Investigation into the Structural and Electrical Properties of Silver-Intercalated Zirconium Diselenide
TL;DR: In this paper, the phase diagram of the AgxZrSe2 compound was determined in the temperature range 423 −523 K and at room temperature, which indicated a polaron nature of charge-carrier localization.
Abstract: Silver-intercalated zirconium diselenides of the general formula AgxZrSe2 are synthesized for the first time. The phase diagram of the AgxZrSe2 compound is determined in the temperature range 423–523 K and at room temperature. An analysis has revealed the coexistence of two compounds, namely, Ag0.125ZrSe2 and Ag0.25ZrSe2, of which only the latter compound is stable at room temperature. The structural and electrical properties of AgxZrSe2 diselenides are investigated. The results obtained indicate a polaron nature of charge-carrier localization. A comparison with isostructural intercalation compounds shows that free charge carriers play a dominant role in screening of the impurity potential.
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TL;DR: In this paper, the electrical properties of intercalated Ag and HfSe2 compounds have been investigated for the first time using various current electrodes, which make it possible to pass either the electron current or the ion current across the sample.
Abstract: The electrical properties of intercalated Ag
x
HfSe2 compounds (x = 0.1, 0.2) have been investigated for the first time. Investigations have been performed using various current electrodes, which make it possible to pass either the electron current or the ion current across the sample. Polarization effects, which indicate the self-consistent migration of charge carriers in the samples, have been found for the samples at room temperature. Based on the characteristic features of polarization decay, coefficients of conjugated chemical diffusion have been evaluated.
7 citations
24 Jun 2020
TL;DR: The synthesis and characterization of Fe-intercalated ZrSe2 thin films on quartz substrates are demonstrated using the low-pressure chemical vapor deposition of the single-source precursor [Fe(η5-C5H4Se)2Zr(ε5- C5H5)2]2.
Abstract: Transition metal chalcogenide thin films of the type FexZrSe2 have applications in electronic devices, but their use is limited by current synthetic techniques Here, we demonstrate the synthesis a
6 citations
6 citations
01 Feb 2020
TL;DR: In this paper, the influence of Dopant Concentration on polycrystalline Ytterbium-doped ZrSe (Yb-ZrSe) material for possible photovoltaic application using the electrochemical deposition method was investigated.
Abstract: This research focus on the Influence of Dopant Concentration on Polycrystalline Ytterbium-doped ZrSe (Yb-ZrSe) material for possible photovoltaic application using the electrochemical deposition method. The cationic precursor was an aqueous solution of 0.01 mol ZrOCl2.8H2O while the anionic precursor was 0.15 mol selenium was prepared by dissolving with 5 ml of Hydrochloric acid (HCl), and then 0.05 mol Yb (NO3)3.5H2O was used as the dopant. The films were characterized using UV-1800 Visible Spectrophotometer, Bruker D8 Advance x-ray diffractometer with Cu Kα line (λ = 1.54056 A) in 2θ range from 10°–90°and Scanning Electron Microscopy. X-ray diffraction (XRD) of the deposited films on FTO substrate studies reveals that films are polycrystalline by exhibiting diffraction peaks at (111), (200), (200) and (210) corresponds to the following angle (27.00°), (38.01°), (46.02°), (66.02°). (SEM) revealed that the grain size was uniformly distributed on the surface of the substrate. The optical band gap energy was obtained.
5 citations
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TL;DR: In this paper, the effects of intercalation of the layer type transition metal dichalcogenides by a variety of organic molecules, alkali metals, or 3D transition metals are discussed.
Abstract: Intercalation of the layer type transition metal dichalcogenides by a variety of organic molecules, alkali metals, or ‘3d’ transition metals, provides a powerful way to finely tune the electron occupation of the relatively narrow ‘d’ bands met in these solids These transition metal dichalcogenides are highly anisotropic solids, sometimes referred to as ‘two-dimensional’ solids, and the intercalant molecules which are electron donors enter between the layers This can result in profound changes in the electronic properties of the host lattice, and these changes can be understood in terms of charge transfer and increased interlayer separation The phenomena discussed include optical properties, transport properties, super-conductivity, order-disorder phenomena and phase changes, staging, magnetic properties, metal-insulator transitions, Anderson localization, and fast-ion conduction Some possible practical applications are also considered
597 citations
TL;DR: In this article, the main features of the electronic structure of transition metal layered dichalcogenides can be calculated in a simple ab initio atomic orbital framework, based on the properties of groups IV, V and VI of the transition series.
Abstract: It is shown that the main features of the electronic structure of transition metal layered dichalcogenides can be calculated in a simple ab initio atomic orbital framework. Examples from Groups IV, V and VI of the transition series are considered.
119 citations
TL;DR: In this paper, the activity of copper in cuprous sulfide as a function of the copper-to-sulfur ratio has been determined with the help of coulometric titrations.
Abstract: The activity of copper in cuprous sulfide as a function of the copper‐to‐sulfur ratio has been determined with the help of coulometric titrations. The homogeneity range of cuprous sulfide at 400°C extends from a copper‐to‐sulfur ratio of 1.9996±0.0002 for samples coexisting with metallic copper to a ratio of less then 1.93 for samples coexisting with digenite (Cu1.8S). The ratio of the effective mass of electron holes to that of the free electron has been found to be 7±2 at 435°C. Preliminary conductivity measurements suggest a considerable increase of the mobility of electron holes with an increasing copper deficit of the samples presumably due to fewer collisions of electron holes with excess electrons.
81 citations
TL;DR: In this article, the effect of intercalation of 3D metals into TiS2 layers on the electronic properties is discussed, which can be explained by a simple model, which takes into account a temperatureindependent residual term and intra-and intervalley scattering by acoustic phonons.
Abstract: The temperature dependence of electrical resistivity and thermoelectric power of the intercalation compounds of MxTiS2 (M = Mn, Fe, Co, and Ni; 0 ≦ x ≦ 1/3) with layered structures are measured over the temperature range 1.5 to 300 K. These experimental results can be explained by a simple model, which takes into account a temperature-independent residual term and intra- and intervalley scattering by acoustic phonons. It is also shown that a phonon drag effect is effective for the thermopower. The effect of intercalation of 3d metals into TiS2 layers on the electronic properties is discussed.
Die Temperaturabhangigkeit des elektrischen Widerstands und der Thermospannung der Interkalate von MxTiS2 (M = Mn, Fe, Co, und Ni; 0 ≦ x ≦ 1/3) mit Schichtstrukturen werden bei Temperaturen von 1,5 bis 300 K gemessen. Die experimentellen Ergebnisse konnen durch ein einfaches Modell erklart werden, das einen temperaturunabhangigen Restterm sowie „intra- und intervalley scattering” durch akustische Phononen berucksichtigt. Es wird auch gezeigt, das ein „phonon-drag”-Effekt fur die Thermospannung wirksam ist. Der Einflus der Interkalation von 3d-Metallen in die TiS2-Schichten auf die elektronischen Eigenschaften wird diskutiert.
40 citations
TL;DR: In this paper, the authors present a set of experimental data on the Li x ZrSe 2 system as a function of x, including X ray, electrochemical, conductivity, NMR and EPR measurements.
Abstract: We present a set of experimental data on the Li x ZrSe 2 system as a function of x, including X ray, electrochemical, conductivity, NMR and EPR measurements. All experiments confirm the occurence of a non-metal to metal transition as a function of concentration at about x = 0.4 as previously suggested from 77 Se NMR results. At the transition lattice parameters change abruptly within the same symmetry group. In the concentration range 0 7 Li and 77 Se NMR as well as EPR results show the absence of a large concentration of electronic magnetic moments. This suggest that the electrons given up by the Li are localized as diamagnetic pairs or clusters up to the percolation limit.
34 citations