Laser vapour phase synthesis of ceramic powders

Bauer, Robert A.; Schoonman, J.

doi:10.1007/978-94-011-0531-6_2

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“…4 A detailed overview of gas-phase combustion synthesis of particles was recently published by Wooldridge. 5 Laser-induced gas-phase reactions of chlorinated silanes at various reaction conditions are known to be suitable to produce high-quality ceramic particles, 6,7 which are smaller and more monodisperse compared to particles formed, for example, in flames. However, this technique is not really established, because it is less efficient and the details are not well understood, 2 so that further investigations are needed.…”

Section: Introductionmentioning

confidence: 99%

Laser Flash Photolysis of SiCl₄ at High Temperatures Based on Si- and Cl-Concentration Measurements

Kunz¹,

Roth²

1999

J. Phys. Chem. A

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Laser flash photolysis of SiCl4 at 193 nm was studied behind reflected shock waves at temperatures 1000 K ≤ T ≤ 2050 K and pressures between 1.4 and 1.8 bar. The atomic resonance absorption spectroscopy (ARAS) was applied for time-resolved measurements of Si- and Cl-atom concentrations in gas mixtures containing 10−100 ppm SiCl4 highly diluted in argon. The atoms formed during photolysis of SiCl4 were analyzed in terms of yields, defined as the fractions of the maximum atom concentration to the initial SiCl4 concentration behind the shock wave. At temperatures 1000 ≤ T ≤ 1510 K, Cl atoms were detected immediately after the laser flash. The Cl yield was found to be temperature dependent in the range between 0.1 and 2% of the initial SiCl4 concentration. Si atoms first occurred at temperatures T > 1750 K, when SiCl4 already has started to decompose. In contrast to Cl, the Si yield obtained correlates with both the temperature and the delay time between the shock-induced gas heating and the laser pulse. This effect was attributed to the photolysis of SiCl2, which is formed during the thermal decomposition of SiCl4. A reaction model including the thermal dissociation of SiCl4 and the photodissociation of SiCl2 is suggested and discussed, in which also reactions of Cl and Si atoms with SiCl4 are considered to describe the measured concentration profiles.

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Section: Introductionmentioning

confidence: 99%

Laser Flash Photolysis of SiCl₄ at High Temperatures Based on Si- and Cl-Concentration Measurements

Kunz¹,

Roth²

1999

J. Phys. Chem. A

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Laser vapour phase synthesis of ceramic powders

Cited by 1 publication

References 26 publications

Laser Flash Photolysis of SiCl₄ at High Temperatures Based on Si- and Cl-Concentration Measurements

Laser Flash Photolysis of SiCl₄ at High Temperatures Based on Si- and Cl-Concentration Measurements

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Laser vapour phase synthesis of ceramic powders

Cited by 1 publication

References 26 publications

Laser Flash Photolysis of SiCl4 at High Temperatures Based on Si- and Cl-Concentration Measurements

Laser Flash Photolysis of SiCl4 at High Temperatures Based on Si- and Cl-Concentration Measurements

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Laser Flash Photolysis of SiCl₄ at High Temperatures Based on Si- and Cl-Concentration Measurements

Laser Flash Photolysis of SiCl₄ at High Temperatures Based on Si- and Cl-Concentration Measurements