New crystal data (neutron) for phase II rubidium nitrate at 513 K

Indexed neutron powder diffraction data of phase II RbNO₃ indicate a body-centred cubic unit cell [a = 8.84(3) Å at T = 513 K, V = 690.1(52) ų, Z = 8, D_x = 2.84(2) Mg m⁻³, λ = 1.083 Å, possible space groups include I23, I2₁3, Im3, I432, I3m or Im3m] in preference to the previously reported tetragonal cell {a = 6.19, c = 8.74 Å, Z = 4 [Brown & McLaren (1962). Acta Cryst. 15, 974–976]}, or trigonal cell {a ≃ 5.48, c ≃ 10.71 Å, Z = 3 [Ahtee & Hewat (1980). Phys. Status Solidi A, 58, 525–531]}.