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Beryllium phosphide is an ionic compound consisting of beryllium cations (Be2+) and phosphate ions. It is also known as Be3(PO4)2.
The name of the cations in beryllium phosphate, Be2+, comes from the periodic table. The cations of metals in Groups 1 and 2 have the same names.
Be2+ can have a positive charge, and the phosphate ion has a negative charge. The ionic ratio of the two cations is 2:1. This is called the phosphorus content of beryllium phosphate.
When the phosphorus content of a beryllium phosphide is compared to the number of atoms of the cation, a molar mass is calculated. The molar mass is the percentage of each cation by weight.
A mole of beryllium phosphide contains 0.436 moles of phosphorus. This is because the formula for beryllium phosphide includes both phosphorus and the cation of beryllium, which are each a mole.
The molar mass of the cation of beryllium, Be2+, is 3.33 g/mol. This is because the cation of beryllium is in the first column of the periodic table.
Beryllium has a large scattering cross section for high-energy neutrons, about 6 barns. This makes it a desirable neutron reflector and moderator.
It has a low atomic weight and is highly transparent to X-rays, making it an excellent window material for X-ray equipment and particle detectors. It is also useful in aerospace applications because of its high flexural rigidity and thermal stability.
However, it has a few disadvantages. It is expensive and has poor ductility, toxicity and crystallite growth. It is also susceptible to swelling under irradiation at high temperatures. This is a problem in some test reactors and can cause bowing, cracking, and swelling in reflector blocks subjected to fast neutron fluences in the range of 4-10 x 1021 nvt.
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