scholarly journals Microwave dielectric permittivity and photoluminescence of Eu2O3 doped laser heated pedestal growth Ta2O5 fibers

2008 ◽  
Vol 92 (25) ◽  
pp. 252904 ◽  
Author(s):  
C. P. L. Rubinger ◽  
L. C. Costa ◽  
M. Macatrão ◽  
M. Peres ◽  
T. Monteiro ◽  
...  
Keyword(s):  
Dielectric Permittivity ◽  
Microwave Dielectric ◽  
Laser Heated

HIGH THERMAL STABILITY OF MICROWAVE DIELECTRIC PROPERTIES OF CaTi1-x(Nb1/2Fe1/2)xO3 CERAMICS

2011 ◽  
Vol 01 (04) ◽  
pp. 417-427 ◽  
Author(s):  
A. D. S. BRUNO COSTA ◽  
M. C. ROMEU ◽  
R. C. S. COSTA ◽  
T. S. M. FERNANDES ◽  
F. W. DE O. AMARANTE ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Dielectric Permittivity ◽  
Solid Solutions ◽  
Microwave Dielectric Properties ◽  
Titanium Content ◽  
Milling Process ◽  
Solid State Method ◽  
Small Shift ◽  
X Ray ◽  
Microwave Dielectric

This paper presents a study of the structure and microwave properties of [Formula: see text] substituted into the Ti 4+ site of calcium titanate ceramics. The structural and dielectric properties of solid solutions in CaTi 1-x( Nb 1/2 Fe 1/2)x O 3, was done. The microwave dielectric properties of solid solutions in CaTi 1-x( Nb 1/2 Fe 1/2)x O 3, (CNFTOX with x = 0.1 to x = 1) is discussed. The modified CaTiO3 (CTO) ceramics were prepared by a new procedure in the solid-state method. A study of the variations of the ball-milling process was done. The calcinations were done at 900°C for 3 and 5 h respectively, and the sintering at 1100°C, for 3 h. The structural property studies of the ceramics were investigated by X-ray diffraction (XRD) and Raman spectroscopy. The X-ray analysis showed that all samples have an orthorhombic structure. The refinement analysis of all samples were also duly performed and discussed. The nine scattering bands centered at 183, 227, 247, 288, 338, 470, 490 and 805 cm-1 were observed. Several peaks presented a small shift as a function of the x value. All Raman spectra in the studied samples showed a small band at 805 cm-1, which is a function of the x value. The dielectric permittivity and loss at microwave frequencies (MW) were investigated. For both calcination treatments (900°C for 3 and 5 h), the dielectric permittivity decreased with a decrease of the titanium content. Dielectric permittivity values in the range of 20 to 80 were obtained. It was also observed that a higher number of balls in the milling process contribute to the increase of the εr values. The CNFTO has an excellent microwave property at x = 0.6, with a temperature coefficient of resonant frequency (τf) near zero (τf = 2.8 ppm/°C).

Microwave dielectric permittivity and relaxation for aqueous potassium trifluoroacetate solutions

2013 ◽  
Vol 58 (7) ◽  
pp. 880-885 ◽  
Author(s):  
A. K. Lyashchenko ◽  
I. V. Balakaeva ◽  
L. M. Timofeeva ◽  
A. S. Lileev
Keyword(s):  
Dielectric Permittivity ◽  
Microwave Dielectric

A study of the microwave dielectric permittivity of liquid crystals in electric and magnetic fields

1998 ◽  
Vol 43 (1) ◽  
pp. 105-109 ◽  
Author(s):  
B. A. Belyaev ◽  
N. A. Drokin ◽  
V. F. Shabanov ◽  
V. N. Shepov
Keyword(s):  
Liquid Crystals ◽  
Dielectric Permittivity ◽  
Magnetic Fields ◽  
Microwave Dielectric ◽  
Electric And Magnetic Fields

scholarly journals Microwave Interferometry Based On Open-ended Coaxial Technique for High Sensitivity Liquid Sensing

2017 ◽  
Vol 6 (3) ◽  
pp. 88 ◽  
Author(s):  
H. Bakli ◽  
K. Haddadi
Keyword(s):  
Sodium Chloride ◽  
Dielectric Permittivity ◽  
High Sensitivity ◽  
Calibration Model ◽  
Liquid Media ◽  
Dielectric Characterization ◽  
Sodium Chloride Solutions ◽  
Microwave Dielectric ◽  
Local Properties ◽  
Liquid Sensing

This paper describes a modified open-ended coaxial technique for microwave dielectric characterization in liquid media. A calibration model is developed to relate the measured transmission coefficient to the local properties of the sample under test. As a demonstration, the permittivity of different sodium chloride solutions is experimentally determined. Accuracies of 0.17% and 0.19% are obtained respectively for the real and imaginary parts of dielectric permittivity at 5.9 GHz.

Microwave dielectric permittivity and relaxation of aqueous potassium trimethylacetate solutions

2013 ◽  
Vol 58 (10) ◽  
pp. 1254-1258 ◽  
Author(s):  
A. K. Lyashchenko ◽  
I. V. Balakaeva ◽  
D. V. Loginova ◽  
A. S. Lileev
Keyword(s):  
Dielectric Permittivity ◽  
Microwave Dielectric

Microwave Dielectric Relaxation in Binary Mixtures of Pyridine and 1-Propanol at Different Temperatures

2013 ◽  
Vol 209 ◽  
pp. 86-89
Author(s):  
Chintan M. Trivedi ◽  
Vipinchandra A. Rana ◽  
Hemantkumar A. Chaube
Keyword(s):  
Dielectric Permittivity ◽  
Binary Mixtures ◽  
Optical Frequency ◽  
Microwave Frequencies ◽  
Microwave Dielectric ◽  
Liquid Samples ◽  
Static Dielectric Permittivity ◽  
X Band ◽  
Different Temperatures ◽  
Lcr Meter

Dielectric constant (ε′) and Dielectric loss (ε″) of the binary mixtures of the pyridine and 1-propanol have been measured at microwave frequencies of X-band and J-band at 303,313 and 323K temperatures. Static dielectric permittivity (ε0) of the liquid samples has been determined using precision LCR meter. Dielectric permittivity at optical frequency (ε∞) has also been measured. Determined values of Static dielectric permittivity (ε0) and complex permittivity (ε*) at 9.1 GHz frequency were used to evaluate relaxation time (τ). Determined parameters have been interpreted in terms of molecular interaction among the molecular species of the binary mixtures.

scholarly journals DIELECTRIC RF RESONATORS WITH OPEN BOUNDARIES FOR STUDYING RADIATION EFFECT ON ELECTRODYNAMIC CHARACTERISTICS OF SOLID DIELECTRICS

2020 ◽  
pp. 39-44
Author(s):  
V.A. Kushnir ◽  
K.Yu. Kramarenko ◽  
V.V. Mytrochenko ◽  
O.D. Nikitina ◽  
S.A. Perezhogin ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Dielectric Permittivity ◽  
Radiation Effect ◽  
Charged Particles ◽  
Dielectric Materials ◽  
Dielectric Resonators ◽  
Open Boundaries ◽  
Microwave Dielectric ◽  
Accuracy Of Measurements ◽  
Solid Dielectrics

The use of dielectric materials in the charged particles accelerators requires investigation of changes in the electrodynamic properties of these materials under the influence of ionizing radiation. First of all it is necessary to study the effect of radiation on the complex dielectric permittivity (ꜫ and tgδ) of these materials. The actual task is to measure very small relative changes in the dielectric constant, for example, ∆ꜫ/ꜫ~10-4. Such accuracy can be provided by resonator methods. In the present work results of theoretical and experimental research of microwave dielectric resonators with open boundaries are given. It is shown, that they can be used to measure dielectrics during irradiation by gamma radiation or charged particles beam. The analysis of factors that affect the accuracy of measurements is carried out.

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