Growth, Structural, NLO and Impedance Properties of Cu2+ doped Lithium Sulphate Monohydrate Single Crystals

2021 ◽  
Author(s):  
A Annalakshmi ◽  
K. Balasubramanian
Keyword(s):  
Single Crystals ◽  
Complex Impedance ◽  
Relative Dielectric Constant ◽  
Relaxation Mechanism ◽  
Tangent Loss ◽  
Monoclinic Crystal ◽  
Debye Relaxation ◽  
Nlo Property ◽  
Lithium Sulphate ◽  
Evaporation Technique

Abstract Single crystals of 2.5 mole% of Cu 2+ doped Lithium sulphate monohydrate (LSMH) have been grown using slow evaporation technique at room temperature. Powder X-ray diffraction (PXRD) analysis ensures that the crystal belongs to monoclinic crystal system. The variation of relative dielectric constant, dielectric loss and tangent loss with frequency have been discussed. The conductivity and dielectric relaxation mechanism involved in the grown crystals have been carried out by using complex impedance spectroscopy in the temperature range (343K and 353K) and in the frequency range from 20Hz to 2MHz. The frequency dependent ac conductivity obeys the Jonscher’s power law. The imaginary part Mʺ of electrical modulus of grown crystals shows the formation of asymmetric dispersion peak and indicating non- Debye relaxation behaviour. Morphology properties of the grown crystals have been studied using atomic force microscopy and hence the roughness of the grown crystals has been calculated. The NLO property and LDT values of the grown crystals are analysed using Nd:YAG laser operating at 1064 nm and 532 nm respectively.

scholarly journals Enhanced Linear and Non Linear Optical Activity of Lead Onto L-Threonine Cadmium Acetate Crystal

2021 ◽  
Author(s):  
Abila Jeba Queen M ◽  
K.C. Bright ◽  
S. Mary Delphine ◽  
P. Aji Udhaya
Keyword(s):  
Magnetic Behavior ◽  
Cadmium Acetate ◽  
Optical Parameters ◽  
Monoclinic Crystal ◽  
Nlo Property ◽  
Supramolecular Coordination ◽  
Dta Analysis ◽  
Evaporation Technique ◽  
Linear Optical ◽  
Lcr Meter

Abstract Herein, we describe the growth and characterization of new crystal lead doped L-Threonine cadmium acetate (LTCA). The supramolecular coordination compounds are crystallized by slow evaporation technique at ambient temperature. The X-ray diffraction techniques confirm monoclinic crystal system and the presence of lead onto the LTCA lattice. L-Threonine amino acids have the unique properties like zwitter ionic nature and molecular chirality, which improves the optical properties of the crystal. The linear optical parameters such as optical band gap and refractive indexes are estimated from Uv-Vis analysis. The variation of dielectric constant, dielectric loss with frequency is studied using LCR meter. Due to the electropositive character of lead the static permittivity increases. Magnetic behavior changes to paramagnetic nature due to the inclusion of lead. TG/DTA analysis suggests, the crystal is thermally stable up to 135.32°C. Using Nd-YAG laser the NLO property was studied and the crystal shows higher SHG efficiency than the LTCA crystal.

scholarly journals Effect of Microwave Sintering on Electrical Properties of Sr-deficient and Bi-rich Strontium Bismuth Niobate (Sr0.8Bi2.2Nb2O9) Ferroelectric Ceramic

2016 ◽  
Vol 1 (1) ◽  
pp. 35-45 ◽  
Author(s):  
RAJVEER SINGH ◽  
Vandna Luthra ◽  
Ram Pal Tandon
Keyword(s):  
Conduction Mechanism ◽  
Microwave Sintering ◽  
Complex Impedance ◽  
Negative Temperature ◽  
Ferroelectric Ceramic ◽  
Relaxation Mechanism ◽  
Bulk Resistance ◽  
Conventional Solid State Reaction ◽  
Debye Relaxation ◽  
Bismuth Niobate

Nonstoichiometric strontium bismuth niobate (Sr0.8Bi2.2Nb2O9: SBN) ceramic was prepared using conventional solid-state reaction and microwave sintering methods. Complex impedance spectroscopy (CIS) has been used to investigate the intra and intergranular contribution to the impedance SBN ceramics as a function of temperature and frequency. Complex impedance Cole‑Cole plots were used to interpret the relaxation mechanism in SBN ceramic which showed a non-Debye relaxation. The grain and grain boundary contribution to conductivity have been estimated from the Cole‑Cole plots. The bulk (grain) resistance of both samples was found to decrease with rise in temperature indicating negative temperature coefficient of resistance (NTCR) type behavior like that of semiconductors. The microwave sintered SBN was found to have low value of bulk resistance indicating more increase in conductivity as compared to conventionally sintered SBN. The temperature dependence of the relaxation time was found to obey the Arrhenius law. Studies of electrical modulus show the presence of hoping conduction mechanism in SBN.

scholarly journals Growth and Characterization of ULMA Single Crystals Doped with Ammonium Chloride

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
B. Sivasankari ◽  
P. Selvarajan
Keyword(s):  
Single Crystals ◽  
Ammonium Chloride ◽  
Visible Spectrum ◽  
Cutoff Wavelength ◽  
X Ray Diffraction ◽  
X Ray ◽  
Nlo Property ◽  
Evaporation Technique ◽  
Uv Visible

Single crystals of pure and ammonium chloride-doped urea L-malic acid (ULMA) were grown by slow evaporation technique. Many interesting results on several properties of ammonium chloride impurity added to ULMA single crystals have been observed and studied. The different morphology of ammonium chloride-doped ULMA crystals was noticed and the effect of ammonium chloride doping on the growth, optical, and hardness properties has been investigated. The presence of functional groups has been estimated by FTIR analysis. The lattice parameters of the grown crystals were studied by single crystal X-ray diffraction technique. Powder X-ray diffraction studies confirm the diffraction planes of the grown crystals. The UV-visible spectrum shows the cutoff wavelength at 220 nm. A study on the thermal properties has also been carried out. The NLO property of the grown crystals was confirmed by SHG studies.

Optical and Dielectric Studies of Cadmium Chloride Doped Single Crystals of Lithium Sulphate

2012 ◽  
Vol 584 ◽  
pp. 65-69
Author(s):  
P.S. Latha Mageshwari ◽  
R. Priya ◽  
S. Krishnan ◽  
V. Joseph ◽  
S. Jerome Das
Keyword(s):  
Single Crystals ◽  
Cadmium Chloride ◽  
Visible Region ◽  
X Ray Diffraction ◽  
X Ray ◽  
Slow Evaporation Technique ◽  
Lithium Sulphate ◽  
Absorption Studies ◽  
Evaporation Technique ◽  
Spectroscopy Optical

Excellent and optically transparent good quality single crystals of cadmium chloride doped with lithium sulphate monohydrate (LS) 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 cadmium chloride lithium sulphate (CCLS). The functional groups present in the CCLS crystals were determined qualitatively by using Fourier transform infrared (FTIR) spectroscopy. Optical absorption studies revealed that doped crystals acquire very low absorption in the entire visible region. Dielectric measurements show that the dielectric constant and dielectric loss of doped crystals decreases with increase of frequency.

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.

scholarly journals Piperazine based Zirconium Oxy-Chloride (PzZrOCl) single crystal: A Third Order Nonlinear Optical material for Opto-electronic Device Applications

2021 ◽  
Author(s):  
Mullai R U ◽  
Sreenadha Rao Kanuru ◽  
R. Arul Jothi ◽  
E. Vinoth ◽  
S. Gopinath ◽  
...  
Keyword(s):  
Single Crystals ◽  
Electronic Device ◽  
Green Emission ◽  
Elastic Stiffness ◽  
Visible Range ◽  
Elastic Stiffness Constant ◽  
Stiffness Constant ◽  
Device Applications ◽  
Evaporation Technique ◽  
Laser Induced Damage

Abstract Single crystals of Piperazine Zirconium Oxy-Chloride (PzZrOCl) are grown successfully by slow evaporation technique for Opto-electronic device applications. Suitability of the material is estimated and reported as follows. Crystal habits, purity, crystallite size, microstructure and bulk crystals structures are essential parameters for device compatibility hence they were examined with basic characterization techniques and studied to estimate their effects on optoelectronic properties. The outcomes from structural aspects are reasonably good. The functional groups of a molecule, their bond vibration frequencies and mode of alignments have been examined by Fourier Transform Infrared spectroscopy (FT-IR). The transmittance (98%) in the entire visible range with lowest cut-off wavelength (215 nm) and green emission (545 nm) is another evidence of suitability. The thermal and mechanical strength via hardness, Mayer index, yield strength and elastic stiffness constant is evaluated; it is thermally stable up to 162°C, mechanically strong and belongs to soft category. Laser induced damage is estimated by using Nd:YAG laser of wavelength 1064 nm and the observed values is three times higher than KDP, 1.2 times higher than LAPP. The optical nonlinear nature and its efficiency are examined by using Z-scan technique. The analysis discussed in detailed and the results strongly recommends PzZrOCl single crystals are suitable for optical and electronic device applications.

scholarly journals Synthesis, Spectral, Structural and Thermal Characterization of Inorganic Crystal: Phenyl Trimethylammonium Tetrachlorocobaltate

2019 ◽  
Vol 31 (8) ◽  
pp. 1779-1784
Author(s):  
V. Mohanraj ◽  
R. Pavithra ◽  
M. Thenmozhi ◽  
R. Umarani
Keyword(s):  
Three Dimensional ◽  
Thermal Characterization ◽  
Dimensional Structure ◽  
X Ray Diffraction ◽  
Monoclinic Crystal ◽  
Evaporation Technique ◽  
Ft Ir ◽  
Thermal Stability Of ◽  
Ft Ir Spectroscopy

Phenyl trimethylammonium tetrachlorocobaltate, crystals were grown by slow evaporation technique. The crystal was bright, transparent. The three dimensional structure of the phenyl trimethylammonium tetrachlorocobaltate was obtained from single crystal X-ray diffraction studies. The molecule belongs to monoclinic crystal system with C2/c space group. The presence of functional groups and modes of vibrations were identified by FT-IR spectroscopy. 1H NMR spectroscopy was also used to characterise the compound and the thermal stability of the crystal was established by TGA/DT analysis. This work undergoes phase transition which makes the study interesting.

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