Structural, optical, spectral and thermal studies of nonlinear optical pure and deuterated l-alanine single crystals

Kumar, K. Suriya; Raghavalu, Thenneti; Mathivanan, V.; Kovendhan, M.; Kumar, G. Ramesh; Raj, S. Gokul; Mohan, R.

doi:10.1016/j.jcrysgro.2007.12.049

Cited by 18 publications

(5 citation statements)

References 21 publications

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“…In the first stage, Figure 5b shows the TGA curve of the grown crystal ALA. It is noticed that there is a negligible weight loss up to 240 • C. About 30% of the sample got decomposed due to the liberation of volatile substances at 305 • C. The major weight loss occurred at 305 • C and the remaining 70% of the sample got completely decomposed at the temperature of 392 • C. Form the graph it is obvious that the grown crystal ALA is highly stable up to 240 • C which indicates that the crystal is a potential candidate for NLO applications [21,22]. Since ALA crystal can retain texture up to 240 • C, it is more stable than the other semi-organic crystals like L-alanine cadmium chloride (110 • C), triallyl thiourea cadmium chloride (101 • C), triallyl thiourea cadmium bromide (97 • C), triallyl thiourea mercury chloride (133 • C) and allyl thiourea mercury bromide (125 • C) [23].…”

Section: Thermal Characterizationmentioning

confidence: 96%

Influence of Zinc and Ammonium Compounds on the Growth and Characterisation of L Alanine NLO Crystals

Sagunthala¹,

Veeravazhuthi

Yasotha³

et al. 2018

Acta Phys. Pol. A

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Single crystals of zinc sulphate monohydrate L alanine and ammonium sulphate L alanine had been grown by slow evaporation technique. The crystalline nature and unit cell parameters of the grown crystals were determined using powder and single crystal X-ray diffraction. The grown crystals retained the orthorhombic crystal system. UV-vis transmittance and second harmonic generation studies were performed to analyze the optical behaviour of the crystals. The Fourier transform infrared spectra were recorded in the region 4000-400 cm −1 to identify the presence of functional groups. Thermogravimetric analysis helped to determine the percentage of decomposition of the sample at different temperatures as well as the thermal stability of the compound. Mechanical and electrical properties of grown crystals were ascertained through the Vickers micro hardness and dielectric studies.

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Section: Thermal Characterizationmentioning

confidence: 96%

Influence of Zinc and Ammonium Compounds on the Growth and Characterisation of L Alanine NLO Crystals

Sagunthala¹,

Veeravazhuthi

Yasotha³

et al. 2018

Acta Phys. Pol. A

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“…Recently we have reported on the growth, deuteration and nucleation studies on L-alanine single crystals [14,15]. In the present investigation, good optical quality L-alanine single crystals have been grown from aqueous solution by slow cooling and seed rotation techniques.…”

Section: Introductionmentioning

confidence: 95%

Structural and hardness of nonlinear optical L-alanine single crystals

Raj¹,

Kumar²

2011

Adv. Mater. Lett.

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Single crystals of pure and Deuterated L-alanine have been grown by both slow cooling and seed rotation techniques. The grown nonlinear optical crystals were subjected to single crystal X-ray diffraction for determining its lattice parameters and morphology. Thermal expansion measurements were carried for the Deuterated crystals of L-alanine using thermomechanical analyzer in order to ascertain the strain tensors along the three mutually perpendicular crystallographic directions. Microhardness study was also undergone on deuterated L-alanine single crystals on a prominent plane for determining the mechanical strength of the grown crystals. The results have been discussed in detail.

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“…In this work, l-alanine is mixed with inorganic salts such as Li 2 SO 4 to form a semiorganic novel material which is expected to have improved NLO properties. Some complexes of l-alanine have recently been crystallized and various studies have been investigated by many researchers [25][26][27][28][29]; this led us to add lithium sulphate into l-alanine. In this work, an attempt has been made to synthesize and grow lithium sulphate admixtured l-alanine (LSLA) crystal by the solution method; it is then compared with pure l-alanine.…”

Section: Introductionmentioning

confidence: 99%

Growth and characterization of pure and semiorganic nonlinear optical Lithium Sulphate admixtured l-alanine crystal

Vela

Selvarajan²,

Freeda

et al. 2013

Phys. Scr.

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Lithium sulphate admixtured l-alanine (LSLA) salt was synthesized and the solubility of the commercially available l-alanine and the synthesized LSLA sample was determined in de-ionized water at various temperatures. In accordance with the solubility data, the saturated aqueous solutions of l-alanine and lithium admixtured l-alanine were prepared separately and the single crystals of the samples were grown by the solution method with a slow evaporation technique. Studying single x-ray diffraction shows that pure and LSLA crystal belong to the orthorhombic system with a non-centrosymmetric space group P2 1 2 1 2 1 . Using the powder x-ray diffraction study, the crystallinity of the grown crystals is confirmed and the diffraction peaks are indexed. The various functional groups present in the pure and LSLA crystal are elucidated from Fourier transform infrared spectroscopy study. UV-visible transmittance is recorded to study the optical transmittance range for the grown crystals. The powder second harmonic generation test confirms the nonlinear optical property of the grown crystals. From the microhardness test, the hardness of the grown crystals is estimated. The dielectric behaviour, such as the dielectric constant and the loss of the sample, are measured as a function of temperature and frequency. The ac conductivity of the grown crystals is also studied and the activation energy is calculated.

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Structural, optical, spectral and thermal studies of nonlinear optical pure and deuterated l-alanine single crystals

Cited by 18 publications

References 21 publications

Influence of Zinc and Ammonium Compounds on the Growth and Characterisation of L Alanine NLO Crystals

Influence of Zinc and Ammonium Compounds on the Growth and Characterisation of L Alanine NLO Crystals

Structural and hardness of nonlinear optical L-alanine single crystals

Growth and characterization of pure and semiorganic nonlinear optical Lithium Sulphate admixtured l-alanine crystal

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