DETERMINATION OF DIELECTRIC PROPERTIES UNDER CONSTANT VOLUME CONDITIONS (PART 1). ON THE ANALYSIS OF DIELECTRIC RELAXATION MEASUREMENTS (PART 2). DIELECTRIC CONSTANTS OF LIQUID AND SOLID HYDROGEN SULFIDE (PART 3)

1954 ◽  
Author(s):  
ANDREW GILCHRIST ◽  
ROBERT H. COLE ◽  
STEPHEN HAVRILIAK ◽  
RICHARD W. SWENSON
Keyword(s):  
Hydrogen Sulfide ◽  
Dielectric Properties ◽  
Dielectric Relaxation ◽  
Solid Hydrogen ◽  
Constant Volume ◽  
Dielectric Constants ◽  
Relaxation Measurements

scholarly journals An Empirical Relation for the Evaluation of the Dielectric Relaxation Time of Certain Polar Liquids Using a Single Microwave Frequency

1974 ◽  
Vol 27 (1) ◽  
pp. 87 ◽  
Author(s):  
BS Sarma ◽  
V Venkateswara Rao
Keyword(s):  
Experimental Data ◽  
Relaxation Time ◽  
Dielectric Relaxation ◽  
Concentration Factor ◽  
Empirical Relation ◽  
Microwave Frequency ◽  
Dielectric Constants ◽  
Dielectric Relaxation Time ◽  
Polar Liquids

An empirical relation is proposed for the determination of the dielectric relaxation time .. of polar liquids with nearly spherical molecules from measurements of the dielectric constants at a single microwave frequency. The relation is obtained by introducing a concentration factor as a parameter in the expression for .. derived by Eyring et al. (1941). Its validity for suitable polar liquids is demonstrated by comparison of results with previously reported values. Thermodynamic parameters for a number of liquids at various concentrations have also been evaluated from experimental data using the relation.

Dielectric Constants of Liquid and Solid Hydrogen Sulfide

1955 ◽  
Vol 23 (1) ◽  
pp. 134-135 ◽  
Author(s):  
S. Havriliak ◽  
R. W. Swenson ◽  
R. H. Cole
Keyword(s):  
Hydrogen Sulfide ◽  
Solid Hydrogen ◽  
Dielectric Constants

Phase Diagram of the Ferroelectric Perovskite (Na0.5Bi0.5)1−xBaxTiO3 by Anelastic and Dielectric Relaxation Measurements

2012 ◽  
Vol 184 ◽  
pp. 339-344 ◽  
Author(s):  
Francesco Trequattrini ◽  
Francesco Cordero ◽  
Floriana Craciun ◽  
Elisa Mercadelli ◽  
Carmen Galassi
Keyword(s):  
Phase Diagram ◽  
Dielectric Relaxation ◽  
Phase Boundary ◽  
Monoclinic Phase ◽  
Structural Disorder ◽  
Extensive Study ◽  
Elastic Compliance ◽  
Relaxation Measurements ◽  
Ferroelectric Perovskite

Anelastic and dielectric relaxation measurements have been carried out on poled and unpoled samples of the ferroelectric perovskite (Na0.5Bi0.5)1−xBaxTiO3(NBT-xBT), with composition in the range between pure NBT and the morphotropic phase boundary, 0 ≤x≤ 0.08. The complex elastic compliance spectra contain clear indications of both the rhombohedral/tetragonal and tetragonal/cubic transitions, allowing the determination of the phase diagram, which is difficult to obtain by diffraction techniques due to the very low distortions in both the tetragonal and rhombohedral phases and to the structural disorder in the Na/Bi sublattice. An extensive study is made for concentrations in the region of the morphotropic boundary (x∼ 0.06) in order to find possible signatures of monoclinic phase, as for the case of PbZr1-xTixO3(PZT). The main features in the anelastic curves are compared with those in the dielectric spectra and are tentatively related to different modes of octahedral rotations and polar cation shifts.

scholarly journals Physical aspects of 0-3 dielectric composites

2015 ◽  
Vol 05 (02) ◽  
pp. 1550012 ◽  
Author(s):  
Lin Zhang ◽  
Patrick Bass ◽  
Z.-Y. Cheng
Keyword(s):  
Dielectric Properties ◽  
High Performance ◽  
Critical Role ◽  
Practical Importance ◽  
Dielectric Constants ◽  
Challenging Problem ◽  
New Developments ◽  
High Dielectric ◽  
Made In

0-3 dielectric composites with high dielectric constants have received great interest for various technological applications. Great achievements have been made in the development of high performance of 0-3 composites, which can be classified into dielectric–dielectric (DDCs) and conductor–dielectric composites (CDCs). However, predicting the dielectric properties of a composite is still a challenging problem of both theoretical and practical importance. Here, the physical aspects of 0-3 dielectric composites are reviewed. The limitation of current understanding and new developments in the physics of dielectric properties for dielectric composites are discussed. It is indicated that the current models cannot explain well the physical aspects for the dielectric properties of 0-3 dielectric composites. For the CDCs, experimental results show that there is a need to find new equations/models to predict the percolative behavior incorporating more parameters to describe the behavior of these materials. For the DDCs, it is indicated that the dielectric loss of each constituent has to be considered, and that it plays a critical role in the determination of the dielectric response of these types of composites. The differences in the loss of the constituents can result in a higher dielectric constant than both of the constituents combined, which breaks the Wiener limits.

Fluorescence chemosensors for hydrogen sulfide detection in biological systems

The Analyst ◽  
2015 ◽  
Vol 140 (6) ◽  
pp. 1772-1786 ◽  
Author(s):  
Zhi Guo ◽  
Guiqiu Chen ◽  
Guangming Zeng ◽  
Zhongwu Li ◽  
Anwei Chen ◽  
...  
Keyword(s):  
Hydrogen Sulfide ◽  
Biological Systems ◽  
Sulfate Reducing Bacteria ◽  
Fluorescence Sensing ◽  
Sulfate Reducing ◽  
Potential Applications ◽  
Reducing Bacteria

The development of H2S fluorescence-sensing strategies and their potential applications in the determination of sulfate-reducing bacteria activity.

scholarly journals Dielectric Properties of Wood-Polymer Composites: Effects of Frequency, Fiber Nature, Proportion, and Chemical Composition

2021 ◽  
Vol 5 (6) ◽  
pp. 141
Author(s):  
Imen Elloumi ◽  
Ahmed Koubaa ◽  
Wassim Kharrat ◽  
Chedly Bradai ◽  
Ahmed Elloumi
Keyword(s):  
Dielectric Properties ◽  
Polymer Composites ◽  
Wide Frequency Range ◽  
Dielectric Constants ◽  
Cellulose Content ◽  
Wood Fibers ◽  
Low Frequencies ◽  
Wood Polymer ◽  
Wood Polymer Composites ◽  
New Applications

The characterization of the dielectric properties of wood–polymer composites (WPCs) is essential to understand their interaction with electromagnetic fields and evaluate their potential use for new applications. Thus, dielectric spectroscopy monitored the evolution of the dielectric properties of WPCs over a wide frequency range of 1 MHz to 1 GHz. WPCs were prepared using mixtures of different proportions (40%, 50%, and 60%) of wood and bark fibers from various species, high-density polyethylene, and maleated polyethylene (3%) by a two-step process, extrusion and compression molding. Results indicated that wood fibers modify the resistivity of polyethylene at low frequencies but have no effect at microwave frequencies. Increasing the fiber content increases the composites’ dielectric properties. The fibers’ cellulose content explains the variation in the dielectric properties of composites reinforced with fibers from different wood species. Indeed, composites with high cellulose content show higher dielectric constants.

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