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The vanadium atoms in the title anion form a spherical shell— “bulged” by As2O5 groups —around an enclosed H2O molecule. This was revealed by an X-ray structure analysis of the salt K6[As6V15O42(H2O)]ṁ8 H2O. The compound is very readily formed and crystallizes in the form of very large, brown rhombohedra.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPotential building blocks for molecular ferromagnets: [Mn12O12(O2CPh)16(H2O)4] with a S = 14 ground statePeter D. W. Boyd, Qiaoying. Li, John B. Vincent, Kirsten. Folting, Hsiu Rong. Chang, William E. Streib, John C. Huffman, George. Christou, and David N. HendricksonCite th…
The compounds [1,40 \n-bipyridine]-1,10 \n-diium [CuCl4] (1) and [1,40 \n-bipyridine]-1,10 \n-diium \n[CuBr4] (2) were prepared and their crystal structures and magnetic properties are reported. \nThe compounds are isomorphous and crystallize in the monoclinic space group C2/c. The cation \…
Version 1.1 of MISSYM is now available and the following new features have been added: a HELP facility to guide and caution the user; the input of a distance tolerance for axes and planes, and a separate tolerance for inversion centers and translations; the possibility of flagging atomic positions as `possibly disorde…
The ac field dependence of the polarization and strain responses of three different compositions of doped lead zirconate titanate ceramics were measured for samples in both the poled and the depoled states. The results indicate that a reversible domain wall excitation exists which contributes to the weak-signal respon…
Raman spectra of diamondlike amorphous carbon (a-C) films prepared under atmosphere with various hydrogen gas content have been measured as a function of excitation wavelength. The Raman spectral profiles vary with excitation wavelength depending on electronic absorption spectra associated with π-π* electronic transit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, characterization, and reactivity of oxomanganese(IV) porphyrin complexesJohn T. Groves and Michael K. SternCite this: J. Am. Chem. Soc. 1988, 110, 26, 8628–8638Publication Date (Print):December 1, 1988Publication History Published online1 May 2002Published inissue…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of isopolymetalate-pillared hydrotalcite via organic-anion-pillared precursorsMark A. DrezdzonCite this: Inorg. Chem. 1988, 27, 25, 4628–4632Publication Date (Print):December 1, 1988Publication History Published online1 May 2002Published inissue 1 December 1988http…
Gypsum is a relatively low-cost building material much abounding in our country. When it is put in contact with steel, it may produce high corrosion rates due to its pH value (close to 7). This work reports the results obtained in studying the corrosion rates of bare and galvanized steel in contact with gypsum and pla…
This part II A presents and discusses only the experimental results obtained employing 21,0 % SO3 in the selenitouse conglomerant-mixture cement P-1 (14,11 % C3A) or P-31 (7,62 % C3A) or PUZ-8 which more gypsum, respectively. These experimental results obtained thus with the parameters Δ L (%), [Δ L (%)/g cement] and…
The advances in laser technology have permitted the development of numerous applications, in particular diffraction spectrometry by laser beams for the determination of the distribution curve of the particle sizes of different materials; this permits one to obtain the distribution of particle size in both wet and dry…
The increase of active mineral admixtures consumption in contemporaneous cementiceous materials has stablished revision of some test methods. In the evaluation of blended cement durability, many accelerated tests of large application in portland cements become unvalid, because they don't allow to value the improvement…
Abstract Macromolecules intimately associated with the mineral phase of two species of scleractinian coral skeletons are extracted in different ways and partially characterized in some detail for the first time. They are shown to contain an assemblage of glycoproteins in which the protein moiety is rich in acidic amin…
A statistical model, based upon earlier models of Brown [J. Appl. Phys. 33, 3022 (1962)] and McIntyre [J. Phys. D 3, 1430 (1970)] has been developed to examine the magnetization reversal of domain-wall nucleation controlled permanent magnets such as sintered Fe-Nd-B and SmCo5. Using a Poisson distribution of the defec…