Nonlinear magnetic susceptibility and the spin glass state in the new nonstoichiometric spinel compounds Cu1+xCr1.5+ySb0.5+zSe4+t (where −0.02≤x≤0.01, 0.03≤y≤0.35, −0.2≤z≤−0.02, 0.01≤t≤0.08)

Krok‐Kowalski, J.; Warczewski, J.; Duda, H.; Gusin, P.; Krajewski, K.; Śliwińska, T.; Pacyna, A.W.; Mydlarz, T.; Malicka, E.; Kita, Andrzej

doi:10.1016/j.jallcom.2006.05.135

Cited by 12 publications

(11 citation statements)

References 6 publications

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“…The above mentioned measurements revealed the appearance of the spin-glass states in all the compounds under study for which magnetic chromium subarray is diluted by nonmagnetic antimony ions [1][2][3]. Moreover, both the stoichiometric compounds with sulfur anion and the nonstoichiometric ones with the selenium anion magnetize very hard.…”

Section: Resultsmentioning

confidence: 84%

“…For both these compounds the Curie temperatures T C as well as the CurieWeiss temperatures θ CW are of the order of 500 K. On the base of these matrices four spinel families were obtained via substitution in the B-sites of the magnetic chromium ions by the nonmagnetic Sb or Al ions. Three of these families turned out to be stoichiometric: CuCr 2−x Sb x S 4 (x = 0.3, 0.4, 0.5) [1], CuCr 2−x Sb x Se 4 (x = 0.1, 0.2, 0.5, 0.8, 1.0) [2], CuCr 2−x Al x Se 4 (x = 0.1, 0.2, 0.3, 0.4, 0.5) whereas the fourth one, namely: Cu 1+x Cr 1.5+y Sb 0.5+z Se 4+t (where −0.02 ≤ x ≤ 0.01, 0.03 ≤ y ≤ 0.35, −0.2 ≤ z ≤ −0.02, 0.01 ≤ t ≤ 0.08) [3] occurred to be nonstoichiometric. All powder samples mentioned above were obtained by ceramic method.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Substitution of the Chromium Ions by the Nonmagnetic Sb and Al Ions on the Magnetization Processes in CuCr₂X₄(X = S, Se) Spinels

et al. 2009

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Both the dc and ac magnetic susceptibilities as well as magnetization measurements were used to study the influence of the dilution of the magnetic chromium subarray by nonmagnetic antimony and aluminium ions on the magnetization processes for four spinel families under investigation. Substitution of the chromium ions by the nonmagnetic Sb and Al ions in the compounds under study leads to the very hard magnetization in the case of the compounds with Sb and very easy magnetization in the compounds with Al. This effect is connected with the electronic configurations of the Sb and Al ions as well as with ionic radii of these cations.

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Section: Resultsmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Influence of Substitution of the Chromium Ions by the Nonmagnetic Sb and Al Ions on the Magnetization Processes in CuCr₂X₄(X = S, Se) Spinels

et al. 2009

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“…The chromium selenospinels are well-known ferromagnetic and antiferromagnetic semiconductors with unique electrical properties [ 1 – 4 ]. The general chemical formula of the compounds can be written as (A)[Cr 2 ]Se 4 , where A 2+ represents Cd 2+ , Zn 2+ , Cu 2+ , and Co 2+ cations.…”

Section: Introductionmentioning

confidence: 99%

“…Since chemical composition strongly influences electric and magnetic properties of these materials [ 1 – 3 ], detailed information on their stoichiometry is required. The chemical composition can be determined after sample digestion using, for example, inductively coupled plasma optical emission spectrometry (ICP-OES) [ 4 ] or wavelength-dispersive X-ray fluorescence spectrometry (WDXRF) [ 5 , 6 ]. However, the nondestructive methods are much more desirable because investigation of the physical properties is usually carried out for the materials in crystalline state.…”

Section: Introductionmentioning

confidence: 99%

Nondestructive analysis of single crystals of selenide spinels by X-ray spectrometry techniques

et al. 2010

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The paper presents possibilities and difficulties in nondestructive analysis of small multielement single crystals performed by means of X-ray spectrometry techniques: micro-X-ray fluorescence spectrometry (μ-XRF), energy-dispersive electron probe microanalysis (ED-EPMA), and X-ray photoelectron spectroscopy (XPS). The capability of the X-ray spectroscopy techniques in elemental analysis is demonstrated with the single crystals of selenide spinels of the general formula MxNyCrzSe4 (M+2 and N+3 are, for example, Zn+2, V+3, Ga+3, Cd+2, In+3, and Sb+3). The results of the nondestructive analyses (μ-XRF, ED-EPMA, and XPS) are compared with those obtained by inductively coupled plasma optical emission spectrometry (ICP-OES) and wavelength-dispersive X-ray spectrometry (WDXRF) following sample digestion. The present study shows satisfactory agreement between the results of μ-XRF analysis performed using the standardless fundamental parameter method and the results obtained with the WDXRF and ICP-OES analyses. If the measured single crystal is precisely positioned, the difference between μ-XRF and wet analysis (WDXRF and ICP-OES) does not exceed 5% rel. The reliable results of ED-EPMA can be obtained only if the measured area is sufficiently large, i.e., of 200 × 300 μm. Even if this condition is fulfilled, the relative difference between the ED-EPMA and the wet analysis may reach 10% rel. In case of the XPS analysis, the accuracy of results depends on the proper preparation of the sample surface. It should be free of contamination that can be obtained by scraping in situ in ultrahigh vacuum. The ion etching, commonly used for cleaning the surface, leads to preferential sputtering; therefore, the reliable results cannot be obtained.FigureThe paper presents possibilities and difficulties in nondestructive analysis of small multielement single crystals performed by means of X-ray spectrometry techniques: micro-XRF, ED-EPMA and XPS.

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“…[1][2][3][4][5][6]), spin glass state (e.g. [7][8][9][10][11][12][13][14][15][16][17]) and thermoelectric effect (e.g. [18]).…”

Section: Introductionmentioning

confidence: 99%

Percolation limit and stability conditions for the spin glass state in the spinel families based on the two matrices CuCr₂S₄and CuCr₂Se₄doped by Sb ions

Krok‐Kowalski

Warczewski

Gusin

et al. 2008

J. Phys.: Condens. Matter

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The percolation limit of the appearance of the spin glass state in the compounds under study has been obtained experimentally. The conditions of stability of the spin glass state have been analyzed here on the basis of the de Almeida-Thouless theory for two spinels differing in the magnetic coupling constants. It turned out that for the higher value of the coupling constant the magnetic field influences the freezing temperature more strongly. Moreover, the greater the coupling constant the broader the range of the possible values of freezing temperatures, in other words the greater the temperature range of the appearance of the spin glass states. It was proved that for the stability of the spin glass state the existence of a small magnetic field is necessary. In our case the value of this field is equal to 3.46 × 10(-23)T(G). For the compounds under study the value of the magnetic coupling constant J cannot exceed 130 K for the spin glass state to appear.

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Nonlinear magnetic susceptibility and the spin glass state in the new nonstoichiometric spinel compounds Cu1+xCr1.5+ySb0.5+zSe4+t (where −0.02≤x≤0.01, 0.03≤y≤0.35, −0.2≤z≤−0.02, 0.01≤t≤0.08)

Cited by 12 publications

References 6 publications

Influence of Substitution of the Chromium Ions by the Nonmagnetic Sb and Al Ions on the Magnetization Processes in CuCr₂X₄(X = S, Se) Spinels

Influence of Substitution of the Chromium Ions by the Nonmagnetic Sb and Al Ions on the Magnetization Processes in CuCr₂X₄(X = S, Se) Spinels

Nondestructive analysis of single crystals of selenide spinels by X-ray spectrometry techniques

Percolation limit and stability conditions for the spin glass state in the spinel families based on the two matrices CuCr₂S₄and CuCr₂Se₄doped by Sb ions

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Nonlinear magnetic susceptibility and the spin glass state in the new nonstoichiometric spinel compounds Cu1+xCr1.5+ySb0.5+zSe4+t (where −0.02≤x≤0.01, 0.03≤y≤0.35, −0.2≤z≤−0.02, 0.01≤t≤0.08)

Cited by 12 publications

References 6 publications

Influence of Substitution of the Chromium Ions by the Nonmagnetic Sb and Al Ions on the Magnetization Processes in CuCr2X4(X = S, Se) Spinels

Influence of Substitution of the Chromium Ions by the Nonmagnetic Sb and Al Ions on the Magnetization Processes in CuCr2X4(X = S, Se) Spinels

Nondestructive analysis of single crystals of selenide spinels by X-ray spectrometry techniques

Percolation limit and stability conditions for the spin glass state in the spinel families based on the two matrices CuCr2S4and CuCr2Se4doped by Sb ions

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Influence of Substitution of the Chromium Ions by the Nonmagnetic Sb and Al Ions on the Magnetization Processes in CuCr₂X₄(X = S, Se) Spinels

Influence of Substitution of the Chromium Ions by the Nonmagnetic Sb and Al Ions on the Magnetization Processes in CuCr₂X₄(X = S, Se) Spinels

Percolation limit and stability conditions for the spin glass state in the spinel families based on the two matrices CuCr₂S₄and CuCr₂Se₄doped by Sb ions