For information on re-use, please refer to the publisher’s terms and conditions. This version is the author accepted manuscript. Type:Įstimation of standard molar entropy of cement hydrates and clinker mineralsĪn open access version is available from UCL Discovery In addition, this study reports the provisional estimates for the standard entropies of minerals ternesite and ye'elimite. Compute thermodynamic properties such as entropy, heat capacity or vapor pressure for a wide variety of chemicals. The results of this analysis show that the standard entropies and/or molar volumes (and in cases solubility products) of the following phases deserve closer scrutiny: meta-ettringite phases magnesium/aluminium layered double hydroxide solid solutions almost all iron-bearing monosulfate and hydrogarnet phases and several calcium silicate hydrate solid solution end-members. ![]() To this end, a simple but robust method is used in which the standard entropy of an inorganic solid is correlated to its formula unit volume via a linear equation. The standard state of a substance is an arbitrarily. The purpose of this study is to assess the reliability of standard entropies compiled in those datasets. Standard molar entropy is the amount of entropy one mole of substance has under its standard state. These are often (but not necessarily) chosen to be the standard temperature and pressure. This is further compounded by the controversies surrounding the entropy values reported in established thermodynamic datasets for cements. In chemistry, the standard molar entropy is the entropy content of one mole of pure substance at a standard state of pressure and any temperature of interest. ![]() It is not straightforward to experimentally measure the standard molar entropy of cement hydrates or clinker minerals. We observe the discrepancy when measured values, at \(T\), of entropies of reactions that involve \(A\) fail to agree with those calculated using the incorrect value of \(SoA\left(T\right)\). ![]() Ghazizadeh_PDFsam_Ghazizadeh_Manuscript - Entropy R1 Accepted.pdf The excess is the molar entropy of the imperfect crystal at absolute zero. Standard molar entropy The total (minimal) amount of entropy that 1 mole of a substance gains, as it is brought from 0K to the standard conditions is known.
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