Effects of Incommensuracy on the Structural and Electrical Properties in PbTe-Bi Superlattice Films

Structural And Electrical Properties

X Ray ◽

Growth Orientation ◽

AbstractWe studied the structural and electrical transport properties of incommensurate PbTe-Bi superlattice films. The properties of those samples were noticeably different from those of commensurate samples. For the incommensurate samples, the satellite peaks, in the 9–29 x-ray scans along the [111] growth orientation, became broader and the ratio of satellite intensities to the Bragg intensity became smaller. The resistances of incommensurate samples were about three times larger than those of corresponding commensurate ones. These features are interpreted by an enhancement of the lateral nonuniformity of interfaces in incommensurate samples. The exponential dependence of the resistance on temperature in incommensurate samples was also in contrast to the logarithmic behavior observed in commensurate ones.

Structural and electrical properties of ZnO/Zn0.85Mg0.15O thin film prepared by pulsed laser deposition

International Journal of Modern Physics B ◽

10.1142/s0217979217440568 ◽

2017 ◽

Vol 31 (16-19) ◽

pp. 1744056 ◽

Author(s):

Jing-Jing Yang ◽

Gang Wang ◽

Wen-Han Du ◽

Chao Xiong

Keyword(s):

Electrical Properties ◽

Electrical Transport ◽

Lattice Structure ◽

Quantum Effect ◽

Impurity Scattering ◽

Hexagonal Wurtzite Structure ◽

Typical Material ◽

Structural And Electrical Properties ◽

Dimensional Electron Gas

The electrical transport properties are the key factors to determine the performance of ZnO-based quantum effect device. ZnMgO is a typical material to regulate the band of ZnO. In order to investigate the electrical properties of the interface of ZnO/Zn[Formula: see text]Mg[Formula: see text]O films, three kinds of ZnO/Zn[Formula: see text]Mg[Formula: see text]O films have been fabricated with different thickness. After comparing the structural and electrical properties of the samples, we found that the independent Zn[Formula: see text]Mg[Formula: see text]O hexagonal wurtzite structure (002) peak can be detected in XRD spectra. Hall-effect test data confirmed that the two-dimensional electron gas (2DEG) became lower because of the decrease of thickness of Zn[Formula: see text]Mg[Formula: see text]O films, increase of impurity scattering and lattice structure distortion caused by the increase of Mg content.

Non-Stoichiometry and Structure of SrCe1-xYbxO3 Perovskite-Type Oxides

MRS Proceedings ◽

10.1557/proc-453-519 ◽

1996 ◽

Vol 453 ◽

Author(s):

Igor Kosacki ◽

Mark Shumsky ◽

Harlan U. Anderson

Keyword(s):

Electrical Conductivity ◽

Electrical Properties ◽

Charge Carrier ◽

Structural Properties ◽

Electrical Transport ◽

Structural Disorder ◽

X Ray Diffraction ◽

X Ray ◽

Structural And Electrical Properties ◽

Perovskite Type

AbstractThe structural and electrical properties of SrCe1-xYbxO3 ceramics have been studied as a function of temperature and Yb-concentration using x-ray diffraction and impedance techniques. The influence of Yb-dopants on electrical transport and structural disorder has been studied. A correlation between the structural properties, electrical conductivity is observed and discussed. These measurements allow us to determine the mechanism of charge carrier compensation and also the concentration and mobility of the electrical species.

Phase Formation and Electrical Transport Properties of Nano-Sized SnO2 Added (Tl0.85Cr0.15)Sr2CaCu2O7-δ Superconductors

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.268.315 ◽

2017 ◽

Vol 268 ◽

pp. 315-319 ◽

Author(s):

Wei Kong ◽

Ing Kong ◽

Mohd Mustafa Awang Kechik ◽

Roslan Abd-Shukor

Keyword(s):

Critical Current Density ◽

Transport Properties ◽

Critical Current ◽

Phase Formation ◽

Current Density ◽

Electrical Transport ◽

Energy Dispersive ◽

Transport Critical Current Density ◽

X Ray

In this work, the effect of nano-sized SnO2 addition on the phase formation and electrical transport properties of (Tl0.85Cr0.15)Sr2CaCu2O7-δ (Tl-1212) superconductor was investigated. Thallium-based high temperature superconductor (HTS) with nominal starting composition (Tl0.85Cr0.15) Sr2CaCu2O7-δ was prepared using high purity oxide powders via solid state reaction method. Nano-sized SnO2 with 0.01 – 0.05 wt.% were added into Tl-1212 superconductors. The characteristic of the samples were determined by powder X-ray diffraction method (XRD), scanning electron microscopy (SEM), energy dispersive X-Ray analysis (EDX), electrical resistance measurements and transport critical current density measurements. Nano-sized SnO2 added (Tl0.85Cr0.15)Sr2CaCu2O7-δ showed Tc-zero between 93 and 95 K. All of the samples indicated a dominant phase of Tl-1212 with a minor phase of Tl-1201. The highest Jc (at 77 K) was shown by sample with 0.03 wt.% at 3260 mA/cm2. SnO2 has significantly enhanced the transport critical current density of Tl-1212 superconductor by acting as flux pinning centers. However, further addition of nano-sized SnO2 in Tl-1212 superconductor caused degradation in Jc. The SEM micrographs with energy dispersive X-Ray analysis (EDX) showed that SnO2 were well distributed in all the samples.

Structural and electrical properties of Nd1.7Ba0.3Ni0.9Cr0.1O4+δ compound

Powder Diffraction ◽

10.1017/s0885715612000474 ◽

2012 ◽

Vol 27 (3) ◽

pp. 184-188 ◽

Cited By ~ 3

Author(s):

Manel Jammali ◽

Rached Ben Hassen ◽

Jan Rohlicek

Keyword(s):

Electrical Transport ◽

Small Polaron ◽

Sol Gel ◽

Polycrystalline Sample ◽

Xrd Analysis ◽

Structural And Electrical Properties

Polaron Hopping ◽

X Ray ◽

Cell Parameters ◽

The Nd1.7Ba0.3Ni0.9Cr0.1O4+δ polycrystalline sample was synthesized by the sol–gel process and a subsequent annealing at 1523 K in 1 atm of flowing argon. X-ray diffraction (XRD) analysis and electrical transport properties have been investigated as well. The oxygen non-stoichiometry was determined by iodometric titration. The sample shows adoption of the K2NiF4-type structure based on a tolerance factor calculation. Rietveld refinement of the crystal structure from X-ray powder diffraction data confirmed that Nd1.7Ba0.3Ni0.9Cr0.1O4+δ adopts the tetragonal structure (space group I4/mmm, Z = 2). The room temperature unit-cell parameters are determined to be a = 3.82515(2) and c = 12.47528(6) Å. The reliability factors are: RB = 0.043, Rwp = 0.012 and χ2 = 3.00. The Nd1.7Ba0.3Ni0.9Cr0.1O4+δ compound exhibits a semi-conductive behaviour. The electrical transport mechanism has been investigated and it agrees with the adiabatic small polaron hopping model in the temperature range 313 K ≤ T ≤ 708 K.

Study of Structural and Electrical Transport Properties of Polycrystalline La1-XCaXMnO3 (x=0.33, 0.5 and 0.9) Prepared by a Co-Precipitation Method

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.652-654.576 ◽

2013 ◽

Vol 652-654 ◽

pp. 576-580 ◽

Cited By ~ 2

Author(s):

Mya Theingi ◽

Ji Ma ◽

Hui Zhang ◽

Xiang Gao ◽

Jian Hong Yi ◽

...

Keyword(s):

Transport Properties ◽

Electrical Transport ◽

Perovskite Phase ◽

Precipitation Method ◽

X Ray Diffraction ◽

X Ray ◽

Manganite Perovskite ◽

Polycrystalline Ceramics ◽

Co Precipitation

Manganite perovskite La1-xCaxMnO3(x=0.33, 0.5 and 0.9) have been prepared by chemical co-precipitation method. Ammonium carbonate was used to coprecipitate lanthanum, calcium and manganese ions as carbonates under basic condition. This precursor on calcining at 900°C yields La-Ca-Mn-O perovskite phase. Follow by sintering at 1200°C after the powders were pressed into pellets gave La1-xCaxMnO3(LCMO) polycrystalline ceramics. The crystal phases of the resulting powders and ceramics were examined by X-ray diffraction (XRD) technique. The morphology of the powders was observed by scanning electron microscopy (SEM) and electrical transport properties of ceramics were measured by conventional four-point probe technique.

X-ray photoemission, calorimetric, and electrical transport properties of CeCu4MnyAl1−y

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2014.02.117 ◽

2014 ◽

Vol 601 ◽

pp. 43-49 ◽

Cited By ~ 5

Author(s):

K. Synoradzki ◽

T. Toliński ◽

G. Chełkowska ◽

A. Bajorek ◽

M. Zapotoková ◽

...

Keyword(s):

Transport Properties ◽

Electrical Transport ◽

X Ray

Structural, Magnetic, and Transport Properties of La0.62Sb0.38MnO3 Ceramic

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.800.398 ◽

2013 ◽

Vol 800 ◽

pp. 398-401 ◽

Author(s):

Qiang Wang ◽

Ping Duan ◽

Ji You Wang ◽

Lei Chang ◽

Jin Liang Zhao ◽

...

Keyword(s):

Transport Properties ◽

Electrical Transport ◽

State Transition ◽

Ferromagnetic State ◽

Solid State Reaction Method ◽

X Ray Diffraction ◽

Hexagonal Crystal ◽

Metal Insulator ◽

X Ray

The polycrystalline La0.62Sb0.38MnO3 sample has been prepared by the solid-state reaction method. Structural, magnetic and electrical transport properties have been researched. X-ray diffraction analysis confirms the hexagonal crystal symmetry. Magnetization measurements indicate La0.62Sb0.38MnO3 experienced from paramagnetic to ferromagnetic state transition with decreasing temperature at about 225 K. Resistivity dependences on temperature exhibit metal-insulator transition (MIT), and the maximum magnetoresistance (MR) ratio is about 33 % at temperature of 189 K and magnetic field of 2 T.

Correlation of Microstructures with Electrical Transport Properties in Mn Doped Co Nanoferrite Particles

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.510-511.487 ◽

2012 ◽

Vol 510-511 ◽

pp. 487-492

Author(s):

M. Akram ◽

M. Anis-ur-Rehman ◽

S. Nasir ◽

G. Asghar

Keyword(s):

Electrical Resistivity ◽

Transport Properties ◽

Cation Distribution ◽

Electrical Transport ◽

Research Work ◽

Precipitation Method ◽

X Ray Diffraction ◽

Dc Electrical Resistivity ◽

X Ray

Magnetic nanocomposites are offering a variety of novel features and tune able properties, mainly depending on particle size, cation distribution, morphology and porosity of the prepared materials. The aim of this research work is to understand the effects of Mn doping on the microstructures and hence consequences on the electrical transport properties with shift of cation distribution in CoFe2O4. Co1-xMnxFe2O4nanocrystallite particles with stoichiometric proportion (x) varying from 0.0 to 1.0 were prepared by co-precipitation method. X-ray diffraction patterns confirmed the FCC spinel structure of synthesized particles. The crystal structure is found to be inverse cubic spinel with a space group Fd3m and the lattice constants ranges from 8.36 Å to 8.46 Å The crystallite sizes were calculated from the most intense peak (311) using the Debye-Scherrer formula for all the samples those were synthesized at reaction temperature of 70°C. Then samples were sintered at 600°C for 3 hours, characterized by X-ray diffraction at room temperature and DC electrical resistivity measurements were done as a function of temperature by two-probe method from 370 K to 690 K. The measurements showed that DC electrical resistivity decreased with increase in temperature ensuring the semiconductor nature of the material in this temperature range. DC electrical resistivity results were discussed in terms of polaron hopping model under the effects of cation distribution. AC electrical properties were also analyzed. All the observed properties were correlated with observed microstructures.

A Comparative Study of Structural, Optical and Electrical Properties of Fe-ZnO Nanoparticles Synthesized by Precipitation and Microwave Method for Photovoltaic Applications

Journal of Energy and Power Technology ◽

10.21926/jept.2103035 ◽

2021 ◽

Vol 03 (03) ◽

pp. 1-1

Author(s):

Ganga R. Neupane ◽

◽

Amrit Kaphle ◽

David N. Mcllroy ◽

Elena Echeverria ◽

...

Keyword(s):

Electrical Properties ◽

Structural Properties ◽

Zno Nanoparticles ◽

Photoelectron Spectroscopy ◽

Electrical Transport ◽

Precipitation Method ◽

Microwave Method ◽

Optical And Electrical Properties ◽

X Ray

Iron doped ZnO (Fe-ZnO) nanoparticles were synthesized using two techniques that are economical as well as scalable to yield tunable properties of nanoparticles for facilitating down conversion in an absorbing layer of a solar cell. To evaluate the suitability of Fe-ZnO nanoparticles prepared by two deposition methods, we present a comparison of optical, electrical, and structural properties of Fe-ZnO using several experimental techniques. Structural properties were analyzed using transmission electron microscopy and x-ray diffraction spectroscopy (XRD) with Rietveld analysis for extracting information on compositional variations with Fe doping. The chemical composition of nanoparticles was analyzed through X-ray photoelectron spectroscopy (XPS). The optical properties of nanoparticles were studied using photoluminescence and UV-Vis absorption spectroscopy. In addition, fluorescence lifetime measurement was also performed to study the changes in an exponential decay of lifetimes. The electrical transport properties of Fe-ZnO were analyzed by impedance spectroscopy. Our studies indicate that ethanol as a solvent in a microwave method would produce smaller nanoparticles up to the size of 11 nm. In contrast, the precipitation method produces secondary phases of Fe2O3 beyond 5% doping. In addition, our studies show that the optical and electrical properties of resulting Fe-ZnO nanoparticles depend on the particle sizes and the synthesis techniques used. These new results provide insight into the role of solvents in fabricating Fe-ZnO nanoparticles by precipitation and microwave methods for photovoltaic and other applications.

Structure, Magnetic and Transport Properties of MnxGe1-x

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.47-50.570 ◽

2008 ◽

Vol 47-50 ◽

pp. 570-574

Author(s):

Shuang Qiao ◽

Deng Lu Hou ◽

Qian Zhang ◽

Cong Mian Zhen

Keyword(s):

Transport Properties ◽

Photoelectron Spectroscopy ◽

Electrical Transport ◽

Deep Level ◽

Magnetic Domain ◽

Secondary Phase ◽

X Ray ◽

Increasing Temperature ◽

Mn Concentration

Ge1-xMnx (x=0.05, 0.07, 0.11, 0.15, 0.19, 0.23, 0.26, 0.29) thin films were prepared by magnetron sputtering. All the films had a Ge cubic structure, and no indication of a secondary phase was found in any sample using X-ray diffraction (XRD). The crystal lattice constant increases with the Mn concentration, in accordance with Vegard's law. No films show clear magnetic domain structure under a magnetic force microscope (MFM). Atom force microscope (AFM) measurements show that all films have a uniform particle size distribution, and a columnar growth pattern. X-ray photoelectron spectroscopy (XPS) measurements indicate that the Mn atoms are not singlely in the bivalent. Electrical transport properties show that the resistance of the films increases with increasing Mn concentration, suggesting that the Mn ions are in deep-level acceptor states, while resistance decreases with increasing temperature, which is a typical semiconductor property.