The reaction of trimethylamine in liquid hydrogen sulphide: an electrical conductivity study

1983 ◽  
Vol 61 (6) ◽  
pp. 1142-1145 ◽  
Author(s):  
James D. Halliday ◽  
Patrick E. Bindner
Keyword(s):  
Electrical Conductivity ◽  
Dielectric Constant ◽  
Hydrogen Sulphide ◽  
Liquid Hydrogen ◽  
Weak Electrolyte ◽  
Temperature Range ◽  
Conductance Data ◽  
Brønsted Base ◽  
Electrical Conductivity Study ◽  
Hydrogen Bonded

The electrical conductivity of trimethylamine solutions (2.26 × 10−4 to 2.89 × 10−1 mol L−1) in liquid hydrogen sulphide over the temperature range −72.5 °C to +25.0 °C has been measured. The data indicate that the trimethylamine behaves as a Brønsted base in liquid hydrogen sulphide [1] and is protonated to form trimethylammonium hydrogensulphide. The latter[Formula: see text]behaves as a normal weak electrolyte in a solvent of low to medium dielectric constant [Formula: see text]. The conductance data as a function of temperature also show that trimethylamine exists both as a hydrogen bonded complex with H2S and as an unassociated molecule in liquid H2S.

scholarly journals Magnetic and Electrical Transport Properties of Vanadium Telluride

1980 ◽  
Vol 35 (7) ◽  
pp. 701-703 ◽  
Author(s):  
C. Prasad ◽  
R. A. Singh
Keyword(s):  
Electrical Conductivity ◽  
Dielectric Constant ◽  
Magnetic Susceptibility ◽  
Electrical Transport ◽  
Powdered Sample ◽  
Neel Temperature ◽  
Electrical Transport Properties ◽  
Néel Temperature ◽  
Paramagnetic Curie Temperature ◽  
Temperature Range

Measurements of the magnetic susceptibility of a powdered sample of VTe in the temperature range 90 - 700 K, and of the a.c. electrical conductivity (σ), thermoelectric power (θ) and dielectric constant (ε′) of pressed pellets of the compound in the temperature range 300 -1100 K are reported. The compound is found to be antiferromagnetic with Neel temperature 420 ± 5 K. The effective paramagnetic moment and paramagnetic Curie temperature are found to be 1.6 μB and - 250 K, respectively. The dependence of σ, θ and ε′ on temperature shows no anomaly at the Neel temperature and is indicative of the metallic nature of the compound.

Comparative Study on Electrical and Dielectric Properties of Sintered Nano and Micro Silicon Nitride Ceramics

2016 ◽  
Vol 2 (1) ◽  
pp. 13-18
Author(s):  
Imran Khan ◽  
M S A Khan
Keyword(s):  
Electrical Conductivity ◽  
Dielectric Constant ◽  
Grain Size ◽  
Dielectric Properties ◽  
Silicon Nitride ◽  
Dc Conductivity ◽  
Temperature Range ◽  
Nitride Ceramics ◽  
Electrical And Dielectric Properties ◽  
Sintered Silicon

In the present work we have studied the electrical conductivity, dielectric constant and dielectric loss of Sintered Silicon Nitride ceramics. In this study it was found that the grain size has great impact on electrical conductivity and dielectric properties of Sintered Silicon Nitride Ceramics. The result shows more efficiency of electrical and dielectric properties with nano sized grains.  The sintering was performed in a programmable furnace at 950 K. The dc conductivity measured in the temperature range 300 K to 900 K. At higher temperature (T > 800 K), the dc conductivity increases exponentially with temperature for both of the investigated samples. Dielectric constant and loss are measured in the temperature range 300 K to 900 K with frequency range 1 KHz to 1 MHz. To confirm the grain size, the samples are characterized by the Scanning Electron Microscope (SEM). These types of samples can be used as a high temperature semi-conducting materials.

The dissociation constant for potassium methylamide ion pairs in methylamine

1978 ◽  
Vol 56 (11) ◽  
pp. 1518-1523
Author(s):  
E. Allan Symons ◽  
J. Douglas Bonnett
Keyword(s):  
Dielectric Constant ◽  
Dissociation Constant ◽  
Lower Limit ◽  
Ion Pairs ◽  
Ion Pair ◽  
Solvent Viscosity ◽  
Temperature Range ◽  
Conductance Data ◽  
Heat Of Dissociation ◽  
Good Agreement

The limiting equivalent conductance (Λ0) and ion pair dissociation constant (Kd) have been obtained for potassium methylamide in methylamine from conductance data measured over the temperature range −55 to + 25° C. The value of Kd increases from 6.3 × 10−8 mol L−1 at the highest temperature to 9.4 × 10−7 mol L−1 at the lower limit. The results show good agreement with literature data for potassium amide in ammonia after corrections for differences in solvent viscosity and dielectric constant. The heat of dissociation is −26 kJ mol−1 above −15 °C, but decreases gradually at progressively lower temperatures as a shift occurs from tight to loose ion pair structures.

scholarly journals Preparation and Thermoelectric Properties of Graphite/poly(3,4-ethyenedioxythiophene) Nanocomposites

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2849 ◽  
Author(s):  
Yong Du ◽  
Haixia Li ◽  
Xuechen Jia ◽  
Yunchen Dou ◽  
Jiayue Xu ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Seebeck Coefficient ◽  
Thermoelectric Properties ◽  
Power Factor ◽  
Oxidative Polymerization ◽  
Polymerization Process ◽  
Measurement Temperature ◽  
Temperature Range ◽  
Different Content

Graphite/poly(3,4-ethyenedioxythiophene) (PEDOT) nanocomposites were prepared by an in-situ oxidative polymerization process. The electrical conductivity and Seebeck coefficient of the graphite/PEDOT nanocomposites with different content of graphite were measured in the temperature range from 300 K to 380 K. The results show that as the content of graphite increased from 0 to 37.2 wt %, the electrical conductivity of the nanocomposites increased sharply from 3.6 S/cm to 80.1 S/cm, while the Seebeck coefficient kept almost the same value (in the range between 12.0 μV/K to 15.1 μV/K) at 300 K, which lead to an increased power factor. The Seebeck coefficient of the nanocomposites increased from 300 K to 380 K, while the electrical conductivity did not substantially depend on the measurement temperature. As a result, a power factor of 3.2 μWm−1 K−2 at 380 K was obtained for the nanocomposites with 37.2 wt % graphite.

scholarly journals Особенности электрических свойств кристаллов ниобата лития, выращенных из распалава с флюсом K-=SUB=-2-=/SUB=-O

2019 ◽  
Vol 61 (7) ◽  
pp. 1270
Author(s):  
А.В. Яценко ◽  
С.В. Евдокимов ◽  
М.Н. Палатников ◽  
Н.В. Сидоров
Keyword(s):  
Electrical Conductivity ◽  
Lithium Niobate ◽  
Temperature Dependence ◽  
Proton Conductivity ◽  
Pyroelectric Coefficient ◽  
Strong Anisotropy ◽  
Temperature Range ◽  
Lithium Niobate Crystals

The temperature dependence of the electrical conductivity and the primary pyroelectric coefficient of lithium niobate crystals LiNbO3 grown from a melt with K2O flux was investigated in the range of 292–450 K . It is shown that these crystals are characterized by a strong anisotropy of electrical conductivity, and in the temperature range studied, proton conductivity dominates.

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