Materials Literature
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A model structure for an annealed silica surface was obtained through the molecular dynamics simulation technique employing three-body interaction potentials. Nonbridging oxygen and edge-sharing tetrahedra were found to form on the oxygen-terminated surface with three-coordinated silicon, three-coordinated oxygen, and…
Liquid crystalline behavior and molecular miscibility – in amorphous discoid polymers, and mixtures thereof, can both be induced by CT interactions with a low molecular disk-shaped electron acceptor such as trinitrofluorenone (TNF). The properties of these induced discotic phases can be varied easily and over a wide r…
The structure and operation of ferroelectric thin-film memory capacitors for use in nonvolatile random-access memory applications are described. The search for the ideal ferroelectric material for ferro-electronic memory applications is examined. Possible military and nonmilitary applications of these memories are not…
In the system SrO ‐ Al 2 O 3 a new compound was discovered with composition 2 SrO · 3 Al 2 O 3 (SAL); its structure is related to the one of 4 SrO · 7 Al 2 O 3 (SAE). The aluminate 1.29 ( Ba , Ca ) O , 6 Al 2 O 3 (BAL) belongs to the β‐alumina type compounds and is closely related to BaMgAl 10 O 17 (BAM). The compound…
Infrared spectroscopy was employed to characterize thermal SiO2 layers down to 15 nm thickness. From these measurements, performed in transmission mode under a 30° angle of incidence, we obtained a multiple resonance structure on the high-energy side of the main Si-O stretching vibration at 1075 cm−1. Aside from a lon…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry and physics of the novel molecular-based compound exhibiting a spontaneous magnetization below Tc = 14 K, MnCu(obbz).cntdot.1H2O (obbz = oxamidobis(benzoato)). Comparison with the antiferromagnet MnCu(obbz).cntdot.5H2O. Crystal structure and magnetic properties of…
Homogeneous nucleation of diamond powder is reported. The experiments were performed in a low-pressure microwave-plasma reactor. The deposits were collected downstream of the reaction zone and subjected to wet oxidation to remove nondiamond carbons. The residues were analyzed by optical and electron microscopy, electr…
Growth of high quality crystals has played an important role in sophisticated, modern- day technologies and in recent advances in physics. It has also provided examples in the study of self-organizing dissipative structures. This paper reviews the science of crystal growth and discusses recent data, particularly with…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of a soluble oxide inclusion complex, [CH3CN.cntnd.(V12O324-)]V. W. Day, W. G. Klemperer, and O. M. YaghiCite this: J. Am. Chem. Soc. 1989, 111, 15, 5959–5961Publication Date (Print):July 1, 1989Publication History Published online1 May 2002Pub…
The conductivity and Seebeck coefficient of the perovskite‐type oxides La 1 − x Sr x CoO 3 − δ ( x = 0 – 0.7 ) were measured in 10 – 5 − 1 atm O 2 gas at temperatures 25°–1000°C. The results are discussed in relation to the lattice‐parameter and oxygen non‐stoichiometry. Close relationships were found between the temp…
The birefringent property of obliquely deposited metal oxides was studied with a view to applying it to optical retardation plates. By finding favorable conditions to form transparent films of large retardation and low opacity, we developed homogeneous quarterwave plates with a bilayered structure 60 x 250 mm in size…
Nonresonant second-order microscopic nonlinear-optical susceptibilities (β) of a series of organic conjugated π-electron molecules were measured, using dc-induced second-harmonicgeneration. This study confirms structure–property relationships that affect β, including the electronic properties of substituents, the leng…
Results of sliding wear tests on three alumina ceramics with different grain sizes are discussed in the light of crackresistance (R‐curve, or T‐curve) characteristics. The degree of wear increases abruptly after a critical sliding period, reflecting a transition from deformation‐controlled to fracture‐controlled sulfa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and electronic structures of conductive anion-radical salts, (2,5-R1R2-DCNQI)2Cu (DCNQI = N,N'-dicyanoquinonediimine; R1, R2 = CH3, CH3O, Cl, Br)Reizo Kato, Hayao Kobayashi, and Akiko KobayashiCite this: J. Am. Chem. Soc. 1989, 111, 14, 5224–5232Publication Date (Pri…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFunctionalized polypyrroles. New molecular materials for electrocatalysis and related applicationsAlain Deronzier and Jean Claude MoutetCite this: Acc. Chem. Res. 1989, 22, 7, 249–255Publication Date (Print):July 1, 1989Publication History Published online1 May 2002Published…
Abstract The results of an experimental study of the temperature ( T ) dependent dc conductivity σ dc , T ‐dependent thermoelectric power (TEP), and electron spin resonance in a new conducting polyethylenevinylacetate–polyoctylthiophene (EVAPOT) polymer blend doped with FeCl 3 are presented. For a POT content of 20 wt…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical Surface ScienceCite this: Anal. Chem. 1989, 61, 13, 814APublication Date (Print):July 1, 1989Publication History Published online30 May 2012Published inissue 1 July 1989https://doi.org/10.1021/ac00188a748RIGHTS & PERMISSIONSArticle Views23Altmetric-Citations-…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSinglet molecular oxygen (1.DELTA.gO2) formation upon irradiation of an oxygen (3.SIGMA.g-O2)-organic molecule charge-transfer absorption bandRodger D. Scurlock and Peter R. OgilbyCite this: J. Phys. Chem. 1989, 93, 14, 5493–5500Publication Date (Print):July 1, 1989Publicati…
We show that under compression on a Langmuir trough, a surfactant monolayer may have a mechanical instability similar to the buckling instability of a beam or a plate. In the buckled state, the wavelength of the surface undulations is the capillary length resulting from the balance between gravity and curvature energy…
A bismuth sodium titanate, (BiNa)1/2 TiO3 (BNT)-based solid solutions, (1−x) (BiNa)1/2TiO3 + x(a·SrTi03 +b·PbTiO3 +c·CaTiO3) (a + b + c = l), (BNTX [100x-100a/100b/100c]), were studied for their dielectric, piezoelectric and pyroelectric properties. X-ray diffraction data show that a rhombohedra1 (Fα-tetragonal (Fβ) p…