lutetium tantalate
... that lutetium tantalate (LuTaO4) is the densest known stable white material and is therefore an ideal material for X-ray phosphors?
... that <b id="mwHA"><a href="./Lutetium_tantalate" id="mwHQ" rel="mw:WikiLink" title="Lutetium tantalate">lutetium tantalate</a></b> (<a href="./Lutetium" id="mwHg" rel="mw:WikiLink" title="Lutetium">Lu</a><a href="./Tantalum" id="mwHw" rel="mw:WikiLink" title="Tantalum">Ta</a><a href="./Oxygen" id="mwIA" rel="mw:WikiLink" title="Oxygen">O<sub id="mwIQ">4</sub></a>) <i id="mwIg">(<a href="./Crystal_structure" id="mwIw" rel="mw:WikiLink" title="Crystal structure">crystal structure</a> pictured)</i> is the <a href="./Density" id="mwJA" rel="mw:WikiLink" title="Density">densest</a> known stable white material and is therefore an ideal material for <a href="./X-ray" id="mwJQ" rel="mw:WikiLink" title="X-ray">X-ray</a> <a class="mw-redirect" href="./Phosphors" id="mwJg" rel="mw:WikiLink" title="Phosphors">phosphors</a>?