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Studies on the growth and characterization of L-cysteine hydrogen fluoride single crystal

Mohammed Azeezaa Varsha, Sagadevan Suresh

Materials Science Poland

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2019

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Vol. 37, No. 3

304--309

EN

L-cysteine hydrogen fluoride (LCHF) single crystals were grown from aqueous solution. Single crystal X-ray diffraction, FT-IR, UV-Vis-NIR, and TG-DTA were used to test the grown crystals. The specimen dielectric and mechanical behaviors were also studied. Powder X-ray diffraction of the grown crystal was recorded and indexed. The optical properties of the LCHF crystal were determined using UV-Vis spectroscopy. It was found that the optical band gap of LCHF was 4.8 eV. The crystal functional groups were identified using FT-IR. Second harmonic generation (SHG) efficiency of the LCHF was three times higher than that of KDP. The dielectric constant, dielectric loss and AC conductivity were measured at different frequencies and temperatures.

2

Growth, electrical, thermal, mechanical and etching studies on 4-chloroanilinium hydrogen (2R, 3R)-tartrate monohydrate-an organic NLO single crystal

Sivakumar R., Nadaraj V.

Materials Science Poland

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2019

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Vol. 37, No. 3

310--316

EN

An organic single crystal of 4-chloroanilinium hydrogen (2R,3R)-tartrate monohydrate (4CAHT) was grown by slow evaporation solution growth technique at room temperature. Single crystal XRD study confirmed that the crystal belongs to monoclinic system with the space group P21. Powder XRD analysis confirmed the crystalline nature of the compound. The presence of various functional groups in the compound was revealed by FT-IR analysis. UV studies showed the absence of absorption in the entire visible region. To determine the thermal stability of the grown crystals it was subjected to thermogravimetric and differential thermal analyses. Microhardness and etching studies were also carried out for the crystal. The powder second harmonic generation efficiency of 4CAHT was tested by Kurtz and Perry powder technique and the relative SHG efficiency of 4CAHT was found to be 1.44 times greater than that of standard KDP.

3

Application of ultrasonic velocity measurement and thermal analysis for determination of limestone quality

Kilic O.

Physicochemical Problems of Mineral Processing

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2014

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Vol. 50, iss. 2

525--534

EN

Limestone is an important industrial raw material. It is consumed by chemical and other industries (84%), used as refractory and road construction material (12%) and applied in civil engineering and agricultural applications (4%). Substantial amounts of limestone are also used as lime in the iron and steel industry. The aim of this study was to determine the properties of limestones. The chemical, physical and thermal properties of limestones were determined by standard methods while the P-wave velocities of limestones were measured with an ultrasonic non-destructive tester and relationships between limestone properties were estimated. It was found that there is a statistical correlation between physical properties and the P-wave velocity of limestones. The P-wave velocity is a very good characteristic parameter for the study and estimation of the limestone quality.