"bz_k+": bz_k+.xyz "bz_li+": bz_li+.xyz "bz_na+": bz_na+.xyz "bz": bz.xyz "k2": k2.xyz "k8": k8.xyz "k+": k+.xyz "li2": li2.xyz "li8": li8.xyz "li+": li+.xyz "na2": na2.xyz "na8": na8.xyz "na+": na+.xyz