Materials Literature
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Examples are given of recent abuses or debatable applications of the R-factor ratio test (\cal R) for the assignment of absolute configuration, and it is shown that some of the enhanced ratios that have been used do not necessarily imply a statistically significant reduction in α, the probability of making a wrong ass…
A complete list of (3 + 1)-dimensional superspace groups is presented. These groups describe the symmetry of incommensurate crystal structures with a one-dimensional modulation. A short discussion is given of applications. Extinction rules and Bravais types are tabulated in order to facilitate the determination of the…
"Experimental High-resolution Electron Microscopy." Optica Acta: International Journal of Optics, 28(9), p. 1173
The new edition of this practical microscopy guide includes additional material on high-resolution images of periodic structures and associated techniques. It provides both a view of the fundamental principles of electron microscopy and detailed practical information needed to record the images. Various theoretical re…
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This review deals with the following subjects: general characteristics of TL materials (including: LiF; Li 2 B 4 O 7 ; BeO); TL dose response and TL models (including: dependence of f(D) on impurity composition; supralinearity of individual glow peaks); ionising radiation dosimetry (including: dose response; cavity th…
Equilibrium electrical conductivity data for large‐grained, poly crystalline, undoped BaTiO 3 , as a function of temperature, 750° to 1000°C, and oxygen partial pressure, 10 −20 < P O2 <10 −1 MPa, were quantitatively fit to a defect model involving only doubly ionized oxygen vacancies, electrons, holes, and acci…
The crystallization and melting of adsorbed water on cellulose samples such as cotton, kapok, linen, jute, various rayons, and wood cellulose have been studied using a differential scanning calorimeter (DSC). Two exothermic peaks of crystallization of adsorbed water on the cellulose samples are observed. One is a shar…
Recent developments in thin film technology have made possible the construction of multilayered thin film structures that act as efficient Bragg diffractors for x rays and extreme ultraviolet (EUV) radiation. These structures (which we term layered synthetic microstructures or LSMs) are analogous to multilayer interfe…
An examination is made of the sharp‐indentation technique of strength‐test precracking for toughness evaluation. The experimental approach follows that proposed by other workers but the theoretical analysis contains one vital new feature; the residual‐stress term discussed in Part I of this study is now introduced exp…
An experimental study was made of the parameters and mechanism of the quenching of the luminescence of rare-earth ions by hydroxyl groups. This was done for nine transitions. The permissible concentration of the OH groups were found for laser glasses intended for different applications.
KDy(MoO 4 ) 2 is known to undergo a structural phase transition at 14.3K. Spectroscopic and magnetic studies of the behaviour of this compound at low temperatures have revealed some striking properties which suggest that the phase transition is of the Jahn-Teller type and that ordering occurs in an antiferrodistortive…
A theory is formulated that explains the observed bond-length change in graphite intercalation compounds in terms of the charge transfer $f$. The values of $f$ obtained via the bond-length changes are in good agreement with those derived with other methods. The present analysis also provides information on the electro…
The 0.82 eV intracentre transition of Cr 2+ ( 5 T 2 to 5 E) in GaAs is observed as a very sharp peak in the low-temperature photoconductivity response. The dependence of the photoconductivity on temperature and electric field is discussed and a comparison is made with the corresponding line in absorption. The results…
The magnetic structure of Ni 0.92 Zn 0.08 Br 2 has been studied by single-crystal neutron diffraction as a function of temperature down to 4.2K and in magnetic fields along (110) up to 3 T. From T N =48.0+or-0.5K to T IC =21.0+or-0.5K the magnetic structure is a collinear easy-plane metamagnetic one like NiCl 2 . Belo…