Materials Literature
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Pyroelectric detectors offer major advantages in terms of cost and ease-of-operation over cooled photon detectors of long wavelength infra-red radiation. This paper reviews the requirements of a pyroelectric material to maximise its effectiveness in different types of detector and compares the properties of ferroelect…
Lead zirconate titanate (PZT) thin films with a composition near the morphotropic phase boundary (Zr/Ti = 53/47) were fabricated by spin deposition of an alkoxide‐derived solution and annealed at 650°C for 30 min. A complex microstructure is observed in which micrometer‐scale rosettes of the desired perovskite phase a…
SUMMARY The environmental scanning electron microscope (ESEM) allows the examination of specimens in a gaseous environment. It is based on an integration of efficient differential pumping with a new design of electron optics and detection systems. Backscattered, cathodoluminescence and X‐ray detectors can be designed…
A detailed thermodynamical analysis of commensurate and incommensurate magnetic phases in localized magnetic systems within a mean-field theory is presented. Interesting results are obtained concerning the specific heat of amplitude-modulated magnetic structures: In particular, the specific-heat discontinuity at the o…
Monte Carlo computer simulation has been used to study water confined between the layers of 2:1 clay minerals. The model systems are based on natural Mg and Na smectites. The simulation cells contain one clay layer, 64 water molecules and four magnesium or eight sodium interlayer cations. These atoms and molecules int…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew synthetic route to the hydridospherosiloxanes Oh-H8Si8O12 and D5h-H10Si10O15Pradyot A. AgaskarCite this: Inorg. Chem. 1991, 30, 13, 2707–2708Publication Date (Print):June 1, 1991Publication History Published online1 May 2002Published inissue 1 June 1991https://pubs.acs.o…
There is an hypothesis that the mechanism o f gypsum hydration and dehydration is performed through two simultaneous phenomena. In this study we try to clear up this phenomenon using chlorides as accelerators or a mixture of ethanol-methanol as retarders to carry out the gypsum setting. Natural Mexican gypsum samples…
The petrographical description and the values of some physical properties of three rocks used in the Architectonic Heritage of Catalonia (Spain) are presented. These rocks are known, in the field of the "building stones" as Sant Vicenç, El Figueró and Manresa stones. By means of accelerated ageing tests, their durabil…
The prevailing winds in the area, associated with an important rising damp are the main natural factors of deterioration that affect the Cathedral of Almería. Certain unfortunate maintenance Jobs carried out as well as the bombardments and machine-gunning on the building during the Civil War can be indicated as anthro…