 In 2017 it was suggested that undiscovered superhard materials (e.g.critically doped beta-titanium Au) might be a candidate for a new superconductor with Tc, substantially higher than HgBaCuO (138 K), possibly up to 233 K, which would be higher even than H2S.A lot of research suggests that additionally nickel could replace copper in some perovskites, offering another route to room temperature.