High-k oxide

Robertson, J., Electronic Structure and Band Offsets in High-K Oxides, IWGI 2001, Tokio, pp. 76-77. 

The ongoing work on the development of high-K oxide TiAlOx has been focused on those issues, and it is hoped that they will not hinder the application of this multifunctional material. 

The basic flow sheet for the flotation-concentration of nonsulfide minerals is essentially the same as that for treating sulfides but the family of reagents used is different. The reagents utilized for nonsulfide mineral concentrations by flotation are usually fatty acids or their salts (RCOOH, RCOOM), sulfonates (RSO M), sulfates (RSO M), where M is usually Na or K, and R represents a linear, branched, or cycHc hydrocarbon chain and amines [R2N(R)3]A where R and R are hydrocarbon chains and A is an anion such as Cl or Br . Collectors for most nonsulfides can be selected on the basis of their isoelectric points. Thus at pH > pH p cationic surfactants are suitable collectors whereas at lower pH values anion-type collectors are selected as illustrated in Figure 10 (28). Figure 13 shows an iron ore flotation flow sheet as a representative of high volume oxide flotation practice. 

Kofstad, P., High-Temperature Oxidation of Metals, John Wiley, New York (1966). Lawless, K. R., The Oxidation of Metals , Rep. Prog. Phys. 37, 231 (1974)... 

Structural binder A wide range of applications in electronics makes use of the plastics as a structural binder to hold active materials. For example, a plastic such as polyvinylidene fluoride is filled with an electroluminescent phosphor to form the dielectric element in electroluminescent lamps. Plastics are loaded with barium titanate and other high dielectric powders to make slugs for high K capacitors. The cores in high frequency transformers are made using iron and iron oxide powders bonded with a plastic and molded to form the magnetic core. 

Hawley, Glossary of Chemical Terms , Van-Nostrand-Reinhold,NY (1976), 217 Addnl Refs 1) K.S. Warren, Study Nitrates of Polyhydric Alcohols as Explosives , PATR 1103 (1941) la) D.B. Bright et al, Development of Polyol Prepolymers Containing High Energy Oxidizing Groups , Report No S-13843, Contract AF 04(611>5690, Shed Devel Co, Emeryville (1961) (limited distribution) 2) A.D. McElroy, Basic Approach to Incorporation of NP Propellants , Rept No RPL TDR 6448, Contract AF 04(611)-9059, Callery Chem Co, Phlla (1964) 3)... 

Thermally, alkylperoxy (RO2 ) radicals can become unstable as temperatures approach 600 K, since equilibrium would favor the alkyl radical and O2 as reactants. As temperatures increase further, high temperature oxidation mechanisms will begin to prevail. 

Christe, K. O., US Pat. 4 108 965, 1978 This high energy oxidant is useful in propellants. 

Complete mechanisms for the high temperature oxidation of propane and larger hydrocarbons are available in the literature [e.g., Wamatz, J., Proc. Combust. Inst., 24, 553-579. (1992), and Ranzi, E., Sogaro, A., Gaffuri, R, Pennati, G., Westbrook, C. K., and Pitz, W. J., Combust. Flame, 99, 201 (1994)]. Because of the space limitations, only selected reactions for propane oxidation are presented in Table C7. 

The discussion of potential benefits and drawbacks of using high-k dielectrics as a gate oxide for power SiC UMOS transistors has been made in several publications [8, 10, 11]. A comparative analysis of different insulating materials suitable as gate... 

A serious potential problem related to the use of high-k gate dielectrics in SiC power MOSEETs can be encountered due to the much smaller (sometimes-negative) conduction band offsets between SiC and high-k metal oxides compared with silicon dioxide (see Table 5.1). Time-dependent dielectric breakdown (TDDB) and hot... 

Gloom for Oxide Superconductors Dismayed at the progress through the years, even with the most promising room-temperature metallic, binary oxides, many scientists abandoned the search for new high temperature oxide superconductors. Also, it should be mentioned that a deep-rooted prejudice had developed which claimed that the BCS theory had imposed a maximum transition temperature limit of 25 K for all superconducting materials, and that this temperature had already been achieved in certain alloys of niobium. Some scientists, however, were steadfast in their determination to break this barrier, optimistic in their outlook, and they continued their search for this unusual phenomenon in other metallic oxide systems. 

A Tripled-Perovskite — Relationship to the New High Tc Oxide Superconductor A tripled cell for the perovskite structure is shown in Figure 33. This structure is closely related to that of the new 90 K superconductor in the following way. The structure of the superconductor can be derived from a highly anion-defect, perovs-kite-type structure. The composition can be obtained as follows. 

Tanaka, S., Fukushima, N., Niu, H., and Ando, K. (1990). Bond-valence-sum study on possible candidates for High-Tc oxide superconductors. Jap. J. Appl. Phys. 29, L1987-90. 

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