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Reference.org
Tantalum boride
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<p>Tantalum borides are compounds of <a href="/facts/Tantalum/VwaxMm33">tantalum</a> and <a href="/facts/Boron/Pmwgd7Mf">boron</a> most remarkable for their extreme <a href="/facts/Hardness/PtGn6E20">hardness</a>. </p>