Temperature Dependence of the Raman Frequency of an Internal Mode for SiO₂-Moganite Close to the α-β Transition

Table 1

Values of the coefficients for the experimental unit-cell volume [13] according to (3) for the α-β phases of moganite. The 𝑉₁ value which was obtained by extrapolating the 𝑉(𝑇) data [13] at around 𝑇=303 K is also given here.

V (Å^3)	a (Å^3)	𝑏×10^−2 (Å^3/K)	−𝑐×10^−6 (Å^3/K^2)	𝑉1 (Å^3)	Temperature interval (K)
α-β phase	111.71	1.09	6.61	114.41	297.5<𝑇<868.3