Tuning the composition and magnetostructure of dysprosium iron garnets by Co-substitution: An XRD, FT-IR, XPS and VSM study

Ramachandran, Tholkappiyan; Vishista, K.

doi:10.1016/j.apsusc.2015.05.193

Cited by 128 publications

(53 citation statements)

References 48 publications

(49 reference statements)

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“…Therefore, studying about manufacturing methods and the properties of rare-earth iron garnets in nano size is necessary and expands the applicability of the material. Up to now there are still few reports in the literature on the structural and magnetic properties of single phase nanocrystalline RIG garnets which were prepared by chemical sol-gel methods [11e14], glycine assisted combustion [15] or by mechanical milling [6,16,17]. It was found that in general the reduction in particle size causes the decrease in saturation magnetization.…”

Section: Introductionmentioning

confidence: 99%

Crystallization and magnetic characterizations of DyIG and HoIG nanopowders fabricated using citrate sol-gel

Nguyet

Duong

Satoh

et al. 2016

Journal of Science: Advanced Materials and Devices

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a b s t r a c tDy and Ho iron garnets in form of nanoparticles were synthesized by citrate sol-gel method. Phase formation, lattice constant and average crystallite sizes of the samples were determined via XRD measurements. Morphology and particle size distribution were studied by TEM and chemical composition was checked by EDX. Magnetic measurements in temperature range 5e600 K and in the maximum applied field of 50 kOe were carried out by using SQUID and VSM. Their magnetic parameters, including Curie temperature, magnetization compensation temperature, spontaneous magnetization, high-field susceptibility, magnetic coercivity were discussed in the framework of three interacting magnetic sublattices, magnetocrystalline anisotropy, core-shell model and compared to those of the bulk materials. Based on these analyses further evaluation on the crystallinity and homogeneity of the samples has been made.

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Section: Introductionmentioning

confidence: 99%

Crystallization and magnetic characterizations of DyIG and HoIG nanopowders fabricated using citrate sol-gel

Nguyet

Duong

Satoh

et al. 2016

Journal of Science: Advanced Materials and Devices

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“…It can be seen from Figure that the magnetic hysteresis loop of the prepared magnetic goethite appears S‐like, and that the magnetic coercive force and remanence strength are almost zero. This indicates that the magnetic goethite exhibits typical super‐paramagnetic behaviour . Compared with the saturation magnetisation intensity of goethite (0.08 emu⋅g −1 ), the saturation magnetisation intensity of magnetic goethite was greatly increased to 8.2 emu⋅g −1 .…”

Section: Resultsmentioning

confidence: 89%

“…This indicates that the magnetic goethite exhibits typical superparamagnetic behaviour. [22] Compared with the saturation magnetisation intensity of goethite (0.08 emu⋅g À 1 ), the saturation magnetisation intensity of magnetic goethite was greatly increased to 8.2 emu⋅g À 1 . The results show that the magnetic goethite is super-paramagnetic, which makes it suitable for magnetic separation from solution.…”

Section: Vsm Analysismentioning

confidence: 92%

Removal of Cr(VI) from Wastewater by a Novel Adsorbent of Magnetic Goethite: Adsorption Performance and Adsorbent Characterisation

Liu

Chen

et al. 2019

ChemistrySelect

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A novel adsorbent of magnetic goethite was prepared by neutralisation hydrolysis and employed for Cr(VI) adsorption from aqueous solution. The magnetic goethite adsorbent was characterised by using scanning electron microscopy (SEM), X‐ray diffractometer (XRD), vibrating sample magnetometer (VSM), fourier transform infrared (FTIR), brunauer‐Emmett‐Teller (BET) and X‐ray photoelectron spectroscopy (XPS) method. VSM showed that the prepared adsorbents are super‐paramagnetic iron hydroxide. FTIR spectra revealed that magnetic goethite have ‐OH and other functional groups. The effects of various factors, including pH, adsorbent dosage, initial concentration, and ion concentration, were evaluated. Under the conditions of pH 3, 4 g/L magnetic goethite, 20 mg/L Cr(VI) concentration, and 0.01 mol/L NaNO3, the removal efficiency of Cr (VI) reached 88.2% and the adsorption capacity of the adsorbent reached 4.32 mg/g. The adsorption kinetic tests showed that the adsorption of Cr(VI) on the adsorbent matched well with pseudo‐second‐order kinetics, indicating the occurrence of chemisorption. The fitting of the Langmuir isotherm model showed that the adsorption of Cr(VI) on magnetic goethite was monolayer adsorption. On the other hand, thermodynamic studies conjectured that the adsorption processes of magnetic goethite for Cr(VI) was endothermic and spontaneous. These results suggest that magnetic goethite has great potential for the removal of heavy metals from wastewater.

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“…Figure shows the XPS data of the CaZr 0.9 Sm 0.025 Dy 0.075 O 3 sample and the presence of calcium, zirconium, oxygen, dysprosium, and samarium were detected in the sample. The peaks centered at 1079.0 and 1100.5 eV correspond to the 3d 5/2 and 3d 3/2 states of Sm 3+ , peak at 157 eV indicates the presence of 4d 3/2 state of Dy 4d core level corresponding to Dy 3+ ions, peaks at 345.93 and 438.73 eV corresponds to the 2p 3/2 and 2s states of calcium, peak at 182.78 eV 3d 5/2 state of Zr 4+ .…”

Section: Resultsmentioning

confidence: 99%

“…The binding energy peak at 529.58 eV corresponding to the 1s state of oxygen indicating that the cation are ionically bonded to oxygen atom . The peak at 977.45 eV corresponds to the O Auger (KLL) …”

Section: Resultsmentioning

confidence: 99%

Tailoring the photoluminescent properties of samarium and dysprosium codoped calcium zirconate perovskites for WLED applications

Venugopal¹,

Kumar²,

Satheesh³

et al. 2019

Int J Applied Ceramic Tech

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This study investigates the photoluminescent properties of Dy3+/Sm3+ single and codoped CaZrO3perovskites that were prepared through conventional solid state ceramic route method. X‐ray diffraction studies confirmed the orthorhombic (Pnma) perovskite structure of the calcined samples. Photoluminescence studies of Dy3+doped CaZrO3 systems showed emission peaks at 484 nm and 575 nm due to the transition between 4F9/2–6H15/2 and 4F9/2–6H13/2 levels respectively. Intense red emissions were observed for Sm3+ doped CaZrO3 systems at around 567 nm, 603 and 646 nm that corresponds to the 4G5/2 → 6H5/2, 4G5/2 → 6H7/2 and 4G5/2 → 6H9/2 transitions of Sm3+. Two different emissions were observed at different excitations for Dy3+/Sm3+ codoped CaZrO3systems. Pleasant white light emission was achieved for the CaZr0.9Sm0.025Dy0.075O3 system at 354 nm excitation with CIE color coordinates (0.3310, 0.3349) with a quantum yield of 16.14%, makes this system a promising candidate for WLED and display device applications. Uniform grain morphology and elemental composition of CaZr0.9Sm0.025Dy0.075O3 sample was revealed from scanning electron microscopic and electron dispersive X‐ray analysis. The presence of elements and their oxidation states in the calcined samples for doubly doped system was confirmed from X‐Ray photoelectron spectroscopicstudies.

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Tuning the composition and magnetostructure of dysprosium iron garnets by Co-substitution: An XRD, FT-IR, XPS and VSM study

Cited by 128 publications

References 48 publications

Crystallization and magnetic characterizations of DyIG and HoIG nanopowders fabricated using citrate sol-gel

Crystallization and magnetic characterizations of DyIG and HoIG nanopowders fabricated using citrate sol-gel

Removal of Cr(VI) from Wastewater by a Novel Adsorbent of Magnetic Goethite: Adsorption Performance and Adsorbent Characterisation

Tailoring the photoluminescent properties of samarium and dysprosium codoped calcium zirconate perovskites for WLED applications

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