Materials Literature
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The influence of hydrostatic pressure on the electrical resistivity \ensuremath{\rho} and ferromagnetic transition temperature ${\mathit{T}}_{\mathit{c}}$ of ${\mathrm{La}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Ca}}_{\mathit{x}}$${\mathrm{MnO}}_{3}$ is presented for x=0.21, 0.33, and 0.40. Pressure strongly d…
The effects of Bi/Ta and Sr/Ta mole ratios on ferroelectric properties of Sr x Bi y Ta 2 O z [ SBIT( x / y /2.0); 0.7≤ x ≤1.0, 2.0≤ y ≤2.6] thin-film capacitors were investigated. The SBIT films were grown by the sol-gel method using a spin-on coating on Pt/Ta/SiO 2 /Si and Pt/Ti/SiO 2 /Si substrates. The films were a…
The paper presents the state of the art in cements and concretes with alkaline-activated slag. Characteristics and properties of these materials are given. Special emphasis is made on those scientific and technical aspects which remain unsolved and which, therefore, call for further research.
This article review the state of the art on the effect of the joint incorporation of fluorides and sulfates to the cement crudes. This incorporation may be carried out partially replacing the traditional crudes, thus obtaining a new cement produced with a considerable energy saving and with advantageous characteristic…
With the present study, the necessity of carrying out tests to select the most suitable restoration treatment is remarked. Showing how the results obtained evidence the products behaviour, although knowing and evaluating limitations due to laboratory tests, different to real conditions.
The characteristics related to water absorption of some important stones very used in the southern of Spain were tested before and after the application of diverse commercial protective treatments, including the application of diverse dilutions and the correlative application of two complementary products. Some consid…
The weight increases of nylon-6,6 and glass-filled nylon-6,6 after 120 days exposure at 100% and 43% relative humidities were measured. The resultant mechanical properties of nylons were evaluated. Moisture absorption was seen to affect several mechanical properties. Specifically, an increase in moisture absorption re…
Electrically conducting composite films have been prepared from the polymer solution of conducting poly o‐phenylenediamine (PoPD) and nonconducting polyvinyl alcohol (PVA). This composite film showed a very low value of the percolation threshold (0.1 volume percent of the PoPD content) where the conductivity rose shar…
The discharge and charge performance of polyaniline which has a fibrous morphology was investigated from microscopic current density and anion diffusion time constant measurements. The microscopic discharge current density is calculated from the radius of the polyaniline fibril, assuming the true electrode surface are…
Abstract The definition of ‘clay’ was first formalized in 1546 by Agricola. It has been revised many times since, although the fundamentals involving plasticity, particle size, and hardening on firing were retained by most. For an exhaustive account of the history of the definition to 1963, the reader is referred to M…