Polycrystalline diamond compact including substantially single-phase polycrystalline diamond body and applications therefor

A polycrystalline diamond compact, comprising:

• a sintered substantially single-phase polycrystalline diamond body consisting essentially of bonded-together diamond grains exhibiting a morphology different than that of a polycrystalline diamond body formed by sintering diamond crystals, the sintered substantially single-phase polycrystalline diamond body including working surface and a porous interfacial surface positioned opposite the working surface;
• a substrate;
• and
• at least one polycrystalline diamond layer positioned between the sintered substantially single-phase polycrystalline diamond body and the substrate, the at least one polycrystalline diamond layer bonded to the porous interfacial surface of the substantially single-phase polycrystalline diamond body and the substrate.

A rotary drill bit, comprising:

• a bit body including a leading end structure configured to facilitate drilling a subterranean formation;
• and
• a plurality of polycrystalline diamond cutting elements mounted to the blades, at least one of the plurality of polycrystalline diamond cutting elements including:
• a sintered substantially single-phase polycrystalline diamond body consisting essentially of bonded-together diamond grains exhibiting a morphology different than that of a polycrystalline diamond body formed by sintering diamond crystals and the substantially single-phase polycrystalline diamond body includes substantially only one of carbon-12, carbon-13, or carbon-14;
• and
• a substrate bonded to the sintered substantially single-phase polycrystalline diamond body.