Thermodynamic properties of Ln 1−x Sr x CoO 3 (Ln = Pr, Nd, Sm and Dy)

Effect of Mo doping on thermodynamic properties of SrCoO3-δ

“…From Table 1, all compositions could form a stable perovskite structure, but the stability showed a trend to decrease slightly with increasing Mo doping. The cations-size disorder parameter ( 2 ) calculated on the lines of our previous work [2][3][4] is depicted in Table 1. The thermal properties, such as cohesive energy (), molecular force constant (f), Debye temperature ( D ), Reststrahlen frequency () and Gruneisen parameter () have been calculated and their values are listed in Table 2.…”

“…The formalism of Modified Rigid Ion Model (MRIM) has been derived for the following effective interatomic potential [2][3][4].…”

“…The symbols involved are in it are the same as those defined in our earlier papers [2][3][4]. Here, k (k') denotes the positive (negative) ions and the sum is taken over all the ions (k, k') and the β i kk′ is the Pauling coefficient [5] given by:…”

“…here p is the number of atoms in one formula unit, N is the Avogadro number, k B the Boltzmann constant, R is the universal gas constant and θ D is Debye temperature. The cohesive energy for SrCo 1-x Mo x O 3- is calculated using equation (1) and other thermal properties such as the Debye temperature ( D ), Reststrahlen frequency (), molecular force constant (f), Gruneisen parameter (), and thermal expansion () are computed using the expression given in our earlier publication [2][3][4]. The results are thus obtained and discussed below.…”

“…Recently we have successfully described the thermal properties of some perovskite manganites and other compounds over a fairly wide range of temperatures [2][3][4] by means of MRIM. Motivated by the unusual thermodynamic behavior and spin transitions of orthocobaltate, we have applied modified rigid ion model (MRIM) and successfully explored the specific heat (C), thermal expansion (), cohesive energy (), molecular force constatnt (f), Reststrahlen frequency (), Debye temperature ( D ) and Gruneisen parameter () of the SrCo 1-x Mo x O 3- perovskites.…”