Growth of benzil crystals by vertical dynamic gradient freeze technique in a transparent furnace

Lan, C.W.; Song, C.R.

doi:10.1016/s0022-0248(97)00204-2

Cited by 15 publications

(9 citation statements)

References 12 publications

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“…The amorphization process is less possible in our experiment because, for an energy of the incident ions beam of 0.66 GeV and a minimum thickness of the sample absorbing the energy of the ions corresponding to R p = 157 μm, the calculated increase in local temperature inside the individual track, (Δ T ), determined by uniform energy deposition is <5 °C. Δ T is given by the equation

E_{i o n s . b e a m} = V \cdot δ_{b e n z i l c r y s t a l} \cdot c_{b e n z i l c r y s t a l} \cdot Δ T

, where δ benzil cristal = 1.23 g/cm 3 , c benzil crystal = 1.169 Jg −1 K −1 and the volume of benzil affected by one Ni ion passage is approximated with a cylinder. Therefore we can suppose that benzil is not melted along the track.…”

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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E_{i o n s . b e a m} = V \cdot δ_{b e n z i l c r y s t a l} \cdot c_{b e n z i l c r y s t a l} \cdot Δ T

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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“…In the configuration mentioned above, most of the latent melting heat is removed from the growing crystal characterized by low thermal conductivity (e.g. 2.63 Â 10 -3 W cm À 1 1C [11]), which involves a longer time for solidification and, as a consequence, low macroscopic moving speed of the ampoule in the heater (which is estimated as the moving speed of growth interface) of 0.7-2.7 mm/h [9,11].…”

Section: Methodsmentioning

confidence: 99%

“…3b. Thermo-physical properties of interest are listed in Table 1: benzil and pyrex [15], quartz [16] and teflon [17].…”

Section: Global Modelling Of Heat Transfermentioning

confidence: 99%

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

Barvinschi

Stănculescu

Stanculescu

2011

Journal of Crystal Growth

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“…Correlating the thermal regime, moving speed of the ampoule, low thermal conductivity of organic materials (7:38 Â 10 À4 W cm À1 C À1 for molten benzil [13]) and the anisotropic growth speed we try to annihilate the supercooling effect, control the freezing mechanism of the molten mixture and the shape of the crystal-melt interface with the aim to avoid the growth of nonhomogeneous organic crystals favoured by the Bridgman-Stockbarger method [14].…”

Section: Experimental Methodsmentioning

confidence: 99%