Effect of Alkali Ions on Electrical Conductivity and Dielectric Loss of Quartz Crystals

1983 ◽  
Author(s):  
J. Toulouse ◽  
E.R. Green ◽  
A.S. Nowick
Keyword(s):  
Electrical Conductivity ◽  
Dielectric Loss ◽  
Quartz Crystals ◽  
Alkali Ions

Dielectric Loss in Li- and Na-Swept α-Quartz and the Effect of Irradiation

1983 ◽  
Vol 24 ◽  
Author(s):  
J. Toulouse ◽  
A.S. Nowick
Keyword(s):  
Dielectric Loss ◽  
Low Temperature ◽  
Low Temperatures ◽  
Quantum Effects ◽  
Frequency Stability ◽  
Distorted Tetrahedron ◽  
High Quality ◽  
Quartz Crystals ◽  
Alkali Ions ◽  
Synthetic Crystals

ABSTRACTAlkali ions, which compensate for substitional Al3+, play an important role in the frequency stability of α-quartz crystals. In this work, low temperature dielectricloss measurements (between 2.9 and 300 K) are carried out on crystals that have been “swept” so as to introduce either Li+ or Na+. High quality synthetic crystals as well as natural crystals are employed. The well known loss peaks due to Al-Na pairs are further explored and similar peaks due to Al-Li are sought after but not found. It is concluded that the Al-Li pair is oriented along the C2 -axis of the A104 distorted tetrahedron. After irradiation, large peaks are observed at very low temperatures both in Li+- and Na+-containing crystals. These peaks, which are distorted below ∼6 K due to the onset of quantum effects, may originate in alkali centers produced when alkali ions are liberated by the irradiation.

scholarly journals Synthesis of (Poly-methyl Methacrylate-lead Oxide) Nanocomposites and Studying their A.C Electrical Properties for Piezoelectric Applications

2018 ◽  
Vol 7 (4) ◽  
pp. 547-551
Author(s):  
Dalal Hassan ◽  
Ahmed Hashim
Keyword(s):  
Electrical Conductivity ◽  
Dielectric Constant ◽  
Dielectric Loss ◽  
Methyl Methacrylate ◽  
Electrical Resistance ◽  
Lead Oxide ◽  
Piezoelectric Materials ◽  
Oxide Nanoparticles ◽  
Poly Methyl Methacrylate ◽  
Increase With Increase

Piezoelectric materials have been prepared from (poly-methyl methacrylate-lead oxide) nanocomposites for electronic applications. The lead oxide nanoparticles were added to poly-methyl methacrylate by different concentrations are (4, 8, and 12) wt%. The structural and dielectric properties of nanocomposites were studied. The results showed that the dielectric constant and dielectric loss of nanocomposites decrease with increase in frequency of applied electric field. The A.C electrical conductivity increases with increase in frequency. The dielectric constant, dielectric loss and A.C electrical conductivity of poly-methyl methacrylate increase with increase in lead oxide nanoparticles concentrations. The results of pressure sensor showed that the electrical resistance of (PMMA-PbO2) nanocomposites decreases with increase in pressure.

Electrical Conductivity of Quartz Crystals

1997 ◽  
Vol 32 (7) ◽  
pp. 879-891 ◽  
Author(s):  
I. Enculescu ◽  
B. Iliescu
Keyword(s):  
Electrical Conductivity ◽  
Quartz Crystals

Study of electrical conductivity and dielectric loss of polypyromellitimide at high pressure

1974 ◽  
Vol 16 (7) ◽  
pp. 1945-1950 ◽  
Author(s):  
Ye.B. Fainshtein ◽  
G.A. Lushcheikin ◽  
L.A. Igonin
Keyword(s):  
Electrical Conductivity ◽  
High Pressure ◽  
Dielectric Loss

Dielectric loss and electrical-conductivity studies on copper-doped NH4Cl crystals

Physica ◽  
1974 ◽  
Vol 77 (3) ◽  
pp. 543-556 ◽  
Author(s):  
Y.V.G.S. Murti ◽  
P.S. Prasad
Keyword(s):  
Electrical Conductivity ◽  
Dielectric Loss
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