-ceramic, which saturation magnetization (Ms) of about 25 A·m2/kg and diameter of porous 30-50μm, was obtained.

scholarly journals Tuning Magnetic and Transport Properties in Quasi-2D (Mn1−xNix)2P2S6 Single Crystals

2021 ◽  
Vol 2 (3) ◽  
pp. 284-298
Author(s):  
Yuliia Shemerliuk ◽  
Yong Hui Zhou ◽  
Zhao Rong Yang ◽  
Gang Cao ◽  
Anja U.B. Wolter ◽  
...  
Keyword(s):  
Single Crystals ◽  
Magnetic Measurements ◽  
Parent Compound ◽  
Chemical Vapor ◽  
Chemical Vapor Transport ◽  
Antiferromagnetic Order ◽  
X Ray Diffraction ◽  
Transport Studies ◽  
Insulator Metal Transition ◽  
Out Of Plane

We report an optimized chemical vapor transport method to grow single crystals of (Mn1−xNix)2P2S6 where x = 0, 0.3, 0.5, 0.7, and 1. Single crystals up to 4 mm × 3 mm × 200 μm were obtained by this method. As-grown crystals are characterized by means of scanning electron microscopy and powder X-ray diffraction measurements. The structural characterization shows that all crystals crystallize in monoclinic symmetry with the space group C2/m (No. 12). We have further investigated the magnetic properties of this series of single crystals. The magnetic measurements of the all as-grown single crystals show long-range antiferromagnetic order along all principal crystallographic axes. Overall, the Néel temperature TN is non-monotonous; with increasing Ni2+ doping, the temperature of the antiferromagnetic phase transition first decreases from 80 K for pristine Mn2P2S6 (x = 0) up to x = 0.5 and then increases again to 155 K for pure Ni2P2S6 (x = 1). The magnetic anisotropy switches from out-of-plane to in-plane as a function of composition in (Mn1−xNix)2P2S6 series. Transport studies under hydrostatic pressure on the parent compound Mn2P2S6 evidence an insulator-metal transition at an applied critical pressure of ~22 GPa.

scholarly journals Nanostructure-Related Magnetic Properties of Various Mesoporous Cobalt Oxide and Cobalt Ferrite Spinel Phases

2019 ◽  
Author(s):  
Roberto Köferstein
Keyword(s):  
Magnetic Properties ◽  
Cobalt Oxide ◽  
Cobalt Ferrite ◽  
Magnetic Ordering ◽  
Magnetic Behavior ◽  
X Ray Diffraction ◽  
X Ray ◽  
Spinel Phases ◽  
Ferrite Spinel

Nanostructure-related magnetic properties are investigated systematically for various mesoporous cobalt oxide (Co3O4) and cobalt ferrite (CoFe2O4) spinel phases. Synthesis of thematerials by nanocasting offers the opportunity to obtain materials which are different from each other with respect to both specific surface area and crystallite size. As a result, the respective contributions of two types of interfaces, namely, “solid–gas” and “solid–solid” interfaces, to the magnetic ordering can be distinguished. Structural characterization of the porous materials by X-ray diffraction, N2 physisorption, and electron microscopy as well as investigation of the magnetic behavior (field-dependent magnetization and temperaturedependentsusceptibility) are presented.

Synthesis of New Nitrides Using Solid State Oxide Precursors

1993 ◽  
Vol 327 ◽  
Author(s):  
Joel D. Houmes ◽  
David S. Bem ◽  
Hans-Conrad Zur Loye
Keyword(s):  
Solid State ◽  
Magnetic Measurements ◽  
Reaction Times ◽  
Magnetic Ordering ◽  
Beta Phase ◽  
Alpha Phase ◽  
Transition Metal Nitrides ◽  
X Ray Diffraction ◽  
X Ray ◽  
Trigonal Prismatic Coordination

AbstractSeveral novel transition metal nitrides were synthesized via ammonolysis of solid state oxide precursors at temperatures ranging from 700°C-900°C and reaction times ranging from 12 hours to 4 days. Both intermetallic nitrides, Fe3Mo3N and Co3Mo3N, and ionic/covalent nitrides, FeWN2, MnWN2, Ta5N6 and Nb5N6, were prepared by this method. The products were characterized by powder X-ray diffraction and their structures were determined by powder X-ray Rietveld refinement. The intermetallic nitrides were found to be isostructural with the eta-carbide structure, Fe3W3C, while the ionic/covalent nitrides have layered structures, with metals in octahedral and trigonal prismatic coordination environments. Two polymorphs of the MnWN2 composition, α-MnWN2 and β-MnWN2, were isolated after ammonolysis at 700°C and 800°C, respectively. While the alpha phase can be converted into the beta phase by heating to 800°C under ammonia, annealing the beta phase at 700°C did not result in a structural transformation. Magnetic measurements show that FeWN2 orders antiferromagnetically at 45K. The magnetic ordering temperature was confirmed by M6ssbauer spectroscopy. All the other nitrides were paramagnetic down to 5K. Conductivity measurements show that FeWN2 and MnWN2 are metallic.

Magnetic Study of Nanoferritas CoFe2O4 Obtained by Reaction of Combustion

2014 ◽  
Vol 798-799 ◽  
pp. 402-406
Author(s):  
Polyana Tarciana Araújo Santos ◽  
Pascally M.A. Guerra de Araújo ◽  
Ana Cristina Figueiredo de Melo Costa ◽  
Daniel R. Cornejo
Keyword(s):  
Magnetic Properties ◽  
Infrared Spectroscopy ◽  
High Intensity ◽  
Magnetic Measurements ◽  
Spinel Ferrite ◽  
Magnetic Behavior ◽  
Ferrite Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Diffraction Peaks

The present work aims to study the magnetic properties of nanoferrita cobalt obtained by combustion reaction. The structural feature as well as the magnetic behavior when in the presence of a magnet and magnetic measurements was investigated. The resulting samples were characterized by X-ray diffraction (XRD), infrared spectroscopy (FTIR), magnetic behavior when in the presence of a magnet and magnetic measurements. The results indicated the phase single the spinel ferrite CoFe2O4, with high intensity of diffraction peaks indicating that the samples are crystalline and nanoparticle formation. The characteristic bands of spinel were observed for nanoferritas CoFe2O4. The ferrite nanoparticles were strongly attracted when in presence the magnet presenting a saturation magnetization of 58.0 emu/g, coercivity of 1.14 kOe.

scholarly journals Synthesis, Topological Analysis and Properties of a Coordination Polymer with Butane-1,2,3,4-tetracarboxylato-bridged (Phenanthroline)cobalt(II) Units

2011 ◽  
Vol 66 (2) ◽  
pp. 119-124 ◽  
Author(s):  
Hong-Lin Zhu ◽  
Yue-Qing Zheng
Keyword(s):  
Hydrothermal Reaction ◽  
Magnetic Measurements ◽  
Topological Analysis ◽  
Magnetic Behavior ◽  
Stacking Interactions ◽  
X Ray Diffraction ◽  
X Ray ◽  
Π Stacking ◽  
1D Chain ◽  
A Chain

A hydrothermal reaction of Co(Ac)2 ・ 4H2O, butane-1,2,3,4-tetracarboxylic acid (H4BTC), 1,10-phenanthroline (phen) and NaOH carried out at 160 °C yielded a new complex [Co2(H2O)2(phen)2(BTC)]. The complex has been characterized by single-crystal X-ray diffraction, IR spectroscopy, TG-DTA analyses, elemental analyses, powder X-ray diffraction, and magnetic measurements. The Co ions are linked by BTC4− anions into a chain, and hydrogen bonding and π-π stacking interactions result in the formation of a 3D (3,4,6)-connected supramolecular architecture with the Schläfli symbol (43.62.8)2(46.66.83)(63)2. The temperature dependence of the magnetic susceptibility of the compound follows a Curie-Weiss law χm = C/(T −Θ) with C = 4.18(4) cm3 mol−1 K and Θ = −1.43(5) K, and the magnetic behavior can be interpreted by means of a 1D chain Fisher model, where the magnetic superexchange is transmitted via π ···π stacking interactions between adjacent phen ligands, and the best fit results in J = −0.05 cm−1, and zJʹ = 0.21 cm−1.

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