Metamagnetic DyAlO3 nanoparticles with very low magnetic moment

Petrov, Dimitar N.; Angelov, B.; Lovchinov, V.

doi:10.1007/s10971-011-2438-3

Cited by 8 publications

(7 citation statements)

References 19 publications

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“…The plot shows a linear dependence of inverse molar susceptibility with temperature which suggests paramagnetic nature of the compound. [65][66][67] The attribution to the metamagnetic transition is valid as the data is obtained at 2K, in the range of which the compound 1 exhibits AFM interaction. In addition, the field dependent magnetic measurement was performed at 2 K and 300 K (Figure 7b).…”

Section: Magnetismmentioning

confidence: 78%

Selective colorimetric detection of Cu²⁺by lanthanide based hybrid complexes associated with a single crystal growth mediated transformation

et al. 2016

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Two rare earth (Dy 3+ and Nd 3+ ) based complexes were synthesized using the ligands bipyridine, p-amino benzoic acid and nitro benzoic acid. The complexes were characterized by single crystal and powder XRD, IR spectroscopy and thermogravimetric analysis. Both complexes showed characteristics luminescent properties of the lanthanides and weak metamagnetic transitions at low temperature. Both the Dy and Nd compounds were found to detect Cu 2+ selectively in very low concentration of the transition metal salt in the mixture of other transition metals like Cu 2+ , Co 2+ , Ni 2+ , Zn 2+ , Cd 2+ , Ag + and Au 3+ . This selective copper uptake is associated with a fast distinct colour change as a result of which the detection of copper can be realized visually. The Nd compound was more selective and detected Cu 2+ selectively till 10 -5 M concentration of the Cu salt. The Cu 2+ encapsulation in the Nd complex was characterized through a rare single crystal growth mediated transformation involving an irreversible exchange of the metal ion of the complex. This single crystal transformation facilitates the easy understanding of the copper encapsulation mechanism and also provides information on the detector complex, which is rarely studied. compounds 1 and 2 can be used to identify the presence of various transition metals like Cu, Ni, Co etc. qualitatively and also may be quantitatively if a relation between the rate of TM diffusion with the TM salt concentration can be established.The next question that naturally arises is whether there is any selectivity for this metal absorption/ metal exchange. To check this, we prepared solutions of other metal salts, NiCl 2 , CoCl 2 , ZnSO 4 , CdCl 2 , AgNO 3 and AuCl 3 of strengths same as that of the Cu 2+ solution. The selectivity studies on 1/2 were done through microscopy and ICP-OES analysis on the crystals of 1/2 and the supernatant after exchange with all the metals cations (Cu 2+ , Co 2+ , Ni 2+ , Zn 2+ , Cd 2+ , Ag + , Au 3+ ) individually.. From the metal exchange studies it was found out that 1 was selective to the coinage metals (Cu 2+ , Ag 1+ and Au 3+ ) and selectively took only these from mixture of all the salts and also when done individually, as analyzed from ICP-OES (Table S5).2, on the other hand, was very much selective to Cu 2+ and did not take any other metal cations, neither in mixture of all the salts, nor individually ( Figure 10 and Table S5). To see the sensing property of the Cu 2+ detection, Cu 2+ exchange studies were also done using other anionic salts of Cu 2+ eg. Cu(NO 3 ) 2 , CuSO 4 and it was found that both the compounds could detect Cu 2+ irrespective of the type of anion/salt used ( Figure 11, Table S5).The microscopy studies on Co, Ni, exchange interestingly showed that these metals are not getting into the system and no color change of the crystal is happening (Figure S16, S17). The color that is appearing in Figures S16b and S16c is only the solution color and after the solution is taken out, the crystals looks almost similar with absolut...

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Section: Magnetismmentioning

confidence: 78%

Selective colorimetric detection of Cu²⁺by lanthanide based hybrid complexes associated with a single crystal growth mediated transformation

et al. 2016

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“…Magnetic order generated by dysprosium resembles two antiferromagnetic networks embedded, one of them canted relative to one another. DyAlO 3 has this antiferromagnetic behavior below a T N ∼3.5 K. Moreover DyAlO 3 exhibits a metamagnetic transition that is related to an abrupt change of one or more magnetic sublattices under an applied field [5,7,8].…”

Section: Introductionmentioning

confidence: 95%

“…Magnetic effective moments, µ ef f , Curie constants, and Curie-Weiss temperatures are slightly dependent on the applied magnetic field, showing only very small changes: for low field, 0.001 T, µ ef f = 9.6 µ B , whereas for 5 T µ ef f = 10.03 µ B . [5]. Figure 4 shows the magnetization as a function of magnetic applied field M (H) at 2 K, below the Néel temperature.…”

Section: Magnetic Measurementsmentioning

confidence: 99%

“…Perovskites show many structural modifications that according to the used atoms give place to a great variety of magnetic and electronic characteristics. An example of a compound whose structure present a distortion of the ideal perovskite form, is the orthorhombic DyAlO 3 [3,4], which magnetic behavior is widely known [5][6][7][8][9][10], and interpreted from the viewpoint of the Anderson model of magnetic exchange in insulators, with a mechanism of indirect exchange between the nearest Dy ions [11].…”

Section: Introductionmentioning

confidence: 99%

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Glassy magnetic behavior in the metamagnetic DyAlO3 doped with Cr

et al. 2013

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Magnetic properties of DyAl0.926Cr0.074O3 and DyAlO3 were studied. We found that both compounds are antiferromagnetic with a low Néel transition temperature. At higher temperatures the magnetic characteristics show a Curie-Weiss dependence. The Néel temperature disappears when a field of about 2 T is applied, the system changes from an antiferromagnetic to a weak ferromagnetic behavior due to a metamagnetic transition. Furthermore, AC magnetic measurements in the Cr doped compound, at different frequencies, show a spin glass-like behavior. These transitions were studied and corroborated by specific heat measurements. We found the presence of metamagnetism and spin glass in the compound doped with chromium, determining that the small addition of chromium atoms modifies the magnetic properties of the compound DyAlO3, resulting in new features such as the spin glass-like behavior.

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“…The magnetic properties of the OLA include the following features: (i) their Néel temperatures are very low: below 4.2 K, or below 1 K, or not measured, (ii) there exists a large magnetic anisotropy, except for GdAlO 3 (iii) eld induced magnetization, (iv) metamagnetism below the magnetic ordering temperature and unusually low effective magnetic moment of Dy 3+ ions in nanocrystalline DyAlO 3 [5]. Eu 3+ ions in EuAlO 3 occupy two magnetically nonequivalent sites of monoclinic symmetry C 1h [6], whereas DyAlO 3 contains four magnetic sublattices [7].…”

Section: Introductionmentioning

confidence: 99%

Indirect Exchange Interactions in Orthorhombic Lanthanide Aluminates

Petrov

Angelov

2012

Acta Phys. Pol. A

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Magnetic exchange interactions in orthorhombic lanthanide monoaluminates LnAlO3, Ln = SmYb have been determined semiempirically within the Anderson model of exchange in insulators. The constants of magnetic exchange have been evaluated assuming indirect exchange between pairs of nearest Ln 3+ Ln 3+ ions via 4f n → 4f n−1 5d excitation and ionic polarization. The transfer integrals have been approximated by two-centre overlap integrals between four-term analytical 4f n radial wave functions of Ln 3+ ions. The results have been compared with the available experimental Néel temperatures in the same compounds. It has been found that in most cases the indirect exchange interactions present substantial contributions to the energy of the antiferromagnetically ordered state in LnAlO3.

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Metamagnetic DyAlO3 nanoparticles with very low magnetic moment

Cited by 8 publications

References 19 publications

Selective colorimetric detection of Cu²⁺by lanthanide based hybrid complexes associated with a single crystal growth mediated transformation

Selective colorimetric detection of Cu²⁺by lanthanide based hybrid complexes associated with a single crystal growth mediated transformation

Glassy magnetic behavior in the metamagnetic DyAlO3 doped with Cr

Indirect Exchange Interactions in Orthorhombic Lanthanide Aluminates

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Metamagnetic DyAlO3 nanoparticles with very low magnetic moment

Cited by 8 publications

References 19 publications

Selective colorimetric detection of Cu2+by lanthanide based hybrid complexes associated with a single crystal growth mediated transformation

Selective colorimetric detection of Cu2+by lanthanide based hybrid complexes associated with a single crystal growth mediated transformation

Glassy magnetic behavior in the metamagnetic DyAlO3 doped with Cr

Indirect Exchange Interactions in Orthorhombic Lanthanide Aluminates

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Selective colorimetric detection of Cu²⁺by lanthanide based hybrid complexes associated with a single crystal growth mediated transformation

Selective colorimetric detection of Cu²⁺by lanthanide based hybrid complexes associated with a single crystal growth mediated transformation