Growth, thermal and microhardness studies of single crystals of potassium penta borate (KB5) (original) (raw)
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Growth and characterization of pure and doped potassium pentaborate (KB5) single crystals
Journal of Crystal Growth, 2003
Single crystals of pure and Mg + , Ba + , Ca + and Cu + doped potassium pentaborate (KB5) have been grown by low temperature solution growth technique. The growth conditions and surface morphology of pure and doped single crystals of KB5 are optimized and the grown crystals are confirmed by XRD. The pure and doped crystals of KB5 are subjected to TGA and DSC studies. Using the TGA and DSC curves, the enthalpies, decomposition temperature (T d ) and weight loss are measured and the results are analysed and discussed. The influence of the presence of added dopants on the microhardness behaviour of Mg + , Ba + , Ca + and Cu + doped KB5 crystals are also studied and discussed. The SHG of the pure and doped samples of KB5 is confirmed by Nd:YAG pulsed laser employing the Kurtz powder technique. r 2002 Elsevier Science B.V. All rights reserved.
Materials Today: Proceedings, 2018
A new nonlinear optical material L-Arginine doped potassium penta borate (LAKB 5) Single Crystals have been grown by slow evaporation solution growth technique from its aqueous solution. The synthesized compound was subjected to single crystal X-ray diffraction analysis to recognize the morphology and structure. An assortment of modes of vibrations there in the crystal was identified with FTIR. The linear and nonlinear optical investigations were recorded in identification of optical transmission spectrum and Second Harmonic Generation (SHG). The mechanical strength have been checked by Vicker's microhardness tester and consequently various parameters such as yield strength (σ v), elastic stiffness constant (C 11), fracture toughness (K c) and brittleness index (B i) were calculated and reported for the first time.
International Journal for Research in Applied Science and Engineering Technology
Potassium pentaborate (KB 5 O 8. 4 H 2 O or K(H 4 B 5 O 10).2H 2 O or KBO 5) single crystals were grown by slow evaporation solution growth method at room temperature and the properties of the grown crystals were investigated. L-Methionine doped Potassium pentaborate (LMPPB) single crystals were grown by slow evaporation solution growth method and the characterization for the obtained materials were done using powder x-ray diffraction, FT-IR, UV-Vis and thermal analysis methods. Powder X-ray diffraction studies were carried out to determine the crystal structure and lattice parameters of the grown crystals by using powder-x software.. The optical transmittance of the crystal was determined by recording UV-Vis spectrum. pure KBO 5 and L-Methionine potassium pentaborate (LMPPB) single crystals were synthesized from its aqueous solution at ambient temperature. XRD confirmed the orthorhombic nature of the crystals. The UV-Vis spectroscopy highlighted the transparent nature of the LMPPB crystal. The various functionalities slot in the synthesized compound were analysed by FT-IR technique. The TGA analyses showed the thermal stability and the melting point of LMPPB.
Optical properties of some borate single crystals
International Conference on Solid State Crystals 2000: Growth, Characterization, and Applications of Single Crystals, 2001
This paper describes efforts taken in Institute of Applied Physics and Institute of Electronic Materials Technology to obtain several single crystals from borate family, namely CsLiB6010 (CLBO), Ca 4 GdO(BO 3 ) 3 (GdCOB), Li 2 B 4 0 7 (TBO), 03-BaB 2 0 4 (BBO), and YA1 3 (BO) 4 (YAB), pure and doped with several ions. The main goal of this investigation was to develop technology of these new nonlinear optical materials to create possibility of their applications in higher harmonics generators and self-frequency doubling lasers. Depending on such properties of crystallized borate materials as incongruent melting or high temperature phase transitions, Czochralski technique or high temperature solution growth technique were used. The main aspects of crystallization of these materials as well as their optical properties are discussed.
New nonlinear optical and laser crystals of borate family
Journal of Materials Science: Materials in Electronics, 2007
Er,Yb):YAl 3 (BO 3 ) 4 single crystals have been obtained using K 2 Mo 3 O 10 based flux by dipping seeded solution growth at a cooling rate of 0.2-5°C/day at temperatures from 1060°C to 1000°C. The Er and Yb segregation coefficients vary from 0.80 to 1.02. A valuable technique for characterizing the non-linear performance of the crystal to identify the presence of twins in borate materials has been developed. Over 1.1 W of green emission was obtained from a diode-pumped Yb:YAB laser. Spectroscopic properties of Er,Yb:YAB crystals have been investigated leading to the demonstration of efficient continuous-wave (CW) and Q-switched diode-pumped (Er,-Yb):YAB laser operation.
Journal of Crystal Growth, 2017
Large size and high quality KCl 1-x Br x mixed crystals [with x = 0.0 (pure KCl), 0.2, 0.4, 0.5, 0.6, 0.8 and 1.0 (pure KBr)] have been grown with suitable raw material proportion by the melt (Czochralski) method using the miscible alkali halides KCl and KBr. The grown crystals have been characterized by determining their density, refractive index, lattice constant, chemical composition, thermal parameters (Debye-Waller factor, Debye temperature and Debye frequency), optical absorption, micro hardness and electrical parameters (dielectric constant, dielectric loss factor, AC, and DC electrical conductivities and AC, and DC activation energies) through X-ray diffraction, optical, mechanical and electrical (both AC and DC at various temperatures in the range 30-150 o C) measurements. Results obtained in the present study indicate that mixing KCl with KBr leads to significant tuning of thermal, optical, mechanical and electrical properties without disturbing the crystal structure. The dielectric constant is found to increase several times due to mixing and KCl 0.5 Br 0.5 crystal has the maximum value.
Photoconductivity and dielectric studies of potassium pentaborate crystal (KB5
Bulletin of Materials Science, 2003
Single crystal of potassium pentaborate (KB5) has been grown by solution growth technique. FTIR and laser Raman measurements are carried out to make a qualitative analysis on KB5 crystal. Dielectric behaviour of the KB5 crystal has been studied in the microwave region using K-band microwave bench equipped with the Gunn Oscillator guided with rectangular wave-guide. To confirm the suitability of this crystal as electro optic device, its dielectric behaviour with the change of frequency has also been investigated. Photoconductivity studies were also carried out on this material. It was interesting to observe that the KB5 crystal exhibited negative photoconductivity.