Weak ferromagnetism in CdMnZnTe single crystal

Hwang, Younghun; Chung, Soo‐seong; Um, Youngho

doi:10.1002/pssc.200777158

Cited by 7 publications

(5 citation statements)

References 10 publications

(10 reference statements)

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“…The great interest in the quaternary semiconductors Cd1-x-yMnxZnyTe arises out of the additional control of the growth and material parameters, such as controlling the band-gap value while fixing the lattice constant. In contrast to the ternary Cd1-xMnxTe compound, where the band-gap increases with increasing Mn concentration [7,8], in the Cd1-x-yMnxZnyTe system, it is possible to change the concentrations of Zn and Mn without changing the band-gap value [9].…”

Section: Introductionmentioning

confidence: 98%

Thermodynamics and crystal growth of Cd1-x-yMnxZnyTe (x=0.10, 0.20, y=0.15)

Kopach

Shcherbak

et al. 2021

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXIII

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In this work the structural, optical and electrical properties of Cd1-x-yMnxZnyTe single crystals (x=0.10, 0.20, y=0.15) grown by the vertical Bridgman method were investigated. Based on differential thermal analysis (DTA) results, it was found that the crystallization rate increases as the crystallization temperature (Ts) decreases. It is determined that the volume fraction of solid phase in Cd0.75Mn0.10Zn0.15Te and Cd0.65Mn0.20Zn0.15Te alloys decrease to a minimum in the temperature ranges 1366-1389 K and 1363-1388 K, respectively. The activation energies of melting and crystallization processes for these alloys under different conditions are established. The linear character of the dependence between the preexponential factor (lnϕsol.phase,0 and lnVmelt., sol. phase,0) and the activation energy of these processes is determined, which is evidence of a compensation effect. The band-gap value was estimated to be ~ 1.73 eV for Cd0.75Mn0.10Zn0.15Te and ~1.84 eV for Cd0.65Mn0.20Zn0.15Te at 300 K. Typical transmission images showed the presence of small Te inclusions (5-10 µm) in the crystals. The electrical resistivity, obtained from the I-V curves, was ~10 4 Ώ•cm for both crystals and decreased slightly toward the end of the ingots.

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Section: Introductionmentioning

confidence: 98%

Thermodynamics and crystal growth of Cd1-x-yMnxZnyTe (x=0.10, 0.20, y=0.15)

Kopach

Shcherbak

et al. 2021

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXIII

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Section: Introductionmentioning

confidence: 99%

“…In the past, the diluted magnetic semiconductors Cd1-x-yMnxZnyTe attracted attention of researchers due to their magneto-optical properties, the band-gap width, Faraday rotation [2,3] and ferromagnetism in Cd1-yMn0.35ZnyTe single crystals [4]. Until now CMZT crystals were grown by a VB method [1][2][3] and the temperature-gradient solution method [4]. However, in these studies, no information was available regarding the liquidus-solidus temperatures in the composition range for the Cd1-x-yMnxZnyTe solid solutions [2][3][4] beyond a diagram for the Cd1-x-yMnxZnyTe pseudoternary alloys [1] showing the concentration dependencies for constant lattice parameters.…”

Section: Introductionmentioning

confidence: 99%

“…Until now CMZT crystals were grown by a VB method [1][2][3] and the temperature-gradient solution method [4]. However, in these studies, no information was available regarding the liquidus-solidus temperatures in the composition range for the Cd1-x-yMnxZnyTe solid solutions [2][3][4] beyond a diagram for the Cd1-x-yMnxZnyTe pseudoternary alloys [1] showing the concentration dependencies for constant lattice parameters.…”

Section: Introductionmentioning

confidence: 99%

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Properties of Cd0.90-xMnxZn0.10Te (x = 0.10, 0.20) crystals grown by Vertical Bridgman method

Kopach

Kanak

et al. 2018

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XX

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The correlation between Cd0.90-xMnxZn0.10Te (CMZT) melt state and structural properties of the crystals, grown by vertical Bridgman method, was investigated. The Cd0.9-xMnxZn0.1Te crystals with various Mn compositions (x = 0.1 and 0.2) were grown by a two-step method from high-purity elemental components. We have conducted a series of crystal growth runs with different degrees of melt superheating over the alloy's melting temperature. We obtained ingots with various crystalline structures and properties. It was concluded that the best crystals were grown from the melt with a thermal gradient of about 5 °C/cm during growth process. We have found that the band-gap increases (from 1.67 eV at x=0.1 to 1.79 eV at x=0.2) with Mn content.

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“…Heteroatom doping is another strategy to tune the activity of M-N-C catalysts. Zhang et al used different S precursors to treat the Co ZIF-67, and they found that the S incorporation could result in a greater N content and a higher ratio of pyridinic N; thus a remarkably enhanced ORR activity(Figure 2-15b)86 . Besides, to avoid the aggregation of Co atoms during the pyrolysis, Zn 2+ can be added into the Co MOF to expand the Co interatomic distance(Figure 2-15c)87 .…”

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confidence: 99%

Defect engineering of nonprecious metal based catalysts for oxygen evolution reaction

Zhuang¹

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As a branch of catalysis, electrocatalytic energy conversion reactions have been extensively studied and widely applied in industry. Hydrogen evolution reaction (HER), oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) are the most common electrocatalytic reactions, which have been utilized in water splitting, fuel cells, and zinc-air batteries, and so on. The ideal benchmark catalysts for these reactions are noble metal based catalysts, like platinum (Pt), ruthenium (Ru) and iridium (Ir). However, their high cost and instable catalytic performance during long-term usage make it impractical to use them on a massive scale. To develop a commercially affordable electrocatalyst with a promising activity, a series of catalysts originated from the defective two-dimensional (2D) nanomaterials emerged, such as carbon, transition metal oxides and transition metal dichalcogenides. Their atomic thickness, large lateral size, high surface-to-volume atom ratio and large specific surface area render them promising for numerous applications, such as (electro)catalysis, electronics, sensors, energy storage and conversion, and so on. Meanwhile, the defects existed on these 2D materials can significantly tailor their intrinsic physical properties even in an extremely low concentration, and thus great efforts have been devoted into the artificially surface defect engineering. But there are three major challenges that need to be

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Weak ferromagnetism in CdMnZnTe single crystal

Cited by 7 publications

References 10 publications

Thermodynamics and crystal growth of Cd1-x-yMnxZnyTe (x=0.10, 0.20, y=0.15)

Thermodynamics and crystal growth of Cd1-x-yMnxZnyTe (x=0.10, 0.20, y=0.15)

Properties of Cd0.90-xMnxZn0.10Te (x = 0.10, 0.20) crystals grown by Vertical Bridgman method

Defect engineering of nonprecious metal based catalysts for oxygen evolution reaction

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