Alteration of the stacked 2π/3 magnetic structure in the triangular lattice anti-ferromagnet LiCrS2

2001 ◽  
Vol 79 (11-12) ◽  
pp. 1427-1432
Author(s):  
A Lafond ◽  
W Henggeler ◽  
H Mutka ◽  
B Ouladdiaf
Keyword(s):  
Transition Temperature ◽  
Critical Temperature ◽  
Solid State ◽  
Elastic Scattering ◽  
Temperature Dependence ◽  
Triangular Lattice ◽  
Magnetic Ordering ◽  
Magnetic Scattering ◽  
Powder Samples ◽  
Anisotropic Interactions

LiCrS2 has magnetic Cr ions with spin S = 3/2 on a triangular lattice. Other researchers (J. Solid State Chem. 3, 590, 1971) concluded that this compound has an anti-ferromagnetic order with a stacked 2π/3 structure below a transition temperature of the order of TN = 50 K. We have re-examined this system with neutron scattering methods on powder samples, paying attention to the temperature dependence of the magnetic scattering. The overall characteristics of the magnetic ordering are in agreement with the earlier study but we have observed significant modifications of the stacked 2π/3 structure well below the critical temperature. The main new features observed on cooling from T = 25 K down to T = 1.5 K are (i) the gradual decrease from 2.5 µB to 2.3 µB of the ordered moment attributed to the 2π/3 structure, (ii) the appearance of new correlations corresponding to a multiplication of the magnetic unit cell, and (iii) the growth of a diffuse elastic scattering component that can be ascribed to a frozen disorder. These observation are not explained in the framework of the standard theoretical treatments concerning the stacked triangular anti-ferromagnet with Heisenberg or slightly anisotropic interactions. PACS Nos.: 75.10Nr, 75.25+z, 75.40Gb

Fabrication and study the effect of the laser on the properties of the compound Tl2-xHgxBa2-ySryCa2Cu3O10+δ superconductor

2018 ◽  
pp. 168
Author(s):  
A. Kareem Dahash Ali ◽  
Nihad Ali Shafeek
Keyword(s):  
Transition Temperature ◽  
Solid State ◽  
Hydrostatic Pressure ◽  
Electrical Properties ◽  
Co2 Laser ◽  
Temperature Shift ◽  
Unit Cell ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structural And Electrical Properties

This study included the fabrication of    compound (Tl2-xHgxBa2-ySryCa2Cu3O10+δ) in a manner solid state and under hydrostatic pressure ( 8 ton/cm2) and temperature annealing(850°C), and determine the effect of the laser on the structural and electrical properties elements in the compound, and various concentrations of x where (x= 0.1,0.2,0.3 ). Observed by testing the XRD The best ratio of compensation for x is 0.2 as the value of a = b = 5.3899 (A °), c = 36.21 (A °) show that the installation of four-wheel-based type and that the best temperature shift is TC= 142 K  .When you shine a CO2 laser on the models in order to recognize the effect of the laser on these models showed the study of X-ray diffraction of these samples when preparing models with different concentrations of the values ​​of x, the best ratio of compensation is 0.2 which showed an increase in the values ​​of the dimensions of the unit cell a=b = 5.3929 (A °), c = 36.238 (A°). And the best transition temperature after shedding laser is TC=144 K. 

Temperature Dependence of Lithium Anode Voiding in Argyrodite Solid-State Batteries

2021 ◽  
Author(s):  
Dominic Spencer Jolly ◽  
Ziyang Ning ◽  
Gareth O. Hartley ◽  
Boyang Liu ◽  
Dominic L. R. Melvin ◽  
...  
Keyword(s):  
Solid State ◽  
Temperature Dependence ◽  
Lithium Anode ◽  
Solid State Batteries

scholarly journals The Intramolecular Pressure and the Extension of the Critical Point’s Influence Zone on the Order Parameter

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Jose Luis Rivera ◽  
Homero Nicanor-Guzman ◽  
Roberto Guerra-Gonzalez
Keyword(s):  
Transition Temperature ◽  
Critical Temperature ◽  
Liquid Phase ◽  
Order Parameter ◽  
Bulk Liquid ◽  
Influence Zone ◽  
Molecular Potential ◽  
Liquid Phases ◽  
Dynamics Simulations ◽  
Wide Zone

The critical point affects the coexistence behavior of the vapor-liquid equilibrium densities. The length of the critical influence zone is under debate because for some properties, like shear viscosity, the extension is only a few degrees, while for others, such as the density order parameter, the critical influence zone covers up to hundreds of degrees below the critical temperature. Here we show that, for ethane, the experimental critical influence zone covers a wide zone of tens of degrees (below the critical temperature) down to a transition temperature, at which the apparent critical influence zone vanishes, and the transition temperature can be predicted through a pressure analysis of the coexisting bulk liquid phase, using a simple molecular potential. The liquid phases within the apparent critical influence zone show low densities, making them behave internally like their corresponding vapor phases. Therefore, Molecular Dynamics simulations reveal that the experimentally observed wide extension of the critical influence zone is the result of a vapor-like effect due to low bulk liquid phase densities.

scholarly journals Quasi-synchronous thermocompensation for ISFET-based ionometric devices. Part 1: Theory and simulation

2021 ◽  
pp. 36-44
Author(s):  
O. S. Pavluchenko ◽  
О. L. Kukla
Keyword(s):  
Solid State ◽  
Temperature Dependence ◽  
Field Effect Transistors ◽  
Circuit Simulation ◽  
Intrinsic Noise ◽  
Liquid Electrolyte ◽  
Practical Implementation ◽  
Transducer Output ◽  
In Vivo Analysis

Solid-state ion selective transducers, as an alternative to the traditional liquid electrolyte-filled glass electrodes, are known for over four decades now, and find their use in various areas of industry and applied science, such as in vivo analysis of the ions activity in biological and medical research, monitoring of toxic and aggressive environments, and biosensors design. However, along with potential advantages — short response time, small size, chemical inertness and durability — solid-state devices also possess certain inherent drawbacks — namely intrinsic noise, drift and instability of sensing properties, and cross-sensitivity to various interfering environmental conditions — that inhibit their widespread acceptance. Further improvement of the fabrication technology and methodology of application of these devices is thus still an important practical task even today. This paper is a first part of the two-part work dedicated to the problem of compensating the temperature dependence of a solid-state ion selective transducer output. Specifically, presented work considers the possibility of using ion-selective field-effect transistors (ISFET) that serve as primary transducers in an ionometric device, as temperature sensors. This allows compensating the temperature dependence of ionometric signal without substantial complication of the ionometer structure, and eliminates the need to include a separate thermometric channel as part of the instrument. Ionometric and thermometric channels are combined into a unified measuring path, with the sensor functions separated in time. The ISFET operation modes are switched by changing polarity of the bias voltage, and thus direction of the current flowing through the sensor. The authors propose a corresponding secondary transducer structure and simplified schematic illustrating the implementation of its key components. The concept’s applicability is supported by the circuit simulation results. Some aspects of the practical implementation of the proposed concept will be presented further in the upcoming second part of the paper.

Temperature dependence of resonant x-ray magnetic scattering in holmium

1994 ◽  
Vol 50 (5) ◽  
pp. 2990-3004 ◽  
Author(s):  
G. Helgesen ◽  
J. P. Hill ◽  
T. R. Thurston ◽  
Doon Gibbs ◽  
J. Kwo ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Magnetic Scattering ◽  
X Ray

Few-Parameter Equation of State of the Shock Adiabat with Allowance for Melting

2008 ◽  
Vol 3 (4) ◽  
pp. 52-63
Author(s):  
Evgeny I. Kraus
Keyword(s):  
Solid State ◽  
Equation Of State ◽  
Temperature Dependence ◽  
Thermodynamic Functions ◽  
Melting Curve ◽  
Shock Adiabat ◽  
Elastic Component ◽  
Configuration Entropy ◽  
Model Equations ◽  
State Body

The model equations for thermodynamic functions of liquid status based on volume and temperature dependence of Gruneisen coefficient are offered. Thermal components are described by the Debye’s model. Despite the perfect analogy to solid-state body the distinction in an elastic component of energy and pressures is taken into consideration when deriving the equations. The configuration entropy is embedded into thermodynamic functions of liquid. It describes a disorderliness measure of liquid and results in the final values of the entropy when temperature formally amounts to zero. The melting curve as the boundary between phases is constructed.

Spekktroskopische Untersuchungen in der Festkörperchemie, IX / Spectroscopic Investigations in the Solid-State Chemistry, IX

1975 ◽  
Vol 30 (3-4) ◽  
pp. 198-201 ◽  
Author(s):  
Paul K. Burkert ◽  
Frank Hutter ◽  
Detlev Koth
Keyword(s):  
Solid State ◽  
Temperature Dependence ◽  
Temperature Coefficient ◽  
Asymmetry Parameter ◽  
Lattice Parameters ◽  
Coupling Constants ◽  
Solid State Chemistry ◽  
Spectroscopic Investigations ◽  
Experimental Correlation ◽  
The Absolute

The four 185Re, 187Re—NQR-transitions of RbReO4 were measured. From the NQR-coupling constants, asymmetry-parameter and normal temperature-coefficient in the range of 77-300°K one can conclude, that the anomalons temperature dependence of the NQR-frequencies of NH4ReO4 is not caused by the absolute values of certain lattice parameters.An experimental correlation of the Re—NQR-coupling constants of scheelite-structured perrhenates with the length of the elementar cell was found and discussed.

scholarly journals Modelling the enthalpy change and transition temperature dependence of the metal–insulator transition in pure and doped vanadium dioxide

2020 ◽  
Vol 22 (24) ◽  
pp. 13474-13478
Author(s):  
Haichang Lu ◽  
Stewart Clark ◽  
Yuzheng Guo ◽  
John Robertson
Keyword(s):  
Transition Temperature ◽  
Temperature Dependence ◽  
Spin Density ◽  
Latent Heat ◽  
Vanadium Dioxide ◽  
Enthalpy Change ◽  
Formula Unit ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
Enthalpy Difference

We show that a non-collinear spin density GGA+U functional calculation can describe the enthalpy difference (latent heat) of ΔE0 = −44.2 meV per formula unit, similar to the experimental value, between the paramagnetic rutile and the M1 phases of VO2.

Anomalous Temperature Dependence of Solvent-Enhanced Dye Diffusion In Polymer Films

2002 ◽  
Vol 725 ◽  
Author(s):  
T. Graves-Abe ◽  
F. Pschenitzka ◽  
J.C. Sturm
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Temperature Dependence ◽  
Polymer Film ◽  
Light Emitting Diode ◽  
Solvent Vapor ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Thermally Driven

AbstractOne promising method to pattern full color polymer Organic Light-Emitting Diode (OLED) displays is to print dye from a pre-patterned organic film onto a spin-cast polymer and then diffuse the dye into the film at room temperature in a solvent vapor environment. This method utilizes the well-known tendency for a polymer film to absorb solvent vapor, which depresses the glass transition temperature of the polymer and dramatically increases diffusion the dye. In this work, we have studied the temperature dependence of this process. The dye coumarin 6 (C6) was transferred onto films consisting of 2-(4-biphenylyl)-5-(4-tert-butylphenyl)- 1,3,4-oxadiazole (PBD) mixed with the polymer poly(9-vinylcarbazole) (PVK). Samples were then placed on a heated stage in a chamber and exposed to acetone vapor to diffuse the C6 into the polymer film. The profile of the diffused dye was determined by depthdependent photoluminescence measurements and Secondary Ion Mass Spectroscopy. We observed that the amount of diffused dye decreased at higher temperatures, in contrast to conventional thermally-driven diffusion. The results are understood by noting that the decrease in the polymer glass-transition temperature and the corresponding rapid increase in dye diffusivity depend on the quantity of solvent absorbed by the polymer, which decreases as the temperature of the polymer is raised.

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