High Temperature Specific Heat of BSO Crystals

The heat capacity of bismuth silicates

“…The observed difference between DTA [14] and DSC [13,15,present work] experimental heat capacity data of BSO-(6:1) (Fig. 2) are due to common lower sensitivity of DTA method.…”

“…2 were compared with the data of Licea and Ioanid [14] obtained by DTA measurements, DSC data of Suleimenova and Skorikov [13] and the results of Denisova et al [15]. Such comparison of the present and literature single crystal heat capacity results obtained by DSC method shows their average deviation lower than 1%.…”

“…2) the significant ~15% difference between DSC single crystal data and DTA data (polycrystalline sample) of Licea and Ioanid [14].…”

“…The undoped BSO crystals are the solids with polyatomic basis, therefore, the contributions to C p (T) due to acoustic and optical phonons should be considered in part of theoretical approximation [14]. The introduction of Debye-Einstein approximation [21] describes an approximation referring to real vibrational spectrum of acoustic and optical branches.…”

“…Some DTA data (LINSEIS 62 apparatus) on temperature dependence of the isobaric heat capacity of undoped BSO-(6:1) crystals in the temperature range between 300 and 900 K were also reported by Licea and Ioanid [14]. They prepared their samples by grinding of oxides at a temperature 1274 K. Isobaric heat capacity of BSO-(6:1) crystals was determined in comparison with Al 2 O 3 reference sample using the dependence ΔT = f(T) of DTA curve.…”