Magnesium electronic devices

The function of the spectrometer is to accept as much light from the source as possible and to isolate the required spectral lines. This may be impossible where there is a continuous spectrum in the same region as the analytical line for example, the magnesium line of 286.2 nm coincides with a hydroxyl band. In direct reading instruments, electronic devices may be used to supplement the resolution of the spectrometer by modulating the intensity of the analytical signal. In absorption and fluorescence the light source is modulated in emission the spectral line is scanned (816) or the sample flow modulated (M23). 

Alkaline earth metals The alkaline earth metals are in group 2. They are also highly reactive. Calcium (Ca) and magnesium (Mg), two minerals important for your health, are examples of alkaline earth metals. Because magnesium is solid and relatively light, it is used in the fabrication of electronic devices, such as the laptop shown in Figure 6.4. 

Figure 6.4 Because magnesium is light and strong, it is often used in the production of electronic devices. For instance, this laptop case is made of magnesium. 

Talc is a naturally occurring magnesium silicate which is finding broad application as a filler in polyolefins. Apparently, it provides a moderate flame retardant effect, but because talc is inexpensive, it is used as a partial substitute for more expensive flame retardants. Fumed silica is used as a filler in epoxy resins for the encapsulation of electronic devices at a relatively high loading, np to 80 to 90 wt%. Because of the relatively small amount of combnstible resin, this composition can be flame retarded by the addition of a very small amonnt of a conventional flame retardant. It is not clear if the silica contribnles to the flame retardancy by any mechanism other than heat dispersion. Nanodis-persed clay, which is one of the main topics of this book, is an alnminosiUcate. The mechanism of its flame retardant action is discnssed in other chapters of the book. 

Magnesium is one-third lighter than aluminum. It is widely used in alloys with zinc, silicon, copper, aluminum, and zirconium. Improvements in strength, vibration absorption, durability, resistance to corrosion, and weight savings are often achieved. Common applications are for automotive/tmck components, electronic devices, and aerospace. 

The low stability of the magnesium porphyrins has precluded most potential applications. Other metallotetrapyrroles have found industrial uses for oil desulfurization, as photoconducting agents in photocopiers, deodorants, germicides, optical computer disks, semiconductor devices, photovoltaic cells, optical and electrochemical sensing, and molecular electronic materials. A few scattered examples of the use of Mg porphyrins in nonlinear optical studies have appeared" and magnesium phthalocyanines have been used in a few studies as semiconductor or photovoltaic materials" " One of the few... 

The first single-layer PF-based PLED with polymer 1 as emitting layer was reported by Yoshino and coworkers [17]. For this device with ITO and magnesium-indium alloy (Mg In) as anode and cathode, respectively, its main EL emission peak locates at 470 nm, but no data on efficiency was given. However, the authors pointed out that electron injection is difficult because of the large energy barrier (1 eV) between 1 (LUMO 2.9 eV) and the Mg fii cathode (work function of Mg 3.9 eV), while the hole-injection barrier [0.2 eV, as estimated from the work function of ITO (5.5 eV) and the HOMO level of 1 (5.7 eV)] is relatively low as compared to the electron-injection barrier (1 eV). Bradley and coworkers reported that the device with PFO as emit-... 

High value metals, metallic compounds, and intermetaUics are used in functional applications, such as electronic, photovoltaic, magnetic and other electrooptic and electro-mechanical devices. Consumer goods, such as sporting equipment, vehicles, and appliances, employ many valuable metals. Common metals used for these applications include precious metals, copper, silicon, aluminum, magnesium, titanium, refractory metals, lanthanides, rare-earth metals, and alkaline-earths. 

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