def METHOD_NAME(shannon_radius):
    """The lattice parameters of b2.
    Args:
        shannon_radius (list) : The radii of the a,b ions
    Returns:
       (tuple):
           float values of lattics constants and
           angles (a, b, c, alpha, beta, gamma)
    """
    limiting_factors = [
        2 * (shannon_radius[0] + shannon_radius[0]) / np.sqrt(3),
        2 * shannon_radius[1],
        2 * shannon_radius[0],
    ]
    a = max(limiting_factors)
    b = a
    c = a
    alpha = 90
    beta = 90
    gamma = 90
    return a, b, c, alpha, beta, gamma