G-type Antiferromagnetic Structure Research Articles

Single-crystal growth and physical properties of LaMn0.86Sb2

Single crystals of ${\mathrm{LaMn}}_{0.86}{\mathrm{Sb}}_{2}$ were synthesized via the flux method. Band structure calculation indicates the existence of Dirac dispersion below the Fermi level as expected for the square-net-based materials. Magnetization in combination with neutron diffraction measurements suggests that the magnetic structure below ${T}_{\mathrm{N}}=146 \mathrm{K}$ can be described by a G-type antiferromagnetic structure with a weak spin canting. A spin-flop transition was observed when external magnetic fields were applied parallel to the $c$ axis. Negative magnetoresistance is observed at low temperatures, likely originating from the spin alignment effect. Our results indicate that ${\mathrm{LaMn}}_{1\ensuremath{-}x}{\mathrm{Sb}}_{2}$ has Dirac dispersion and a vacancy tunable magnetism, which could be a potential platform for studying the interplay of magnetism, charge transport, and possible topological band.

Inducing the cocktail effect in yolk-shell high-entropy perovskite oxides using an electronic structural design for improved electrochemical applications

High-entropy perovskite oxides (HEPs) are promising for supercapacitors, fuel cells and metal-O2 batteries. However, the obscure mechanism of the cocktail effect makes it challenging to simultaneously enhance the energy storage capability and oxygen reduction reaction. Herein, the cocktail effect is induced through an electronic structural design. Firstly, five non-equimolar elements are optimized in an HEP to achieve strong electron–electron couplings using Bi2+ and Fe2+ as electronic donors and Mn3+ and Cu2+ as electronic acceptors. These couplings form numerous double-exchange interactions for ultralong electron transport chains. Meanwhile, the large bond angle, short bond length, and G-type antiferromagnetic structure achieved in a yolk-shell La0.7Bi0.3Mn0.4Fe0.3Cu0.3O3 HEP lead to optimized electronic structures, which are suitable for accelerating the electron exchange interactions and promoting conductivity. Therefore, the yolk-shell La0.7Bi0.3Mn0.4Fe0.3Cu0.3O3 HEP shows a cocktail effect with the highest catalytic activity toward the oxygen reduction reaction in a 0.1 M KOH electrolyte as well as a substantial specific capacity of 480.95 C g−1 at 0.5 A g−1 in 6 M KOH. Finally, a material design idea for HEPs regulating ions as electronic donors and acceptors is proposed according to Hund’s rules to induce a cocktail effect caused by changes in the electronic structures, which is promising for supercapacitors, aqueous fuel cells and metal-O2 batteries.

Structural and dielectric properties of ultra-fast microwave-processed La0.3Ca0.7Fe0.7Cr0.3O3−δ ceramics

Perovskite La0.3Ca0.7Fe0.7Cr0.3O3-δ (LCFCr) is a mixed ionic and electronic conductor (MIEC) that can be employed as an electrode material in reversible solid oxide fuel cells (RSOFCs). In this work, an ultra-fast (15 ​min) one-step microwave (MW)-assisted combustion synthesis route has been developed to obtain phase pure and highly crystalline LCFCr powder. The synthesized powders exhibited a sponge-like microstructure with increased electrochemical reaction sites. Neutron thermodiffraction analysis revealed a structural transition above 500 ​°C from the room temperature (RT) orthorhombic Pnma to a rhombohedral R3c perovskite phase. The oxygen vacancy concentration was found to increase from δ ​= ​0.272(7) at RT to δ ​= ​0.333(5) at 900 ​°C. Furthermore, a 3-dimensional G-type antiferromagnetic structure was detected at RT. MW-sintering of pressed green ceramic pellets was carried out at 950 ​°C for 1 ​h, using a MW-transparent quartz fiber crucible or alternatively a SiC crucible acting as a MW-absorber. Impedance spectroscopy data on sintered ceramic pellets revealed electronic inhomogeneity as demonstrated by the occurrence of three dielectric relaxation processes associated with two grain boundary (GB)-like contributions and one bulk. The dielectric inhomogeneity encountered may be restricted to the extrinsic GB areas, which may be rather thin. More homogeneous dielectric properties of the GBs were found in the pellet that was sintered in the SiC crucible.

Out-of-plane magnetic anisotropy in bulk ilmeniteCoTiO3

Structural, electronic, and magnetic properties of bulk ilmenite ${\mathrm{CoTiO}}_{3}$ are analyzed in the framework of density functional theory, using the generalized gradient approximation and Hubbard-corrected approaches. We find that the G-type antiferromagnetic structure, which consists of antiferromagnetically coupled ferromagnetic $ab$ planes, is the ground state of the system, in agreement with experiments. Furthermore, cobalt titanates present two critical temperatures related to the breaking of the inter- and intralayer magnetic ordering. This would result in the individual planes remaining ferromagnetic even at temperatures above the N\'eel temperature. When spin-orbit coupling is included in our calculations, we find an out-of-plane magnetic anisotropy, which can be converted to an in-plane anisotropy with a small doping of electrons corresponding to about 2.5% Ti substitution for Co, consistent with experimental expectations. We thus present a disorder-dependent study of the magnetic anisotropy in bulk ${\text{CoTiO}}_{3}$, which will determine its magnon properties, including topological aspects.

Crystalline and magnetic structures, magnetization, heat capacity, and anisotropic magnetostriction effect in a yttrium-chromium oxide

We have studied a nearly stoichiometric insulating Y$_{0.97(2)}$Cr$_{0.98(2)}$O$_{3.00(2)}$ single crystal by performing measurements of magnetization, heat capacity, and neutron diffraction. Albeit that the YCrO$_3$ compound behaviors like a soft ferromagnet with a coersive force of $\sim$ 0.05 T, there exist strong antiferromagnetic (AFM) interactions between Cr$^{3+}$ spins due to a strongly negative paramagnetic Curie-Weiss temperature, i.e., -433.2(6) K. The coexistence of ferromagnetism and antiferromagnetism may indicate a canted AFM structure. The AFM phase transition occurs at $T_\textrm{N} =$ 141.5(1) K, which increases to $T_\textrm{N}$(5T) = 144.5(1) K at 5 T. Within the accuracy of the present neuron-diffraction studies, we determine a G-type AFM structure with a propagation vector \textbf{k} = (1 1 0) and Cr$^{3+}$ spin directions along the crystallographic \emph{c} axis of the orthorhombic structure with space group \emph{Pnma} below $T_\textrm{N}$. At 12 K, the refined moment size is 2.45(6) $\mu_\textrm{B}$, $\sim$ 82\% of the theoretical saturation value 3 $\mu_\textrm{B}$. The Cr$^{3+}$ spin interactions are probably two-dimensional Ising like within the reciprocal (1 1 0) scattering plane. Below $T_\textrm{N}$, the lattice configuration (\emph{a}, \emph{b}, \emph{c}, and \emph{V}) deviates largely downward from the Gr$\ddot{\textrm{u}}$neisen law, displaying an anisotropic magnetostriction effect and a magnetoelastic effect. Especially, the sample contraction upon cooling is enhanced below the AFM transition temperature. There is evidence to suggest that the actual crystalline symmetry of YCrO$_3$ compound is probably lower than the currently assumed one. Additionally, we compared the $t_{2\textrm{g}}$ YCrO$_3$ and the $e_\textrm{g}$ La$_{7/8}$Sr$_{1/8}$MnO$_3$ single crystals for a further understanding of the reason for the possible symmetry lowering.

Strain-induced magnetic transition in CaMnO3 ultrathin films

The effect of high tensile strain and low dimensionality on the magnetic and electronic properties of CaMnO$_3$ ultrathin films, epitaxially grown on SrTiO$_3$ substrates, are experimentally studied and theoretically analyzed. By means of ab initio calculations, we find that, both, the high strain produced by the substrate and the presence of the free surface contribute to the stabilization of an in-plane ferromagnetic coupling, giving rise to a non-zero net magnetic moment in the ultrathin films. Coupled with this change in the magnetic order we find an insulator-metal transition triggered by the quantum confinement and the tensile epitaxial strain. Accordingly, our magnetic measurements in 3nm ultrathin films show a ferromagnetic hysteresis loop, absent in the bulk compound due to its G-type antiferromagnetic structure.

Weak ferromagnetism and magnetoelectric coupling through the spin–lattice coupling in (1−x)Pb(Fe2/3W1/3)O3–(x)BiFeO3 (x = 0.1 and 0.4) solid solution

We report on the structure, spin–lattice and magneto-electric coupling in (1−x)Pb(Fe2/3W1/3)O3–(x)BiFeO3(where x = 0.1 and 0.4) (PBFW) solid solution synthesized through two-step solid-state reaction method. The room temperature (RT) crystallographic studies were carried out using x-ray diffraction and neutron diffraction measurements which show a single-phase Pseudocubic crystal system with Pm-3m space group. Rietveld refinement was carried out to obtain the structural parameters using Fullprof software and the observed structural parameters are in good agreement with the previous reports. Temperature-dependent neutron diffraction measurements reveal the presence of commensurate G-type antiferromagnetic structure. The magnetic structure was analyzed using the propagation wave vector k ∼ (½ ½ ½) for both the solid solutions. The obtained lattice constants increase linearly and the magnetic moment decrease with temperature, which shows a remarkable anomaly around the magnetic (TN ∼ 405 K for x = 0.1 and 531 K for x = 0.4) transition temperatures. This anomaly clearly indicates the existence of spin–lattice and magnetoelectric coupling. The magnetic susceptibility (ZFC and FC at 500 Oe) and M–H hysteresis loop measurements show spontaneous magnetic moment due to the Fe3+–O2−–Fe3+ superexchange interaction coexisting with the weak ferromagnetism. Bifurcation of ZFC and FC curve reveals the strong anisotropic nature. Astonishingly, magnetic measurements show the non-zero magnetic moment above TN and broadening of the magnetic transition indicates the presence of short-range uncompensated sublattice weak ferromagnetic clusters in the paramagnetic region. The Mossbauer spectroscopy and electron paramagnetic resonance studies exhibit the RT magnetically ordered system and confirm the +3 state of Fe along with the fraction of Fe2+ ions.

Structural, strong magnetic exchange, and room temperature multiferroic properties of single-phase 0.75BiFeO3–BaFe1/2Nb1/2O3 bulk ceramics

The ceramic 0.75BiFeO3–BaFe1/2Nb1/2O3 (0.75BF–BaFN) exhibits enhanced magnetisation and polar order regions at room temperature. This study investigated the microscopic structure and the magnetic, ferroelectric, magneto-ferroelectric, and optical properties of 0.75BF–BaFN by conducting experiments and performing density functional theory (DFT) calculations. Evidence of weak amplitude R-type octahedral rotations was observed using transmission electron microscopy (TEM). X-ray diffraction (XRD) refinement revealed that the P1 space group more appropriately described the structure of 0.75BF–BaFN. The weak influence of the magnetic field H on the polarisation of 0.7BF–BaFN and 0.75BF–BaFN ceramics was investigated. A notable magnetic enhancement was observed in 0.75BF–BaFN ceramics with a saturation magnetisation of 0.19 μB per Fe. DFT calculations predicted that the stable magnetic configuration of 0.75BF–BaFN is a G-type antiferromagnetic (AFM) structure. This study found stronger magnetic interactions between first-neighbour Fe ions (Ja = 12 meV) compared to pure BiFeO3. With a significant remanent moment, strong exchange coupling, and magnetic field control of polarisation, 0.75BF–BaFN may facilitate the development of room temperature single-phase magnetoelectric components.

Modified crystal structure, dielectric and magnetic properties of Cr doped SmFeO3 ceramic

The effects of Cr3+ doping on the crystal structure, dielectric and magnetic phase transition of SmFeO3 have been investigated. The XRD pattern analysis shows that all the peaks for SmFe1-xCrxO3 samples can be indexed according to the crystal structure of pure SmFeO3 and has a fine crystal structure. The dielectric constants of SmFe1-xCrxO3 (x = 0.1–0.3) ceramics (εr = 2532, 1959, 1172) are only 0.86, 0.67 and 0.41 times that of SmFeO3 (εr = 2914) at 1 kHz, respectively. The change of dielectric constant (εr) with x is mainly the result of the internal barrier layer capacitor (IBLC) mechanism and the dipole oriented polarization mechanism. It shows that the M-H of SmFeO3 at room temperature exhibits a butterfly shape disappears with the increase of Cr3+ and the magnetic properties is also gradually weakened, indicating that Cr3+ doping can effectively regulate the M-H of SmFeO3. On the M-T curve, it is found that the TSR and TN of SFO decrease from 462 K to 687 K–428 K and 536 K with increasing Cr3+, respectively. It is mainly because Cr3+ doping deforms the lattice structure of SmFeO3, destroys the antiferromagnetic order of Fe3+-O2--Fe3+ and forms the exchange interaction of Fe3+-O2--Cr3+. As a result of the three actions, the stability of the G-type antiferromagnetic structure of SmFeO3 is weakened, and the magnetic transition temperatures TSR and TN are decreased.

Spin–phonon coupling in monoclinic BiCrO3

Monoclinic BiCrO3, synthesized at high pressure and high temperature, presents interesting properties with anomalies of magnetic origin observed around 110 and 80 K, which are associated, respectively, with the rise of a G-type antiferromagnetic structure and the spin reorientation along one of the monoclinic axes. In this study, we report a strong spin–phonon coupling in monoclinic BiCrO3 observed by Raman spectroscopy. The renormalization of the phonon energy confirms the coupling with the magnetic orderings. Interestingly, some phonons exhibit this effect at the rising temperature of the G-type antiferromagnetic ordering, whereas others are sensitive to the second magnetic event. A renormalization model based on the mean-field theory, previously applied to other perovskite compounds, was used to analyze the spin–phonon coupling showing different behaviors associated with each magnetic phase.

Epitaxial growth and antiferromagnetism of Sn-substituted perovskite iridate SrIr0.8Sn0.2O3

5d iridates have shown vast emergent phenomena due to a strong interplay among its lattice, charge and spin degrees of freedom, because of which the potential in spintronic application of the thin-film form is highly leveraged. Here we have epitaxially stabilized perovskite SrIr$_{0.8}$Sn$_{0.2}$O$_3$ on [001] SrTiO$_3$ substrates through pulsed laser deposition and systematically characterized the structural, electronic and magnetic properties. Physical properties measurements unravel an insulating ground state with a weak ferromagnetism in the compressively strained epitaxial film. The octahedral rotation pattern is identified by synchrotron x-ray diffraction, resolving a mix of $a^+b^-c^-$ and $a^-b^+c^-$ domains. X-ray magnetic resonant scattering directly demonstrates a G-type antiferromagnetic structure of the magnetic order and the spin canting nature of the weak ferromagnetism.

Magnetic interactions in BiFeO3 : A first-principles study

First-principles calculations, in combination with the four-state energy mapping method, are performed to extract the magnetic interaction parameters of multiferroic BiFeO$_3$. Such parameters include the symmetric exchange (SE) couplings and the Dzyaloshinskii-Moriya (DM) interactions up to second nearest neighbors, as well as the single ion anisotropy (SIA). All magnetic parameters are obtained not only for the $R3c$ structural ground state, but also for the $R3m$ and $R\bar{3}c$ phases in order to determine the effects of ferroelectricity and antiferrodistortion distortions, respectively, on these magnetic parameters. In particular, two different second-nearest neighbor couplings are identified and their origins are discussed in details. Moreover, Monte-Carlo (MC) simulations using a magnetic Hamiltonian incorporating these first-principles-derived interaction parameters are further performed. They result (i) not only in the accurate prediction of the spin-canted G-type antiferromagnetic structure and of the known magnetic cycloid propagating along a $<$1$\bar{1}$0$>$ direction, as well as their unusual characteristics (such as a weak magnetization and spin-density-waves, respectively); (ii) but also in the finding of another cycloidal state of low-energy and that awaits to be experimentally confirmed. Turning on and off the different magnetic interaction parameters in the MC simulations also reveal the precise role of each of them on magnetism.

Phase transformation in crystal and magnetic structure and improved dielectric and magnetic properties of Ho substituted BiFeO3multiferroics

The changes in crystal and magnetic structure of BiFeO3 produced by partial substitution of Bi ions by Ho ions has been studied with powder X-ray diffraction, neutron powder diffraction, dielectric and magnetization techniques. The present study demonstrates that Bi1-xHoxFeO3(x = 0.05, 0.10, 0.15, &amp; 0.2) multiferroics shows change in crystal structure at x &amp;gt; 0.05. The sample with x = 0.05 exhibits rhombohedral structure (space group R3c), while the other three samples (x &amp;gt; 0.05) exhibit mixed phase with coexisting rhombohedral (R3c) and Orthorhombic (Pnma) structure. This change in the crystal structure is attributed to the distortion of FeO6 octahedra via substitution of Ho at phase boundaries. The magnetization studies indicate that doping of Ho in pristine BiFeO3 leads to enhancement in the ferromagnetic moment. We find that doping of Ho breaks the spin cycloid phase of BiFeO3 and creates a canted G-type antiferromagnetic structure in the hexagonal phase whereas the orthorhombic phase exhibits a collinear G-type AFM structure. The canting angle increases with increase in doping with Ho, leading to an enhancement in the ferromagnetic component in magnetization. Dielectric constant (ε′) and loss factor (tanδ) are measured in frequency range 1 kHz to 7 MHz and ε′ and tanδ show dispersion behaviour at low frequencies. The significant improvement in magnetization and dielectric properties is achieved by Ho substitution which in turn enhances the potential of BiFeO3 for multiferroics applications.

Rare earth chromium oxides revisited, special case: Structural, magnetic and thermal studies of [formula omitted] nano-powders

Due to their high chemical stability at elevated temperatures combined with interesting electric and magnetic properties, perovskite-type rare earth orthochromites of composition RCrO3 (R = rare earth element) have potential applications as catalysts, electrolytes, fuel cells, spin valve materials, multiferroics, refractory ceramics, thermoelectric materials as well as gas-sensor devices. In this work, we present a short review of the electric and magnetic properties of rare earth orthochromites with light rare earths. Especially, we focus on recent results we obtained by investigating mixed phases Ce1−xEuxCrO3 (0 ≤ x ≤ 1) which were prepared as phase pure nano-powders (particle size 50–100 nm) employing the solution combustion method. Substitution with europium as an ion with the smaller radius size and a magnetic configuration different from that of Ce3+ has essential consequences for the structural and magnetic properties. CeCrO3 exhibits one of the highest antiferromagnetic ordering temperatures ( ∼ 257 K) among the rare earth orthochromite series. By substituting Ce with Eu the Néel temperature is continuously lowered, reaching ∼ 182 K for EuCrO3. EuCrO3 orders itself with a G-type antiferromagnetic structure which we determined for the first time by elastic neutron scattering. The mixed phases Ce1−xEuxCrO3 exhibit puzzling electric and magnetic properties including magnetization reversal, exchange bias effect, and relaxor-type dielectric properties.

Weak-ferromagnetism of CoF3 and FeF3

Cobalt trifluoride CoF3 and Iron trifluoride FeF3 are known as a G-type antiferromagnetic structure in the R-3c rhombohedral crystal structure. The neutron powder diffraction study had been reported that Co antiferromagnetic spin direction is parallel to 3-fold crystal axis in CoF3 whereas Fe antiferromagnetic spin direction is perpendicular to 3-fold crystal axis in FeF3. However, the resolution of early neutron powder diffractometer is not enough to distinguish between (003)h and (101)h rhombohedral magnetic peaks definitely.We employed high-resolution powder neutron diffractometer(SuperHRPD) at room temperature in MLF, J-PARC. The time-of-flight neutron powder diffractometer distinguishes clearly between (003)h and (101)h magnetic peaks. Then, we confirmed the proposed magnetic structural models of CoF3 and FeF3 at room temperature. In a magnetic susceptibility, CoF3 displays the additional magnetic anomaly at T* = 40 K. We discussed possible weak-ferromagnetism by the interplay of spin tilting and Dzyaloshinski-Moriya interactions.

A comprehensive study of magnetic exchanges in the layered oxychalcogenides Sr3Fe2O5Cu2Q2 (Q = S, Se)

The layered oxysulfide Sr3Fe2O5Cu2S2 was prepared, and its crystal structure and magnetic properties were characterized by synchrotron X-ray diffraction (XRD), powder neutron diffraction (PND), Mössbauer spectroscopy measurements and by density functional theory (DFT) calculations. In addition, the spin exchange interactions leading to the ordered magnetic structure of Sr3Fe2O5Cu2S2 were compared with those of its selenium analogue Sr3Fe2O5Cu2Se2. The oxysulfide Sr3Fe2O5Cu2S2 adopts a G-type antiferromagnetic (AFM) structure at a temperature in the range 485–512K, which is comparable with the three-dimensional (3D) AFM ordering temperature, TN≈490K, found for Sr3Fe2O5Cu2Se2. Consistent with this observation, the spin exchange interactions of the magnetic (Sr3Fe2O5)2+ layers are slightly greater (but comparable) for oxysulfide than for the oxyselenide. Attempts to reduce or oxidize Sr3Fe2O5Cu2S2 using topochemical routes yield metallic Fe.

Crystal structure transformation and improved dielectric and magnetic properties of La-substituted BiFeO3 multiferroics

Abstract Samples of Bi 1−x La x FeO 3 with x = 0.1, 0.3, 0.5, and 0.7 have been synthesized by two stage solid state reaction method. Structural characterization was performed using powder x-ray diffraction at room temperature. The crystal structure of perovskite phases are further characterized via Rietveld analysis which revealed a structural transition from R 3 c symmetry of the parent phase of BiFeO 3 to orthorhombic Pnma symmetry of LaFeO 3 . However the intermediate samples with x = 0.3 and 0.5 are bi – phasic (i.e. a combination of rhombohedral R 3 c and orthorhombic Pbam phases co-exist). Rietveld Refinement presents a good agreement between measured and simulated patterns. The transition from a rhombohedral to orthorhombic unit cell is suggested to be driven by the dilution of the stereochemistry of the lone pair of Bi 3+ at A- site. M-H hysteresis loops are recorded at room temperature up to a field of 15 kOe. The G-type antiferromagnetic spin structure and the magnetic moment are very sensitive to increasing La concentration at A-site. La substitution transformed antiferromagnetic BiFeO 3 into ferromagnetic which is closely related to the structural phase transition and modification of antiparallel spin structure. Dielectric constant (e′) and dissipation factor (tan δ) measured in frequency range 1 kHz to 5 MHz showed dispersion behaviour at low frequencies.

Comparative study of magnetic and optical properties of Bi0.95La0.05Fe0.8M0.2O3 (M = Cr, Co, Al) ceramics

Bi0.95La0.05Fe0.8M0.2O3 (M = Cr, Co, Al) ceramics have been prepared by high pressure synthesis and their structure, magnetic, thermal, and optical properties have been investigated. X-ray diffraction suggests the pure phase formation with rhombohedral structure in all samples. The structural distortion induced by dopants is further analyzed by Raman spectra. The SEM investigation reveals that Cr and Al substitution does not affect the morphologies of Bi0.95La0.05FeO3 ceramics, while Co substitution significantly reduces the grain sizes and uniforms the morphology. The effect of substitution on the magnetic properties of Bi0.95La0.05FeO3 is different depending on M due to different mechanisms. More interestingly, Co substitution induces a change in the spin structure from a cycloidal space modulated spin structure to a collinear G-type antiferromagnetic structure, which results in obviously enhanced magnetization at room temperature. Optical studies show a sharp absorption in the visible region for all samples. The band gap values of Bi0.95La0.05FeO3 and Bi0.95La0.05Fe0.8M0.2O3 ceramics with M = Cr, Co, and Al are estimated to be 2.30, 2.06, 2.12 and 2.27 eV, respectively.

Magnetic structure and properties of centrosymmetric twisted-melilite K2CoP2O7.

Twisted-melilite dipotassium cobalt pyrophosphate (K2CoP2O7, P42/mnm, #136), originally reported by Gabelica-Robert (1981), was synthesized in powder form by a standard solid-state reaction route. The magnetic properties of the material were studied by magnetometry and its magnetic structure determined using neutron powder diffraction for the first time. Below TN = 11 K, the material adopts a G-type antiferromagnetic structure with moments aligned in the ab-plane (magnetic space group Pn'nm, #58.3.473). Ab initio calculations were performed to examine the isotropic magnetic spin exchange parameters as well as the preferred direction of magnetic moments due to spin-orbit coupling. The relationship between crystal structure geometry and the strength of the magnetic interactions was examined and compared to those of melilite-type Sr2CoGe2O7.

Evidence for Room-Temperature Weak Ferromagnetic and Ferroelectric Ordering in Magnetoelectric Pb(Fe0.634W0.266Nb0.1)O3 Ceramic

We report the evidence of weak ferromagnetic and ferroelectric ordering in polycrystalline Pb(Fe-0.634 W0.266Nb0.1)O-3 (0.8(PbFe2/3W1/3)O-3-0.2Pb(Fe1/2Nb1/2) O-3) (PFWN) ceramic at room temperature. The Pb(Fe-0.634 W0.266Nb0.1)O(3)solid solution synthesized through the columbite method. The obtained single-phase Pb(Fe-0.634 W0.266Nb0.1)O(3)ceramic was subjected to X-ray diffraction, neutron diffraction, magnetization, Mossbauer spectroscopy, and ferroelectric measurements. The X-ray diffraction and neutron diffraction pattern confirms the formation of single phase without any traces of pyrochlore phases, having cubic structure with Pm-3m space group. The Rietveld refinements were carried out on both patterns, and ND data confirms the G-type antiferromagnetic structure with propagation vector (k = 1/2, 1/2, and 1/2). However, along with the antiferromagnetic ordering of the Fe spins, we also observed the existence of weak ferromagnetism. This result was confirmed through (i) a clear opening of hysteresis (M - H) loop, (ii) bifurcation of the field-cooled (FC) and zero-field-cooled (ZFC) susceptibilities, (iii) spin-glass behavior, and (iv) Mossbauer spectroscopy.