Synthesis, crystal structure and characterization of monocrystalline ZnCr2Se4 doped with neodymium

Jendrzejewska, Izabela; Groń, T.; Kusz, Joachim; Barsova, Zoia; Pietrasik, Ewa; Goryczka, Tomasz; Sawicki, B.; Ślebarski, A.; Fijałkowski, Marcin; Jampílek, Josef; Duda, H.

doi:10.1016/j.jssc.2020.121661

Cited by 4 publications

(12 citation statements)

References 30 publications

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“…On the other hand, the presence of Ta 3+ ions is a kind of “impurity”, which induces a change in the endothermic peak position. Similar behaviour was observed in the (Zn 1-x Nd x ) Cr 2 Se 4 system [ 20 ].…”

Section: Resultssupporting

confidence: 82%

“…The methods used to determine the electrical properties and specific heat are described in detail in [ 17 , 18 , 20 ]. Thermogravimetry and differential scanning calorimetry (TG/DSC) were carried out using a Labsys Evo system, with a heating rate of 5 °C/min and in an inert gas atmosphere (Ar).…”

Section: Methodsmentioning

confidence: 99%

“…The most important factors are: (a) the size of the ion radius, (b) the position of the ion in the spinel structure (tetra- or octahedral), (c) the coordination number (CN), (d) the type of chemical bond [ 12 ]. Substitution of an additional cation into the ZnCr 2 Se 4 matrix resulted in such phenomena as the appearance of spin glass [ 13 , 14 , 15 ], polaron conductivity [ 16 ], ferrimagnetism [ 17 ] and the enhancement of both FM [ 18 , 19 ] and AFM interactions [ 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

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Study of the Structure, Magnetic, Thermal and Electrical Characterisation of ZnCr2Se4: Ta Single Crystals Obtained by Chemical Vapour Transport

et al. 2021

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The new series of single-crystalline chromium selenides, Ta-doped ZnCr2Se4, was synthesised by a chemical vapour transport method to determine the impact of a dopant on the structural and thermodynamic properties of the parent compound. We present comprehensive investigations of structural, electrical transport, magnetic, and specific heat properties. It was expected that a partial replacement of Cr ions by a more significant Ta one would lead to a change in direct magnetic interactions between Cr magnetic moments and result in a change in the magnetic ground state and electric transport properties of the ZnCr2−xTaxSe4 (x = 0.05, 0.06, 0.07, 0.08, 0.1, 0.12) system. We found that all the elements of the cubic system had a cubic spinel structure; however, the doping gain linearly increased the ZnCr2−xTaxSe4 unit cell volume. Doping with tantalum did not significantly change the semiconductor and magnetic properties of ZnCr2Se4. For all studied samples (0 ≤ x ≤ 0.12), an antiferromagnetic order (AFM) below TN~22 K was observed. However, a small amount of Ta significantly reduced the second critical field (Hc2) from 65 kOe for x = 0.0 (ZnCr2Se4 matrix) up to 42.2 kOe for x = 0.12, above which the spin helical system changed to ferromagnetic (FM). The Hc2 reduction can lead to strong competition among AFM and FM interactions and spin frustration, as the specific heat under magnetic fields H < Hc2 shows a strong field decrease in TN.

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Section: Resultssupporting

confidence: 82%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study of the Structure, Magnetic, Thermal and Electrical Characterisation of ZnCr2Se4: Ta Single Crystals Obtained by Chemical Vapour Transport

et al. 2021

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“…The electrical conductivity, σ(T), was measured by the dc method using a KEITHLEY 6517B Electrometer/High Resistance Meter (Keithley Instruments, L.L.C., Solon, OH, USA) in the temperature range of 77–400 K. The activation energy, E a , was determined below room temperature and in the temperature range of 300–400 K from the formula

, where k is the Boltzmann constant and σ 0 is the reference conductivity. The details of methods used to determine the electrical properties, thermal analysis, and specific heat are described in [ 37 , 39 , 41 , 44 ].…”

Section: Methodsmentioning

confidence: 99%

“…Our group’s work has been done based on the ZnCr 2 Se 4 matrix. This matrix has been doped with both non-magnetic ions, such as, for example, Al [ 26 , 27 , 28 ], Cu [ 17 , 18 , 19 , 29 , 30 ], Ga [ 17 , 18 , 31 , 32 , 33 ], In [ 18 , 33 , 34 ], Sn [ 35 , 36 ], and Ta [ 37 ], and with magnetic ones, such as, for example, Dy [ 38 , 39 ], Gd [ 40 ], Ho [ 41 ], Mn [ 42 , 43 ], Nd [ 44 ], and Ni [ 45 ]. All the above-mentioned doped spinels have two features in common.…”

Section: Introductionmentioning

confidence: 99%

The Zn1−xPbxCr2Se4—Single Crystals Obtained by Chemical Vapour Transport—Structure and Magnetic, Electrical, and Thermal Properties

et al. 2022

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Monocrystalline chalcogenide spinels ZnCr2Se4 are antiferromagnetic and semiconductor materials. They can be used to dope or alloy with related semiconducting spinels. Therefore, their Pb-doped display is expected to have unique properties and new potential applications. This paper presents the results of dc and ac magnetic measurements, including the critical fields visible on the magnetisation isotherms, electrical conductivity, and specific heat of the ZnCr2S4:Pb single crystals. These studies showed that substituting the diamagnetic Pb ion with a large ion radius for the Zn one leads to strong short-range ferromagnetic interactions in the entire temperature range and spin fluctuations in the paramagnetic region at Hdc = 50 kOe.

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Effect of Ho3+ Substitution on Magnetic Properties of ZnCr2Se4

Jendrzejewska,

Groń,

Tomaszewicz

et al. 2024

IJMS

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A series of ZnCr2−xHoxSe4 microcrystalline spinels (where x = 0.05, 0.075, and 0.10) containing holmium ions in octahedral coordination were obtained by sintering of adequate reactants at high temperatures. The obtained doped materials were characterized by X-ray diffraction, Scanning Electron Microscopy, UV–Vis–NIR, molecular field approximation, and XPS spectroscopies. Their thermal properties were also investigated. The doping of the ZnCr2S4 matrix with paramagnetic Ho3+ ions with a content of not more than 0.1 and a screened 4f shell revealed a significant effect of orbital and Landau diamagnetism, a strong reduction in short-range ferromagnetic interactions, and a broadening and shift of the peak of the first critical field by simultaneous stabilization of the sharp peak in the second critical field. These results correlate well with FPLO calculations, which show that Cr sites have magnetic moments of 3.19 µB and Ho sites have significantly larger ones with a value of 3.95 µB. Zn has a negligible magnetic polarization of 0.02 µB, and Se induces a polarization of approximately −0.12 µB.

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Synthesis, crystal structure and characterization of monocrystalline ZnCr2Se4 doped with neodymium

Cited by 4 publications

References 30 publications

Study of the Structure, Magnetic, Thermal and Electrical Characterisation of ZnCr2Se4: Ta Single Crystals Obtained by Chemical Vapour Transport

Study of the Structure, Magnetic, Thermal and Electrical Characterisation of ZnCr2Se4: Ta Single Crystals Obtained by Chemical Vapour Transport

The Zn1−xPbxCr2Se4—Single Crystals Obtained by Chemical Vapour Transport—Structure and Magnetic, Electrical, and Thermal Properties

Effect of Ho3+ Substitution on Magnetic Properties of ZnCr2Se4

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