The growth of single crystals and their characterization towards device fabrication has gained great momentum due to their significant applications in the fields of semiconductors, solid-state lasers, nonlinear optics , piezoelectric, photosensitive materials and crystalline thin films for the microelectronics and computer industries. In particular, nonlinear optics plays an important role in the emerging fields of laser technology, optical communication, data storage technology, photonics and optoelectronics. So nonlinear optical materials are important for future photonic technologies based on the fact that photons are capable of processing information at the speed of light. So the growth of new and promising nonlinear optical materials receives great attention and finds its application in various fields of optical disk data storage and laser remote sensing. Say no to plagiarism. Get a tailor-made essay on "Why Violent Video Games Shouldn't Be Banned"? Get Original Essay Many organic and inorganic nonlinear optical materials with good optical and mechanical properties have been reported in the literature. Compared with these crystals, semiorganic nonlinear optical crystal has the advantage of both organic and inorganic materials. They have a high damage threshold, a wide transparency range, excellent nonlinear optical coefficient and superior mechanical properties. Guanidinium-based organic and inorganic compounds play a vital role in the field of nonlinear optical crystal growth. The guanidine ion [C (NH2)3]+ is an important functional group present in the amino acid and also the basic constituent of many biologically active molecules. Various derivatives of the guanidinium ion are used in explosives and rocket repellent formulations. Guanidinium is a strong base that reacts with most organic acids resulting in the formation of guanidinium species. The three-fold symmetry of the guanidinium ion with six equivalent hydrogen atoms provides excellent conditions for hydrogen bonds, and this property has made guanidinium compounds as potential materials in the field of nonlinear optical crystal growth and their applications. The crystal structure, vibrational spectroscopic studies and ferroelectric properties of some metallic guanidino sulfates have been reported in the literature. Many guanidinuim-based nonlinear optical crystals have been grown and reported from our laboratory. In this article we discuss the growth and characterization studies of the semi organic guanidinium compound guanidinium tris cadmium sulfate octahydrate [GuCdS]. Synthesis and Crystal Growth Guanidinium cadmium sulfate octahydrate compounds were synthesized using AR grade reagents guanidinium carbonate, concentrated sulfuric acid, and cadmium sulfate octahydrate and were taken in an equimolar stoichiometric ratio for the synthesis of the title compound. Distilled water was used as the solvent and the crystallization was carried out at room temperature. The solution was stirred well using a magnetic stirrer for six hours to ensure homogeneous concentration and was filtered using Whatmann filter paper and held for slow evaporation of the solvent in a dust-free atmosphere. The pH value of the solution was found to be equal to 1. After a few days it was found that the GuCdS compound crystallized at the bottom of the glass. The following equation explains the synthesis scheme.[C (NH2)3]2CO3 + H2SO4 → [C (NH2)3]2 SO4+H2O+CO2 ↑[C (NH2)3]2 SO4 + 3CdSO4 8 H2O → [3Cd {C(NH2)3}2] (SO4)2. 8H2OThe purity of the synthesized compound was further improved byrepeated recrystallizations with the same solvent and was used for bulk crystal growth. A 100 mL saturated aqueous GuCdS solution was prepared from the recrystallized guanidinium sulfate cadmium salt and allowed to evaporate in a dust-free atmosphere. After a period of thirteen days, transparent and defect-free single crystals of cadmium guanidinium sulfate were collected and are shown in Fig. 1. Powder X-ray diffraction analysis The powder X-ray diffraction method is a decisive for the qualitative phase analysis. The powder structure of a crystal is also important in determining the crystallinity and phase purity of the grown crystal. Powder X-ray diffraction analysis of the grown crystal was recorded using RICH SIEFERT powder X-ray diffractometer with Cu Kα radiation (λ=1.5406Å). The grown crystals were ground using an agate mortar and pestle and subjected to powder X-ray diffraction analysis. The sample was scanned in the range 10º-70º in 0.04º increments. The powder X-ray diffraction spectrum of the grown crystal is shown in Fig. 2. The intense and sharp peaks in the diffractogram indicate the good crystalline perfection of the grown crystals. The two theta values ​​obtained from the X-ray analyzes of the dust were used to index the dust model. Peak indexing and evaluation of lattice cell parameters were carried out using Powder centrosymmetric crystal. The obtained cellular parameters of the crystal are a = 6.444 Å, b = 6.456 Å, c = 10.020 Å, α = 90.16˚, β = 97.035˚ and γ = 110˚. FTIR Spectral Analysis To identify the various functional groups present in On the grown guanidinium cadmium sulphate crystal, FTIR spectral analysis was carried out. The FTIR spectrum of the powdered sample was recorded using Perkin Elmer Spectrum-1 in the range of 4000 to 450 cm-1. The assignment of the spectral bands was carried out in terms of fundamental modes of vibration of the guanidinium ion [C(NH2 )3]+, sulphate ion (SO42-) and water molecules [7]. The recorded FTIR spectrum of guanidinium cadmium sulfate is shown in Fig. 3. Vibrations of guanidinium ions The assignment of vibrational modes in the guanidinium ion can be made in terms of CN3 and NH2 groups. In the IR spectrum of the GuCdS compound, a strong and sharp band at 1624 cm-1 is due to the asymmetric stretching vibrations of the CN3 group. Vibrations of the sulfate group The sulfate group (SO42-) in its free ion state exhibits four fundamental modes of vibration. The modes are the non-degenerate symmetric stretching mode (ν1), the doubly degenerate symmetric bending mode (ν2), the triple degenerate asymmetric stretching mode (ν3), and the triple degenerate asymmetric bending mode (ν4) with numbers of wave 981 cm-1, 451 cm-1, 1108 cm-1 and 613 cm-1 respectively. Among the four different vibration modes only (ν3) and (ν4) are IR active. The triple degenerate asymmetric stretching mode (ν3) of sulfate ion has a strong band at 1117 cm-1 and the triple degenerate asymmetric bending mode (ν4) appears at 619 cm-1 in the FTIR spectrum.3.2.3 Vibrations of molecule d 'waterA water molecule in general has three fundamental modes of vibration: (ν1) at 3652 cm-1, (ν2) at 1595 cm-1 and (ν3) at 3756 cm-1. The IR spectrum of the GuCdS compound contains strong bands at 3451 and 3523 cm-1 assigned to the ν1 and ν3 vibrational modes of the water molecule. The vibrational band assignments of the FTIR spectrum of the grown crystal were found to be consistent with those 80.