Heat transfer process during the crystallization of benzil grown by the Bridgman–Stockbarger method

Barvinschi, F.; Stănculescu, Anca; Stanculescu, Florin

doi:10.1016/j.jcrysgro.2010.11.028

Cited by 7 publications

(8 citation statements)

References 12 publications

(14 reference statements)

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“…As a consequence, the experimental conditions used to grow pure m-DNB crystals (∆T = 25°C, v = 1.7 mm h -1 ) and iodine doped m-DNB crystals (∆T = 30°C, v = 2.0 mm h -1 ) are fixing the limits for the product ΔC × m that assure a stable growth and are compatible with the experimental conditions for a stable growth of pure and doped benzil crystals, previously presented [20,21]. Therefore, it is possible to grow m-DNB and Bz crystals in the same experimental conditions, such as the selected conditions which are characterised by high ∆T and v, even for high concentration gradients at the growth interface [19].…”

Section: Introductionmentioning

confidence: 78%

“…The previous results on growth interface stability for Bz crystal [20,21] have been completed with new conclusions on the stable growth of m-DNB crystals. We will emphasise the conditions favouring the initiation of instabilities, which are associated with structural defects and compositional non-homogeneities in the crystal of m-DNB affecting the optical properties including the ONL properties.…”

Section: Introductionmentioning

confidence: 99%

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Organic Semiconductors for Non-Linear Optical Applications

Stănculescu¹,

Stanculescu²

2015

Optoelectronics - Materials and Devices

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The organic molecules represent a promising research field because they show special properties which are determined by the conjugated system of π electrons and the groups substituted to the aromatic nucleus offering perspectives for a large area of applications, including the non-linear optics.We have investigated two types of molecular crystalline material prepared from aromatic derivatives, meta-dinitrobenzene (m-DNB) and benzil (Bz), and three types of organic thin films prepared from arylenevinylene (triphenylamine, carbazole) compounds, maleimidic derivatives and anilinic derivatives functionalised copolymers using different methods (matrix-assisted pulsed laser evaporation, vacuum evaporation, spin coating). The effect of the experimental conditions on the morphological and structural particularities of the films has been emphasised. New results are bought about the systems formed from an aromatic derivative (m-DNB and benzil) crystal and inorganic (organic) dopant studied from the point of view of the dopant incorporation considering the stability of the growth interface and its effect on the optical band gap and optical non-linear (ONL) properties of the m-DNB and Bz crystals. The relationship between the morphology and structural order of the maleimidic derivatives monomers in polycarbonate matrix composite layer and the ONL properties is discussed. We analysed the correlation between the molecular structure of organic compound, particularities of the macroscopic order (influenced by the crystal growth and thin-film deposition methods) and optical non-linear (second harmonic generation, two-photon fluorescence) properties.The aromatic derivatives such as meta-dinitrobenzene (m-DNB) and benzil (Bz) are organic compounds of interest in preparing bulk crystal materials showing large transparency domain,

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Section: Introductionmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Organic Semiconductors for Non-Linear Optical Applications

Stănculescu¹,

Stanculescu²

2015

Optoelectronics - Materials and Devices

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“…The quality of the growing crystals can be controlled by accurately controlling the temperature distribution both in melt and crystal. Previous studies offered a possibility to control the position and shape of the solid‐liquid interface by controlling the position of the growth ampoule in the heater. In the first stage was solved the steady‐state heat transport model equation and in the second stage was considered the pseudo‐transient heat transfer in the central zone of the furnace .…”

Section: Resultsmentioning

confidence: 99%

Effect of heavy ions irradiation on the properties of benzil crystals

Stanculescu

Socol

Matei

et al. 2017

Crystal Research and Technology

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Thick slices mechanically polished cut from a pure benzil ingot grown from melt in a modified Bridgman-Stockbarger configuration were irradiated with Ni ions having a specific energy of 11.4 MeV/u at different fluences. The effect of radiation on the properties of bulk benzil has been investigated. The chemical structure was not substantially affected as shown by infrared spectrum. The changes induced on the disorder degree have been evaluated from the Urbach law and X Ray Diffraction measurements. The morphology and surface topography have been analyzed emphasising a decrease in the size of granules and an increase in the surface roughness by irradiation. No effect of irradiation on the photoluminescence emission and optical nonlinear properties has been evidenced. These results recommend benzil as candidate for applications in space technology.

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“…Fu and Wilcox [21] showed a triple zone model through adding an adiabatic zone between the heating and cooling zones of the furnace, which flattened isotherms in the interface region and decreased the sensitivity of the interface shape to perturbations. Based on above basic models, the effect of thermal diffusivities of the materials on solid-liquid interface morphology was researched by numerical method, and some numerical solutions of certain materials and/ or certain furnaces were obtained [22][23][24][25][26][27][28]. Several analytical studies were made as well [14,[29][30][31].…”

Section: Introductionmentioning

confidence: 99%