scholarly journals Growth, Optical and Dielectric Studies on Pure and L-Lysine Doped KDP Crystals

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
N. Kanagathara ◽  
G. Anbalagan
Keyword(s):  
Dielectric Constant ◽  
Dielectric Loss ◽  
Single Crystals ◽  
Visible Region ◽  
Point Of View ◽  
Dielectric Study ◽  
Dielectric Studies ◽  
Slow Evaporation ◽  
Application Point ◽  
Kdp Crystals

Optically good quality single crystals of pure and L-lysine monohydrochloride-doped KDP crystals have been grown by a slow evaporation method. The grown crystals have been subjected to optical and dielectric studies. The UV-Vis spectrum shows the transmitting ability of the crystals in the entire visible region and transmittance percentage is increased for the doped KDP crystals. From the dielectric study, it is found that the dielectric constant and the dielectric loss of L-lysine-doped KDP crystals were lower than the pure KDP crystals. Hence L-lysine-doped KDP crystals are found to be more beneficial from an application point of view as compared to pure KDP crystals.

GROWTH AND CHARACTERIZATION OF BIS-THIOUREA STRONTIUM CHLORIDE SINGLE CRYSTALS

2010 ◽  
Vol 24 (08) ◽  
pp. 735-747 ◽  
Author(s):  
R. R. HAJIYANI ◽  
D. J. DAVE ◽  
C. K. CHAUHAN ◽  
P. M. VYAS ◽  
M. J. JOSHI
Keyword(s):  
Dielectric Constant ◽  
Dielectric Loss ◽  
Single Crystals ◽  
Applied Field ◽  
Dielectric Study ◽  
Solubility Curve ◽  
Strontium Chloride ◽  
Orthorhombic Crystal ◽  
Orthorhombic Crystal Structure ◽  
Aqueous Solvent

Bis-thiourea strontium chloride was synthesized and single crystals were grown by the slow solvent evaporation technique using aqueous solvent. The solubility curve was obtained and the determination of the induction period as well as the evaluation of kinetic parameters of nucleation was carried out. The powder XRD analysis suggested orthorhombic crystal structure. The FT-IR spectrum confirmed the presence of various functional groups. The thermo-gravimetry analysis was carried out and the crystals were found to be stable up to 170°C. Applying Coats and Redferm relation to the thermo-gram, the kinetic and thermodynamic parameters of dehydration were calculated. The dielectric study was carried out in the frequency range of applied field from 500 Hz to 1 MHz. The variations of dielectric constant, dielectric loss, AC resistivity and AC conductivity were studied with frequency. It was found that the dielectric constant and the dielectric loss decreased as the frequency of applied field increased, whereas the AC resistivity increased as the frequency increased.

scholarly journals Spectral, HR-XRD, Thermal and Dielectric Studies on Mixed Solvent Grown DAST Single Crystals

2019 ◽  
Vol 9 (1S3) ◽  
pp. 352-355
Keyword(s):  
Thermal Decomposition ◽  
Dielectric Constant ◽  
Single Crystals ◽  
Mixed Solvent ◽  
Dielectric Studies ◽  
Crystalline Perfection ◽  
Growth Technique ◽  
Different Temperatures ◽  
Decomposition Stages ◽  
Solution Growth Technique

The highly meritorious single crystal ofDAST (4-N,N-dimethylamino-4’-N’-methylstilbazolium tosylate) was grown through solution growth technique. The grown single crystals crystalline perfection analysis was made by HRXRD studies. The dielectric constant (ε), dielectric loss (ε) of DAST crystal was studied at different temperatures. The thermal decomposition stages were examined by using thermogram of DAST crystal and also it was giving best description of kinetic changes. Dielectric character was studied to the DAST crystal. The dielectric character of DAST was too analyzed.

Dielectric properties of normal, reduced, and specially reduced rutile (TiO2) single crystals at room temperature

1969 ◽  
Vol 47 (1) ◽  
pp. 3-6 ◽  
Author(s):  
H. B. Lal ◽  
K. G. Srivastava
Keyword(s):  
Dielectric Constant ◽  
Relaxation Time ◽  
Dielectric Properties ◽  
Dielectric Loss ◽  
Oxygen Vacancy ◽  
Single Crystals ◽  
Room Temperature ◽  
Interfacial Polarization ◽  
Absorption Peak ◽  
Single Relaxation Time

The variation of the dielectric constant (ε′) and the dielectric loss (ε″) have been studied as a function of frequency (102 to 1010 c.p.s.) for normal (as grown), reduced (heated in vacuum), and specially reduced (heated in vacuum in presence of an asymmetric d.c. field) rutile single crystals parallel to c-axis at room temperature. Dispersions in ε′ have been observed in the frequency ranges 102 to 103 and 107 to 109 c.p.s. for all the samples with absorption peaks in ε″ at 2 × 102 and 6 × 107 c.p.s. Also an extra absorption peak in ε″ has been found at 2 × 104 c.p.s. for the specially reduced sample. The absorption peak at 2 × 102 c.p.s. has been observed by many workers and is typical for interfacial polarization. The peak at 6 × 107 c.p.s. appears to be due to a dipole rotation process with a single relaxation time and is identified as due to relaxation of dipoles formed between Ti3+ and a neighboring oxygen vacancy. The possible mechanism of relaxation for the 2 × 104 c.p.s. absorption peak is also discussed.

Comparative Study on Multifunctional Behaviors of La0.7Ca0.3MnO3 and La0.7Ca0.24Sr0.06MnO3 Single Crystals

2016 ◽  
Vol 1141 ◽  
pp. 196-203 ◽  
Author(s):  
Tejas M. Tank ◽  
Abhinav Bhargav ◽  
Yakov M. Mukovskii ◽  
Sankar P. Sanyal
Keyword(s):  
Single Crystals ◽  
Electrical Transport ◽  
Theoretical Models ◽  
Point Of View ◽  
Floating Zone ◽  
Transport Mechanisms ◽  
Temperature Coefficient Of Resistance ◽  
Ir Detectors ◽  
Application Point ◽  
Metal To Insulator Transition

We report the electrical-transport, magneto-transport, and magnetic properties of the hole doped La0.7Ca0.3MnO3 (LCMO) and La0.7Ca0.24Sr0.06MnO3 (LCSMO) single crystals, prepared using floating zone technique. The resistivity data shows the metal to insulator transition (TMI) occurs at 211 K and 290 K for LCMO and LCSMO single crystals respectively. The electrical transport mechanisms of these crystals are investigated by using different theoretical models, for temperatures below and above TMI. The magnetization measurements show that these single crystals exhibit ferromagnetic to paramagnetic transition temperature (TC) at 208 K for LCMO and 273 K for LCSMO single crystals. From device application point of view, both samples show the maximum MR of 98% for LCMO and 80% for LCSMO at 8 T applied magnetic field, while for bolometer IR detectors application point of view the temperature coefficient of resistance (TCR) are found to ~17% K-1 and 28% K-1 for LCMO and LCSMO respectively.

scholarly journals Comparative Dielectric Study of Binary Mixtures of Coriandar oil and Radish oil

2021 ◽  
Vol 37 (2) ◽  
pp. 308-313
Author(s):  
Mohammad Shafi Khan ◽  
Vishal Singh Chandel ◽  
Satyendra Pratap Singh
Keyword(s):  
Dielectric Constant ◽  
Dielectric Loss ◽  
Binary Mixtures ◽  
Dielectric Study ◽  
Dielectric Parameters ◽  
Temperature Controller ◽  
Different Temperatures

The present paper deals with the dielectric study (dielectric constant, dielectric loss) of two medicinal oils, coriandar and radish oil and their binary mixtures at different temperatures and frequencies. HP 4194A impedance gain/phase analyzer and temperature controller (Julabo, model number F-25, microprocessor controlled) were used for determination of dielectric parameters and maintaining the temperature of pure oils their binary mixtures.

scholarly journals Dielectric Studies on Fe3O4Nanodopedp-n-Alkyloxybenzoic Acids

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
S. Sreehari Sastry ◽  
L. Tanuj Kumar ◽  
T. Vishwam ◽  
V. R. K. Murthy ◽  
S. Lakshminaryana ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Liquid Crystals ◽  
Dielectric Loss ◽  
Relaxation Times ◽  
Dielectric Studies ◽  
Temperature Dependent ◽  
Smectic Phases ◽  
Frequency Changes ◽  
Textural Changes ◽  
The Stability

The stability of phase transition temperatures and textural changes for thermotropic pure and nanodopedp-n-alkyloxybenzoic acid mesogens were aimed to study at considerable time periods. Frequency and temperature dependent dielectric constant and dielectric loss for the pure and nanodoped liquid crystals were carried out. Significant anomalies in dielectric studies were observed near phase transitions when dielectric constant and dielectric loss had been measured as a function of temperature and frequency. Changes in dielectric constant and loss were observed and there were no apparent changes at high frequencies instead maintaining constant values. The variations in conductivity, activation energy, and relaxation times had also been studied in the nematic and smectic phases. The temperature dependent dielectric constant stability (temperature coefficient of dielectric constantτε) had shown shift in the observed frequency range of thermotropic liquid crystals corresponding to the change in the dielectric constant values.

Effect of trytophan as dopant on potassium acid phthalate single crystals

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Single Crystals ◽  
Room Temperature ◽  
Visible Region ◽  
X Ray Diffraction ◽  
X Ray ◽  
Slow Evaporation Technique ◽  
Absorption Studies ◽  
Evaporation Technique ◽  
Potassium Acid Phthalate ◽  
Acid Phthalate

Optically transparent single crystals of potassium acid phthalate (KAP, 0.5 g) 0.05 g and 0.1 g (1 and 2 mol %) trytophan were grown in aqueous solution by slow evaporation technique at room temperature. Single crystal X- ray diffraction analysis confirmed the changes in the lattice parameters of the doped crystals. The presence of functional groups in the crystal lattice has been determined qualitatively by FTIR analysis. Optical absorption studies revealed that the doped crystals possess very low absorption in the entire visible region. The dielectric constant has been studied as a function of frequency for the doped crystals. The thermal stability was evaluated by TG-DSC analysis.

Skin–core structured fluorinated MWCNTs: a nanofiller towards a broadband dielectric material with a high dielectric constant and low dielectric loss

2018 ◽  
Vol 6 (9) ◽  
pp. 2370-2378 ◽  
Author(s):  
Yang Liu ◽  
Cheng Zhang ◽  
Benyuan Huang ◽  
Xu Wang ◽  
Yulong Li ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Dielectric Loss ◽  
High Dielectric Constant ◽  
Dielectric Material ◽  
Epoxy Composite ◽  
Low Dielectric ◽  
High Dielectric

A novel skin–core structured fluorinated MWCNT nanofiller was prepared to fabricate epoxy composite with broadband high dielectric constant and low dielectric loss.

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