CHEMISTRY GLOSSARY

cubic crystal system    →   kubični kristalni sustav

Cubic crystal system is also known as the isometric system. The Isometric crystal system characterizes itself by its three equivalent crystallographic axes perpendicular to each other.

lattice constants    →   konstante kristalne rešetke

Lattice constants are parameters specifying the dimensions of a unit cell in a crystal lattice, specifically the lengths of the cell edges and the angles between them.

lattice energy    →   energija kristalne rešetke

Lattice energy is the energy per ion pair required to separate completely the ions in a crystal lattice at a temperature of absolute zero.

bcc    →   bcc

bcc is abbreviation for body-centered cubic lattice.

fcc    →   fcc

fcc is abbreviation for face-centered cubic lattice.

actinium    →   aktinij

Actinium was discovered by André Debierne (France) in 1899. The origin of the name comes from the Greek word aktinos meaning ray. It is heavy, silvery-white, very radioactive metal. Reacts with water. Glows in the dark. Actinium is extremely rare, found in all uranium ores. Usually obtained by treating radium with neutrons in a reactor.

ccp    →   ccp

ccp is abbreviation for cubic close-packed structure.

Bragg angle    →   Braggov kut

Bragg angle (Θ) is the angle between an incident X-ray beam and a set of crystal planes for which the secondary radiation displays maximum intensity as a result of constructive interference. British physicist Sir William Henry Bragg and his son Sir William Lawrence Bragg developed a simple relation for scattering angles, now call Bragg’s law.

which relates the angle θ between a crystal plane and the diffracted X-ray beam, the wavelength λ of the x-rays, the crystal plane spacing d, and the diffraction order n (any integer).

The diffraction experiment as presently considered is intended to provide quantitative information on the lattice constant and shape characteristics of the unit cell.

element    →   element

Element is a substance that cannot be decomposed into simpler substances. In an element, all the atoms have the same number of protons or electrons, although the number of neutrons my vary.

elementary substance    →   elementarna tvar

Elementary substance is a simple and pure substance which can not be, by chemistry methods, decomposed further into simpler substances.