Hydroxyapatite films on silicon single crystals by a solution technique: texture, supersaturation and pH dependence

1995 ◽  
Vol 6 (2) ◽  
pp. 94-104 ◽  
Author(s):  
P. E. Wang ◽  
T. K. Chaki
Keyword(s):  
Single Crystals ◽  
Ph Dependence ◽  
Solution Technique

The pH dependence of impurity uptake by KDP single crystals

1973 ◽  
Vol 16 (2) ◽  
pp. 256-258
Author(s):  
L. A. Cherednik ◽  
V. N. Portnov ◽  
A. V. Belyustin
Keyword(s):  
Single Crystals ◽  
Ph Dependence

Growth and structural and physical properties of diisopropylammonium bromide molecular single crystals

2016 ◽  
Vol 49 (6) ◽  
pp. 2053-2062 ◽  
Author(s):  
Harsh Yadav ◽  
Nidhi Sinha ◽  
Sahil Goel ◽  
Abid Hussain ◽  
Binay Kumar
Keyword(s):  
Single Crystals ◽  
Grown Crystal ◽  
Three Dimensional ◽  
Solution Technique ◽  
X Ray Diffraction ◽  
X Ray ◽  
Dielectric Constant And Loss ◽  
Vis Spectroscopy ◽  
Direct Band ◽  
Crystallographic Axes

Large single crystals of the promising molecular organic ferroelectric diisopropylammonium bromide (DIPAB) have been grown by the solution technique. A structural study was performed using single-crystal X-ray diffraction analysis. The twin element of a selected DIPAB crystal was identified by a morphological study. Intermolecular interactions present in the grown crystal were explored by Hirshfeld surface (three-dimensional) and fingerprint plot (two-dimensional) studies. In UV–vis spectroscopy, the DIPAB crystal has shown high transparency with a wide direct band gap of 5.65 eV. In the photoluminescence spectrum, sharp UV and blue emissions were observed at 370, 392, 417 and 432 nm. The electrical properties were investigated by measuring the dielectric constant (∊) and loss (tanδ) of the grown crystal. The DIPAB crystal exhibits a promising piezoelectric charge coefficient (d33) value of 18 pC N−1, which makes it suitable for transducer applications. A high ferroelectric Curie temperature (Tc≃ 425 K) with high remnant polarization (20.52 µC cm−2) and high coercive field (12.25 kV cm−1) were observed in the as-grown crystal. Vickers microhardness analysis shows that the value of Meyer's index (n= 7.27) belongs to the soft material range, which was also confirmed by void analysis along three crystallographic axes. It is shown that the DIPAB crystal has potential for optical, ferroelectric and piezoelectric applications.

Growth Mechanism of Large-Size Rubrene Single Crystals Grown by a Solution Technique

2010 ◽  
Vol 49 (9) ◽  
pp. 095501 ◽  
Author(s):  
Pengqiang Zhang ◽  
Xionghui Zeng ◽  
Jiancheng Deng ◽  
Kai Huang ◽  
Feng Bao ◽  
...  
Keyword(s):  
Single Crystals ◽  
Growth Mechanism ◽  
Solution Technique ◽  
Large Size

Unidirectional growth and characterization of L-tartaric acid single crystals

2013 ◽  
Vol 46 (4) ◽  
pp. 993-998 ◽  
Author(s):  
K. Moovendaran ◽  
S. Natarajan
Keyword(s):  
Single Crystals ◽  
Tartaric Acid ◽  
Second Harmonic ◽  
Nir Spectroscopy ◽  
Damage Threshold ◽  
Laser Damage Threshold ◽  
Solution Technique ◽  
X Ray Diffraction ◽  
Second Harmonic Generation Efficiency ◽  
X Ray

Single crystals of L-tartaric acid (LTA), an organic nonlinear optical material, have been grown using a home-built crystal growth setup (the Moovendaran–Kalyanasundar–Natarajan setup). Crystals of LTA were also grown by the slow evaporation solution technique. These single crystals were characterized using single-crystal X-ray diffraction, high-resolution X-ray diffraction, and IR and UV–Vis–NIR spectroscopy. In addition, measurements of Vickers microhardness, laser damage threshold value and second harmonic generation efficiency are reported. Thermal, dielectric and photoluminescence studies were also carried out.

The pH dependence of OH radical formation in photo-electrochemical water oxidation with rutile TiO2 single crystals

2015 ◽  
Vol 17 (45) ◽  
pp. 30570-30576 ◽  
Author(s):  
Yukihiro Nakabayashi ◽  
Yoshio Nosaka
Keyword(s):  
Reaction Mechanism ◽  
Single Crystals ◽  
Alkaline Solution ◽  
Water Oxidation ◽  
Oxidation Process ◽  
Ph Dependence ◽  
Experimental Results ◽  
Radical Formation ◽  
Oh Radical ◽  
Rutile Tio2

The experimental results in photoelectrolysis with rutile (100) and (110) TiO2 single crystals support a plausible reaction mechanism that the surface Ti–O–O–Ti structure is an intermediate of water oxidation process, by which mechanism the O2 production becomes favorable in alkaline solution.

OPTICAL PROPERTIES OF ANTHRACENE SINGLE CRYSTALS GROWN BY A SIMPLE SOLUTION TECHNIQUE

2013 ◽  
Vol 27 (08) ◽  
pp. 1350022 ◽  
Author(s):  
HONGYA WU ◽  
JI ZHOU
Keyword(s):  
Optical Properties ◽  
Single Crystals ◽  
Spectroscopic Ellipsometry ◽  
Band Gap Energy ◽  
Dielectric Anisotropy ◽  
Solution Technique ◽  
High Quality ◽  
Gap Energy ◽  
Large Size ◽  
Window Material

Large-size and high-quality anthracene single crystals were prepared simply by solution technique. The basal planes correspond to (001) face and two large lateral faces of the anthracene crystals determined to be the (100) plane can also be obtained. The optical properties of the obtained anthracene single crystals were studied. The results indicate that anthracene can be a good window material up to 410 nm as the transmittance of the obtained crystal is around 70% from 800 nm to 410 nm and the band gap energy is 3.02 eV. The dielectric components in x-, y- and z-directions of the obtained crystals were extracted by fitting the results from spectroscopic ellipsometry and the results indicate the dielectric anisotropy of anthracene single crystals. The reflectivity calculated from the permittivity is close to the measured results.

An insight into the synthesis, crystal structure, geometrical modelling of crystal morphology, Hirshfeld surface analysis and characterization ofN-(4-methylbenzyl)benzamide single crystals

2017 ◽  
Vol 50 (5) ◽  
pp. 1498-1511 ◽  
Author(s):  
Sahil Goel ◽  
Harsh Yadav ◽  
Nidhi Sinha ◽  
Budhendra Singh ◽  
Igor Bdikin ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
Molecular Orbital ◽  
Surface Analysis ◽  
Title Compound ◽  
Crystal Morphology ◽  
Hirshfeld Surface ◽  
Hirshfeld Surface Analysis ◽  
Orbital Energy ◽  
Solution Technique

A versatile approach for the synthesis ofN-(4-methylbenzyl)benzamide, C15H15NO, using CuI as catalyst has been reported. Single crystals of the synthesized compound were grown using the slow evaporation solution technique. The crystal structure of theN-(4-methylbenzyl)benzamide crystals has been determined by single-crystal X-ray diffraction. The compound crystallizes in an orthorhombic lattice, noncentrosymmetric space groupPna21. The crystal structure is stabilized by intermolecular N—H...O hydrogen bonds and weak C—H...π interactions to form layers parallel to theaaxis. A user-friendly approach based on centre of mass propagation vector theory was used to predict the crystal morphology. The framework developed here utilizes the concept of intermolecular bond strength to discern the crystal morphology. Fourier transform IR, NMR and high-resolution mass spectrometry analytical techniques were used for the identification of functional groups and confirmation of the structure of the title compound. All of the intermolecular interactions present in the crystal structure, including the C—H...π, C—H...O and N—H...O interactions, were investigated and confirmed by molecular Hirshfeld surface analysis. From linear optical spectroscopy, the transmittance, optical band gap and UV cutoff wavelength were determined. The photoluminescence emission spectrum was recorded for a grown crystal. Dielectric measurements were performed at room temperature for various frequencies. The mechanical strength of the (001) plane of the title compound was measured using the Vickers micro-hardness technique. A piezo-coefficient of 15 pC N−1was found along the (001) plane of the title crystals. The thermal stability and melting point were also investigated. In addition, density functional theory simulations were used to calculate the optimized molecular geometry and the UV–vis spectrum, and to determine the highest occupied molecular orbital/lowest unoccupied molecular orbital energy gap. The results show thatN-(4-methylbenzyl)benzamide is a potential candidate for multifunctional optical and piezoelectric crystals.

Growth mechanism of large-size anthracene single crystals grown by a solution technique

2009 ◽  
Vol 311 (23-24) ◽  
pp. 4708-4713 ◽  
Author(s):  
Pengqiang Zhang ◽  
Jiancheng Deng ◽  
Xionghui Zeng ◽  
Zhenghui Liu ◽  
Yongxin Qiu ◽  
...  
Keyword(s):  
Single Crystals ◽  
Growth Mechanism ◽  
Solution Technique ◽  
Large Size

Growth of Copper Sulfate Pentahydrate Single Crystals by Slow Evaporation Technique

2017 ◽  
Vol 13 (2) ◽  
pp. 4651-4656 ◽  
Author(s):  
Nabeel A. Bakr ◽  
Tariq A. Al- Dhahir ◽  
Saja B. Mohammad
Keyword(s):  
Single Crystals ◽  
Energy Gap ◽  
Solution Technique ◽  
Slow Evaporation ◽  
Ftir Studies ◽  
Sulfate Pentahydrate ◽  
Slow Evaporation Technique ◽  
Copper Sulfate Pentahydrate ◽  
Evaporation Technique ◽  
Xrd Patterns

Single crystals of CuSO4.5H2O (CSP) were grown by slow evaporation solution technique at room temperature from its aqueous solution with molarity (0.25, 0.5 and 1.5) M. The sizes of the crystals were up to (39×12×3) mm3, (33.05×30.5×4.7) mm3 and (19.12×15.3×5.5) mm3 respectively. XRD patterns were recorded for powder of single crystals to find the parameters of crystals. FTIR studies confirm the presence of various functional groups in the crystals. The optical absorption was study by using UV-Vis analysis. The spectra show low absorbance in the range between 300 nm and 550 nm. Energy gap (Eg) of crystals was found to be (4.17, 4.19 and 4.25) eV at the molarity of (0.25, 0.5 and 1.5) M respectively.

Sign in / Sign up

Export Citation Format

Share Document