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.

FT-IR Spectroscopic and XRD Studies on Tris-Thiourea Strontium Chloride Single Crystals

2011 ◽  
Vol 8 (1) ◽  
pp. 201-204
Author(s):  
H. O. Jethva ◽  
R. R. Hajiyani
Keyword(s):  
Single Crystals ◽  
Xrd Analysis ◽  
Wave Number ◽  
Strontium Chloride ◽  
Orthorhombic Crystal ◽  
Orthorhombic Crystal Structure ◽  
Number Range ◽  
Aqueous Solvent ◽  
Powder Xrd Analysis ◽  
Ft Ir

There are various nonlinear optical materials having crystalline nature and find various applications in science and technology. Tris-thiourea strontium chloride was synthesized and single crystals were grown by the slow solvent evaporation technique using aqueous solvent. The grown crystals were characterized by Fourier Transform Infrared Spectroscopy (FT-IR), and X-ray diffraction analysis (XRD). The FT-IR spectra of these crystals were recorded in the wave number range 400-4000 cm-1 which reveals the presence of various functional groups. The powder XRD analysis suggested orthorhombic crystal structure.

scholarly journals FT-IR Spectroscopic and XRD Studies on Tetra-thiourea Strontium Chloride Single Crystals

2012 ◽  
Vol 9 (1) ◽  
pp. 165-167
Author(s):  
H. O. Jethva ◽  
R. R. Hajiyani2
Keyword(s):  
Single Crystals ◽  
Xrd Analysis ◽  
Wave Number ◽  
Strontium Chloride ◽  
Orthorhombic Crystal ◽  
Orthorhombic Crystal Structure ◽  
Number Range ◽  
Aqueous Solvent ◽  
Powder Xrd Analysis ◽  
Ft Ir

There are various nonlinear optical materials having crystalline nature and find various applications in science and technology. Tetra-thiourea strontium chloride was synthesized and single crystals were grown by the slow solvent evaporation technique using aqueous solvent. The grown crystals were characterized by Fourier Transform Infrared Spectroscopy (FT-IR), and Xray diffraction analysis (XRD). The FT-IR spectra of these crystals were recorded in the wave number range 400-4000cm-1 which reveals the presence of various functional groups. The powder XRD analysis suggested orthorhombic crystal structure.

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.

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.

Dielectric Properties of Pure and Strontium Doped Nano-Hydroxyapatite

2013 ◽  
Vol 209 ◽  
pp. 151-155 ◽  
Author(s):  
Kashmira P. Tank ◽  
Bhoomika V. Jogiya ◽  
Dinesh K. Kanchan ◽  
Mihir J. Joshi
Keyword(s):  
Dielectric Constant ◽  
Applied Field ◽  
Room Temperature ◽  
Dental Enamel ◽  
Dielectric Study ◽  
Frequency Range ◽  
Xrd Study ◽  
Nano Crystalline ◽  
Crystalline Nature ◽  
Inorganic Matrix

Hydroxyapatite (Ca10(PO4)6(OH)2-HAp), is an excellent inorganic biomaterial and finds various applications. As it is similar to inorganic matrix of human bone and dental enamel, pure and doped HAps are widely studied. In the present study, pure nano-HAp and Strontium doped nano-HAp (Sr-HAp) with different concentrations were synthesized by surfactant mediated approach. The doping of strontium was confirmed by EDAX. The powder XRD study was carried out and it suggested nano-crystalline nature of the sample and the extra peaks observed other than HAp were due to the presence of brushite phase for higher concentration of Sr. TEM study revealed the needle type morphology for all the samples with size ranging from 23 nm to 78 nm. The dielectric study was carried out at room temperature within the frequency range from 102 Hz to 107 Hz and the variations of dielectric constant with frequency of applied field as well as with the concentration of strontium were studied. The results are discussed.

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.

Modification in structural, functional, thermal, dielectric, impedance and nonlinear optical properties of ammonium pentaborate crystal by addition of di-sodium sulphide nanoparticles

2019 ◽  
Vol 33 (07) ◽  
pp. 1950084
Author(s):  
A. P. Kochuparampil ◽  
J. H. Joshi ◽  
H. O. Jethva ◽  
M. J. Joshi
Keyword(s):  
Nonlinear Optical ◽  
Complex Impedance ◽  
Precipitation Method ◽  
Dielectric Study ◽  
Sodium Sulphide ◽  
Frequency Range ◽  
Orthorhombic Crystal ◽  
Orthorhombic Crystal Structure ◽  
Nlo Properties ◽  
Co Precipitation

Ammonium penataborate (APB) crystals are well known for their nonlinear optical (NLO) properties. Attempt is made to study the changes produced by addition of chalcogenide compound sodium sulphide in APB crystals. Di-sodium sulphide (Na2S) is soluble in water and its solubility is further increased for Na2S nanoparticles. The Na2S nanoparticles are synthesized by using co-precipitation method followed by microwave irradiation. The slow solvent evaporation method is used to grow pure and Na2S added APB crystals. Pure and Na2S added APB crystals possess orthorhombic crystal structure with the mixed phase nature for the Na2S added APB. The presence of sodium in APB is confirmed by AAS study. In FTIR spectra the absorption peak of S–H asymmetric stretching is observed for Na2S added APB indicating the presence of sulphur. The thermal stability of APB crystal is enhanced on doping the Na2S in it. The dielectric study is also carried out within this frequency range. The Jonscher’s power law is applied to AC conductivity data. The impedance spectroscopy study is carried out at room temperature within 100 Hz to 1 MHz frequency range. The complex impedance and modulus plots are drawn. The complex impedance plots indicate only the grain contribution. The Kurtz and Perry powder study indicates that all the crystals are exhibiting NLO properties with varying SHG efficiency.

Spherulitic crystal growth in the prodissoconch larval of Crassostrea virginica

1983 ◽  
Vol 41 ◽  
pp. 518-519
Author(s):  
George G. Cocks ◽  
Louis Leibovitz ◽  
DoSuk D. Lee
Keyword(s):  
Crystal Structure ◽  
Crassostrea Virginica ◽  
Crystal Orientation ◽  
Developmental Changes ◽  
Gastrula Stage ◽  
Orthorhombic Crystal ◽  
Orthorhombic Crystal Structure ◽  
Stages Of Growth ◽  
Early Stages ◽  
Initial Deposition

Our understanding of the structure and the formation of inorganic minerals in the bivalve shells has been considerably advanced by the use of electron microscope. However, very little is known about the ultrastructure of valves in the larval stage of the oysters. The present study examines the developmental changes which occur between the time of conception to the early stages of Dissoconch in the Crassostrea virginica(Gmelin), focusing on the initial deposition of inorganic crystals by the oysters.The spawning was induced by elevating the temperature of the seawater where the adult oysters were conditioned. The eggs and sperm were collected separately, then immediately mixed for the fertilizations to occur. Fertilized animals were kept in the incubator where various stages of development were stopped and observed. The detailed analysis of the early stages of growth showed that CaCO3 crystals(aragonite), with orthorhombic crystal structure, are deposited as early as gastrula stage(Figuresla-b). The next stage in development, the prodissoconch, revealed that the crystal orientation is in the form of spherulites.

A New Phase of the Na+ Ion Conductor Na3PS4

2019 ◽  
Author(s):  
Theodosios Famprikis ◽  
James Dawson ◽  
François Fauth ◽  
Emmanuelle Suard ◽  
Benoit Fleutot ◽  
...  
Keyword(s):  
Solid Electrolytes ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Orthorhombic Crystal ◽  
Orthorhombic Crystal Structure ◽  
Ion Conductor ◽  
Solid State Batteries ◽  
Density Analysis ◽  
Two Phases ◽  
Dynamics Simulations

<div> <p>Solid electrolytes are crucial for next‑generation solid‑state batteries and Na<sub>3</sub>PS<sub>4</sub> is one of the most promising Na<sup>+</sup> conductors for such applications. At present, two phases of Na<sub>3</sub>PS<sub>4</sub> have been identified and it had been thought to melt above 500 °C. In contrast, we show that it remains solid above this temperature and transforms into a third polymorph, γ, exhibiting superionic behavior. We propose an orthorhombic crystal structure for γ‑Na<sub>3</sub>PS<sub>4</sub> based on scattering density analysis of diffraction data and density functional theory calculations. We show that the Na<sup>+</sup> superionic behavior is associated with rotational motion of the thiophosphate polyanions pointing to a rotor phase, based on <i>ab initio</i> molecular dynamics simulations and supported by high‑temperature synchrotron and neutron diffraction, thermal analysis and impedance spectroscopy. These findings are of importance for the development of new polyanion‑based solid electrolytes.</p> </div>

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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