Single chemical vapor transport

Shibata, T. Muranushi, Y. Miura, T. Kishi, T. 1991. Electrical characterization of 2H-SnS2 single crystals synthesized by the low temperature chemical vapor transport method. J. Phys. Chem. Solids 52 551-553. 

FIGURE 10 Raman spectra of Mo02 as an example of a single-phase oxide as obtained by chemical vapor transport excited at three different frequencies, 1064, 244, and 632 nm (top to bottom) based on Blume, 2001, PhD Thesis, TU Berlin. 

Single-crystalline LaBr3 was also prepared by chemical vapor transport with Al2Br6 (Kramer et al. 1989). In this process, as with AljClg, AljBrg reacts with La203 in a sealed tube under vacuum. When reaction is complete, the tube is moved to a two zone... 

One of the reports of dielectric functions of ZnO is that by Ashkenov et al. [135] who characterized thin films grown by pulsed laser deposition on c-plane sapphire and a single-crystalline sample grown by seeded chemical vapor transport method. The static dielectric constant was obtained from infrared spectroscopic ellipsometry measurements. The high-frequency dielectric constant was calculated through the Lyddane-Sachs-Teller (LST) relation, (Equation 1.31), using the static constant and the TO- and LO-phonon mode frequencies. The results are compared with the data from some of the previous studies in Table 3.8. 

Almost every conceivable solid compound can be made from the gas phase by chemical reactions between gases. The synthesis of single crystal by vapor transport is the subject of Section 8.4.1. The preparation of powders, layers, and fibers from gaseous precursors is dealt with in Section 8.4.2-S.4.4. The following four methods are described. 

Chemical vapor-phase transport is one of the earliest methods developed for the synthesis of new materials [19-26]. The method can also be used for the growth of high-quality single crystals or for the purification of solid-state compounds. The method has been used to synthesize a wide range of LMCs. 

The assessment of health effects due to exposure to the total petroleum hydrocarbons requires much more detailed information than what is provided by a single total petroleum hydrocarbon value. More detailed physical and chemical properties and analytical information on the total petroleum hydrocarbons fraction and its components are required. Indeed, a critical aspect of assessing the toxic effects of the total petroleum hydrocarbons is the measurement of the compounds, and the first task is to appreciate the origin of the various fractions (compounds) of the total petroleum hydrocarbons. Transport fractions are determined by several chemical and physical properties (i.e., solubility, vapor pressure, and propensity to bind with soil and organic particles). These properties are the basis of measures of teachability and volatility of individual hydrocarbons and transport fractions (Chapters 8, 9, and 10). 

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