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BeH 2 is usually formed as an amorphous white solid, but a hexagonal crystalline form with a higher density (~0.78 g/cm 3) was reported, [7] prepared by heating amorphous BeH 2 under pressure, with 0.5-2.5% LiH as a catalyst. Subunit of structure of BeH 2. Each Be is tetrahedral and each H is doubly bridging. [8]
The other form resembles zinc iodide with interconnected adamantane-like cages. [4] In contrast, BeF 2 is a 3-dimensional polymer, with a structure akin to that of quartz. In the gas phase, BeCl 2 exists both as a linear monomer and a bridged dimer with two bridging chlorine atoms where the beryllium atom is 3-coordinate. [5]
In the solid state, the hydroxyl group may deprotonate: a hexamer, [(())], was isolated long ago. [ 54 ] [ 55 ] Aromatic hydroxy ligands (i.e. phenols ) form relatively strong complexes. For example, log K 1 and log K 2 values of 12.2 and 9.3 have been reported for complexes with tiron .
Beryllium oxide (BeO), also known as beryllia, is an inorganic compound with the formula BeO. This colourless solid is an electrical insulator with a higher thermal conductivity than any other non-metal except diamond, and exceeds that of most metals. [12]
The propensity for any two substances to form a solid solution is a complicated matter involving the chemical, crystallographic, and quantum properties of the substances in question. Substitutional solid solutions, in accordance with the Hume-Rothery rules, may form if the solute and solvent have: Similar atomic radii (15% or less difference)
Beryllium fluoride has distinctive optical properties. In the form of fluoroberyllate glass, it has the lowest refractive index for a solid at room temperature of 1.275. Its dispersive power is the lowest for a solid at 0.0093, and the nonlinear coefficient is also the lowest at 2 × 10 −14.
Beryllium is an exception: It does not react with water or steam unless at very high temperatures, [10] and its halides are covalent. If beryllium did form compounds with an ionization state of +2, it would polarize electron clouds that are near it very strongly and would cause extensive orbital overlap, since
Solid: A solid holds a definite shape and volume without the need of a container. The particles are held very close to each other. Amorphous solid: A solid in which there is no far-range order of the positions of the atoms. Crystalline solid: A solid in which atoms, molecules, or ions are packed in regular order.