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

Table 2

Values of the coefficients from the fit of (4) to the experimental data [13] for heating and cooling cycles for the vibrational frequency of 501 cm⁻¹ in the α-β phases of moganite.

Vibrational frequency; ω (501 cm^−1)	𝑎0 (cm^−1)	−𝑎1×10^−2 (cm^−1/K)	𝑎2×10^−5 (cm^−1/K^2)	Temperature interval (K)
Heating	507.0	2.57	1.29	301.6<𝑇<873.8
Cooling	506.84	2.63	1.39	303.5<𝑇<875.3