The magnetic properties of rare earth-Pd<sub>3</sub>phases

Gardner, W. E.; Penfold, J.; Smith, Trenton G.; Harris, I.R.

doi:10.1088/0305-4608/2/1/019

Cited by 165 publications

(45 citation statements)

References 31 publications

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“…One of the such series is palladium-based RPd 3 , and related RPd 3 B (R: rare-earth elements) compounds [5][6][7][8][9][10][11][12]. Lot of work has been done on this series and in particular people have studied magnetic [13,14], transport [15] and valence fluctuating properties [16,17] of these compounds. RPd 3 (R: Sc, Y and La to Lu) compounds form in a cubic AuCu 3 structure with Pm3m space group symmetry [3,17].…”

Section: Introductionmentioning

confidence: 99%

Magnetic behavior of binary intermetallic compound YPd3

Pandey

Mazumdar

Ranganathan

2009

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Magnetic behavior of binary intermetallic compound YPd3

Pandey

Mazumdar

Ranganathan

2009

Journal of Alloys and Compounds

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“…The paramagnetic responses of Pr 3+ and Pr 4+ (isoelectronic to Ce 3+ ) depart only slightly from a standard Curie behavior, in such a way that their magnetism can be properly described by a temperature-dependent effective moment. [23][24][25] We use the values µ eff (Pr 3+ ) = 3. Pr cations at the A sites of a perovskite structure).…”

Section: Jump In Susceptibility Around T*mentioning

confidence: 99%

“…26 For Sm 3+ , the mixing effects between neighboring multiplets is more pronounced, leading to a substantial temperature-independentparamagnetic (TIP) term, which can be dominant in the temperature range of present interest. [23][24][25]27 From a coupled investigation of SmCoO 3 and GdCoO 3 , Ivanova et al showed that the paramagnetism of Sm 3+ (on the A site of a perovskite structure), in the range 20-320 K, can be described by the combination of a small effective moment, µ eff (Sm 3+ ) = 0.47 µ B, and a large TIP term,  0 (Sm 3+ ) = 1.4 10 -3 emu/mol. 28 [16][17][18][19][20] The starting point of the controversy is that the 5 T 2g multiplet of the HS state is split by the spin-orbit coupling into a triplet, a quintet and a septet, with the triplet at the bottom.…”

Section: Jump In Susceptibility Around T*mentioning

confidence: 99%

Jumps in entropy and magnetic susceptibility at the valence and spin-state transition in a cobalt oxide

Hardy¹,

Guillou²,

Bréard³

2013

J. Phys.: Condens. Matter

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A wide family of cobalt oxides of formulation (Pr 1−y Ln y ) 1−x Ca x CoO 3 (Ln being a lanthanide) exhibits a coupled valence and spin-state transition (VSST) at a temperature T*, which involves two concomitant modifications: (i) a change in the spin state of Co 3+ from low-spin (T < T*) to a higher spin-state (T > T*), and (ii) a change in the valence state of Pr, from a mixed Pr 4+ /Pr 3+ state (T < T*) to a purely trivalent state (T > T*), accompanied by an equivalent charge transfer within the Co 3+ /Co 4+ subsystem. In the present paper, the VSST taking place in (Pr 0.7 Sm 0.3 ) 0.7 Ca 0.3 CoO 3 at T*  90 K is investigated by magnetization and heat capacity measurements. First , we quantitatively characterized the jumps in magnetic susceptibility () and entropy (S) around T*. Then, these values were compared to those calculated as a function of the variations in the population of the different cationic species involved in the VSST. X-ray absorption spectroscopy experiments recently showed that the higher spin state above T* should be regarded as an inhomogeneous mixture between lowspin (LS) and high-spin (HS) states. In the frame of this description, we demonstrate that the jumps in both  and S can be associated to the same change in the Co 3+ HS content around T*. This result lends further support to the relevance of the LS/HS picture for the VSST, challenging the currently dominant interpretation based on the occurrence of an intermediatespin (IS) state of Co 3+ above T*.

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“…Flotation techniques are recommended as good separation and preconcentration [6][7][8] tools with most of the advancing factors previously mentioned. Recently, the flotation-separation step can be analytically completed spectrophotometrically 9 or by a suitable technique, such as atomic absorption spectrometry.…”

mentioning

confidence: 99%

“…Although many spectrophotometric methods have been reported for the determination of Pd(II) [6][7][8] , a simple, rapid and economical flotation-spectrophotometric method has been developed for the concentration and determination of trace Pd(II) in different matrices using HOL as a surfactant and HHB as a chelating reagent. This reagent is more sensitive and specific than many of the reagents reported for Pd(II).…”

mentioning

confidence: 99%

Selective Flotation-Spectrophotometric Procedure for the Trace Analysis of Palladium(II) in Different Matrices

1999

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The determination of palladium under microgram concentration levels is generally hampered by insufficient sensitivity of the techniques used and or by a matrix effect. With the introduction of techniques, sensitivity problems have been drastically reduced.There are chemical and physical methods to increase the sensitivity and decreasing matrix effects, such as extraction 1,2 or preconcentration by solvent evaporation; however, in the presence of complex matrices with very low concentration of the analyte, these methods are seldom effective and are considered to be unsatisfactory. However, the development of a sensitive, accurate, precise and fast procedure using less sophisticated instruments is a vital process.The formation of extractable chelates of Pd(II) with dithizone 3 and dithiocarbamate 4 has been applied to the separation of Pd(II) from other platinum metal ions. Also, the extraction of Pd(II) halide complexes affords convenient separation.5 Oxime derivatives have also been used for extraction and the spectrophotometric determination of Pd(II).Flotation techniques are recommended as good separation and preconcentration 6-8 tools with most of the advancing factors previously mentioned. Recently, the flotation-separation step can be analytically completed spectrophotometrically 9 or by a suitable technique, such as atomic absorption spectrometry. 10 Such techniques acquire analytical importance as the flotation-separation step is selectively completed.Although many spectrophotometric methods have been reported for the determination of Pd(II) 6-8 , a simple, rapid and economical flotation-spectrophotometric method has been developed for the concentration and determination of trace Pd(II) in different matrices using HOL as a surfactant and HHB as a chelating reagent. This reagent is more sensitive and specific than many of the reagents reported for Pd(II). 3,4 Moreover, this method involves the determination of trace Pd(II) after selective separation by floatation, those eliminating the effect of foreign ions and increasing the sensitivity. Also, the direct determination of Pd(II) in the surfactant phase decreases its determination time and loss during the determination. Another advantage of the present investigation is that the data obtained spectrophotometrically were attained by the simplest colorimetric analysis method.A literature survey showed that ion-flotation followed by a spectrophotometric determination of Pd(II) is rarely reported.11,12 Also, no attempt has been found for using HHB in this concern. Fortunately, in this investigation, HHB finds its role for a direct spectrophotometric determination of Pd(II), and also gives high performance in the preconcentration of Pd(II) via its flotation as HHB-Pd colligend. Experimental ReagentsPalladium stock solutions were prepared by dissolving 1 g PdCl 2 (Merck) in 3 ml HCl followed by dilution to 250 ml using doubly distilled water or ethanol. For the analysis of simulated ores, a Pd stock solution was prepared by dissolving 1 g of Pd wire in few ml of ...

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The magnetic properties of rare earth-Pd₃phases

Cited by 165 publications

References 31 publications

Magnetic behavior of binary intermetallic compound YPd3

Magnetic behavior of binary intermetallic compound YPd3

Jumps in entropy and magnetic susceptibility at the valence and spin-state transition in a cobalt oxide

Selective Flotation-Spectrophotometric Procedure for the Trace Analysis of Palladium(II) in Different Matrices

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The magnetic properties of rare earth-Pd3phases

Cited by 165 publications

References 31 publications

Magnetic behavior of binary intermetallic compound YPd3

Magnetic behavior of binary intermetallic compound YPd3

Jumps in entropy and magnetic susceptibility at the valence and spin-state transition in a cobalt oxide

Selective Flotation-Spectrophotometric Procedure for the Trace Analysis of Palladium(II) in Different Matrices

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The magnetic properties of rare earth-Pd₃phases