A microcontact impedance study on NASICON-type Li1+xAlxTi2−x(PO4)3(0 ≤ x ≤ 0.5) single crystals

2016 ◽  
Vol 4 (4) ◽  
pp. 1506-1513 ◽  
Author(s):  
D. Rettenwander ◽  
A. Welzl ◽  
S. Pristat ◽  
F. Tietz ◽  
S. Taibl ◽  
...  
Keyword(s):  
Impedance Spectroscopy ◽  
Grain Boundaries ◽  
Single Crystals ◽  
Solid Electrolytes ◽  
Bulk Conductivity ◽  
Impedance Study ◽  
Nasicon Type ◽  
Microstructural Effects

We successfully demonstrated the applicability of microcontact impedance spectroscopy (MC IS) on Li+conducting solid electrolytes and measured the Li+bulk conductivity (σb) of LiTi2(PO4)3(LTP) and Li1+xAlxTi2−x(PO4)3(LATP) single crystals independent of microstructural effects (e.g., grain boundaries, pores, and density).

Impedanzmessungen an Tetraiodomercuraten/Impedance Spectroscopy of Tetraiodomercurates

1992 ◽  
Vol 47 (1) ◽  
pp. 17-21 ◽  
Author(s):  
K. Brodersen ◽  
H. Göhr ◽  
J. Schrenk
Keyword(s):  
Phase Transitions ◽  
Impedance Spectroscopy ◽  
Single Crystal ◽  
Grain Boundaries ◽  
Single Crystals ◽  
Double Layer ◽  
Powder Sample ◽  
Ionic Mobilities

As thermochromic compounds, tetraiodomercurates show phase transitions, which have been investigated by impedance spectroscopy. In the case of Ag2HgI4 and Cu2HgI4 we found clear changes of conductivity not present with HgI2. In all cases the main resistance is caused by the grain boundaries between the single crystals of the powder sample. Also diffusion in the double layer in front of the surface of the electrodes influences the spectra. Single crystal measurements of Hgl, show the different ionic mobilities along the various crystallographic directions.

Characterization of NASICON-type Na solid electrolyte ceramics by impedance spectroscopy

2014 ◽  
Vol 07 (06) ◽  
pp. 1440002 ◽  
Author(s):  
E. Kazakevičius ◽  
A. Kežionis ◽  
L. Žukauskaitė ◽  
M. Barré ◽  
T. Šalkus ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Impedance Spectroscopy ◽  
Gas Sensors ◽  
Solid Electrolytes ◽  
Pechini Method ◽  
Impedance Spectra ◽  
Phase Purity ◽  
Nasicon Type ◽  
Temperature Ranges

Na solid electrolytes are cheaper than the ones of Li and could be of interest to apply in secondary batteries and gas sensors. In the present work, the NASICON-type Na 1.3 Ti 1.7 Al 0.3( PO 4)3 compound has been synthesized by Pechini method and the phase purity of the compound was confirmed by XRD. Ceramics of the compound were prepared in several different sintering temperatures and the morphology of the samples was examined by SEM. The investigation of the electrical properties was performed in 10 Hz to 3 ⋅ 109 Hz and 300–500 K frequency and temperature ranges by means of impedance spectroscopy. The impedance spectra were analyzed and observed dispersions were related to microstructure of the ceramics.

The observation of defects on (100) CdTe surfaces by chemical etching

1992 ◽  
Vol 50 (2) ◽  
pp. 1424-1425
Author(s):  
M.E. Lee
Keyword(s):  
Single Crystal ◽  
Grain Boundaries ◽  
Single Crystals ◽  
Chemical Etching ◽  
Crystalline Perfection ◽  
Crystalline Defects ◽  
High Incidence ◽  
Crystallographic Defects ◽  
Cdznte Substrates ◽  
Device Technology

The crystalline perfection of bulk CdTe substrates plays an important role in their use in infrared device technology. The application of chemical etchants to determine crystal polarity or the density and distribution of crystallographic defects in (100) CdTe is not well understood. The lack of data on (100) CdTe surfaces is a result of the apparent difficulty in growing (100) CdTe single crystal substrates which is caused by a high incidence of twinning. Many etchants have been reported to predict polarity on one or both (111) CdTe planes but are considered to be unsuitable as defect etchants. An etchant reported recently has been considered to be a true defect etchant for CdTe, MCT and CdZnTe substrates. This etchant has been reported to reveal crystalline defects such as dislocations, grain boundaries and inclusions in (110) and (111) CdTe. In this study the effect of this new etchant on (100) CdTe surfaces is investigated.The single crystals used in this study were (100) CdTe as-cut slices (1mm thickness) from Bridgman-grown ingots.

scholarly journals Internal melt figures in ice by rapid adiabatic compression

1994 ◽  
Vol 40 (134) ◽  
pp. 132-134
Author(s):  
R.E. Gagnon ◽  
C. Tulk ◽  
H. Kiefte
Keyword(s):  
Phase Transformations ◽  
Grain Boundaries ◽  
Single Crystals ◽  
Adiabatic Compression ◽  
Air Bubbles ◽  
Water Ice ◽  
Deep Focus ◽  
And Behavior ◽  
First Time

AbstractSingle crystals and bicrystals of water ice have been adiabatically pressurized to produce, and clearly illustrate, two types of internal melt figures: (1) dendritic figures that grow from nucleation imperfections on the specimen’s surface, or from air bubbles at grain boundaries, into the ice as pressure is elevated; and (2) compression melt fractures, flat liquid-filled disks, that nucleate at imperfections in the crystal and grow with the application of pressure eventually to sprout dendritic fingers at the periphery. The transparency of the ice permitted visualization of the growth and behavior of the figures, and this could be an important tool in understanding the role of phase transformations in deep-focus earthquakes. Correlation between figure size and pressure is noted for the first time.

Impedance Spectroscopy for Metal Halide Perovskite Single Crystals: Recent Advances, Challenges, and Solutions

2021 ◽  
Vol 6 (9) ◽  
pp. 3275-3286
Author(s):  
Mohammad Adil Afroz ◽  
Clara A. Aranda ◽  
Naveen Kumar Tailor ◽  
Yukta ◽  
Pankaj Yadav ◽  
...  
Keyword(s):  
Impedance Spectroscopy ◽  
Single Crystals ◽  
Metal Halide ◽  
Recent Advances ◽  
Metal Halide Perovskite ◽  
Halide Perovskite

Study on Low Temperature Conduction Mechanism of Al Doped ZnO/SiO2/ P-Si Heterojunction

2021 ◽  
Vol 904 ◽  
pp. 363-368
Author(s):  
Xiao Yan Zhou ◽  
Bang Sheng Yin
Keyword(s):  
Activation Energy ◽  
Impedance Spectroscopy ◽  
Low Temperature ◽  
Grain Boundaries ◽  
Ac Conductivity ◽  
Spray Pyrolysis Method ◽  
Temperature Conductivity ◽  
Calculated Activation Energy ◽  
Doped Zno ◽  
Temperature Conduction

The 3 at% Al doped ZnO thin films were deposited on p-Si substrate with a native SiO2 layer by spray pyrolysis method. Low temperature conduction behaviors were studied by analysis of impedance spectroscopy and low temperature ac conductivity. The results of impedance spectroscopy showed that the grain boundaries contributed to the resistivity of Al doped ZnO/SiO2/p-Si heterojunction. The calculated activation energy was 0.073 eV for grain boundaries. The equivalent circuit to demonstrate the electrical properties of Al doped ZnO/SiO2/p-Si heterojunction was a series connection of two parallel combination circuits of a resistor and a universal capacitor. Low temperature ac conductivity measurements indicated that the conductivity increased with temperature. Low temperature conductivity mechanism was electron conductivity, and the activation energy was 0.086 eV.

scholarly journals Relaxation type Kinetic equation for electrons in polycrystalline metal

2021 ◽  
Vol 2056 (1) ◽  
pp. 012021
Author(s):  
T N Lam ◽  
F Karimov ◽  
A A Yushkanov
Keyword(s):  
Kinetic Equation ◽  
Electrical Properties ◽  
Grain Boundaries ◽  
Electron Scattering ◽  
Bulk Conductivity ◽  
Polycrystalline Metal ◽  
Conduction Electrons

Abstract The kinetic equation for electrons in a polycrystalline metal is considered. A kinetic equation is written that describes in a unified manner the scattering of conduction electrons both by impurities or phonons and by grain boundaries. This kinetic equation takes into account the scattering of electrons at the boundaries of crystallites of a polycrystalline metal An expression is obtained for the bulk conductivity in the general case. Let us analyze the effect of electron scattering at grain boundaries on its electrical properties.

Effect of zirconia content on electrical conductivities of mullite/zirconia composites measured by impedance spectroscopy

2008 ◽  
Vol 23 (8) ◽  
pp. 2125-2132 ◽  
Author(s):  
Hong-Da Ko ◽  
Chien-Cheng Lin ◽  
Kuo-Chuang Chiu
Keyword(s):  
Impedance Spectroscopy ◽  
Grain Boundaries ◽  
Electrical Conduction ◽  
Activation Energies ◽  
Impedance Spectra ◽  
Ac Impedance Spectroscopy ◽  
Electrical Conductivities ◽  
Zirconia Composites ◽  
Monolithic Zirconia ◽  
Zirconia Content

Electrical conductivities of various mullite/zirconia composites, as well as monolithic mullite and zirconia, were measured using AC impedance spectroscopy from 100 Hz to 10 MHz at temperatures ranging from 150 to 1300 °C. The impedance spectra of monolithic zirconia and mullite/zirconia composites showed two semicircles because of the contributions from grains and grain boundaries, while those of monolithic mullite had one semicircle due to the predominant contribution from grains. This indicates that the conductivities of the mullite/zirconia composites increased with zirconia content. The activation energies of electrical conduction in mullite and zirconia were about 65 and 79 kJ/mol, respectively, and those of mullite/zirconia composites were between 65 and 79 kJ/mol. While the conductivities of various composites at 1 MHz were fitted by Lichtenecker’s rule, the general mixing equation could be applied to the conductivities measured at 1 kHz.

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