Table 2.

Parameters of the crystallographic unit cell, measured by X-ray in the B_1Rev phase for several compounds at selected temperatures, T.

	T / °C	a / Å	b / Å	γ / °
IVb	150	174.2	47.5	91.5
	140	200.0	47.8	91.0
	130	234.3	48.2	90.8
	120	283.8	48.5	91.0
	110	370.0	48.8	91.8
Vb	162	142.6	48.2	96.5
	150	139.6	48.6	91.9
	140	147.6	48.8	90.7
	130	158.6	49.1	91.1
	120	171.6	49.3	91.4
VIb	126	130.2	48.9	95.9
	122	134.4	49.1	95.8
	118	140.1	49.3	95.6
	114	147.5	49.5	95.1
	110	156.1	49.7	94.7
	106	166.1	50.0	94.3