Yttrium Borides
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Yttrium boride refers to a crystalline material composed of different proportions of yttrium and boron, such as YB2, YB4, YB6, YB12, YB25, YB50 and YB66. They are all dark, hard solids having high melting temperatures. The most common form is the yttrium hexaboride YB6. It exhibits superconductivity at relatively high temperature of 8.4 K and, similar to LaB6, is an electron cathode. Another remarkable yttrium boride is YB66. It has large lattice constant (2.344 nm),…mehr

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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Yttrium boride refers to a crystalline material composed of different proportions of yttrium and boron, such as YB2, YB4, YB6, YB12, YB25, YB50 and YB66. They are all dark, hard solids having high melting temperatures. The most common form is the yttrium hexaboride YB6. It exhibits superconductivity at relatively high temperature of 8.4 K and, similar to LaB6, is an electron cathode. Another remarkable yttrium boride is YB66. It has large lattice constant (2.344 nm), high thermal and mechanical stability, and therefore is used as a diffraction grating for soft synchrotron radiation (1-2 keV). Yttrium diboride has the same hexagonal crystal structure as aluminium diboride and magnesium diboride - an important superconducting material. In this structure, the boron atoms form graphite like sheets with yttrium atoms between them. YB2 crystals are unstable tomoderate heating in air - they start oxidizing at 400 °C and completely oxidize at 800 °C. YB2 melts at ~2220 °C.