+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

Heat capacities and entropies from 8 to 1000 K of langbeinite (K2Mg2(SO4)3), anhydrite (CaSO4) and of gypsum (CaSO4.2H2O) to 325 K



Heat capacities and entropies from 8 to 1000 K of langbeinite (K2Mg2(SO4)3), anhydrite (CaSO4) and of gypsum (CaSO4.2H2O) to 325 K



Thermochimica Acta 139: 67-81



Heat capacities of K2Mg2(SO4)3 (langbeinite) and CaSO4 (anhydrite) were measured from approximately 8 to 1000 K by combined shield calorimetry (8-365 K) and differential scanning calorimetry (350-1000 K). Heat capacities were also measured on natural crystals of gypsum (CaSO4.2H20) between 8.1 and 323.5 K. The molar entropies at 298.15 K, Smo(298.15 K), are 378.8 +or- 0.6, 107.4 +or- 0.2 and 193.8 +or- 0.3 J K-1 for langbeinite, anhydrite and gypsum, respectively.

Please choose payment method:






(PDF emailed within 1 workday: $29.90)

Accession: 001850059

Download citation: RISBibTeXText


Related references

A comparison of the Raman spectra of anhydrite (CaSO4) and gypsum (CaSO4).2H2O). Spectrochimica Acta Part A: Molecular Spectroscopy 29(1): 29-36, 1973

Application of x-ray phase analysis to determination of components in the system CaSO4.2H2O-CaSO4.0.5H2O-CaSO4. Journal of Analytical Chemistry 47(12, 1): 1445-1449, 1992

A method for the quantitative determination of the components of the CaSO4.2H2O-CaSO4.O.5H2O-CaSO4 system using DTA. Russian Journal of Inorganic Chemistry 34(3): 436-439, 1991

Quantitative determination of components of the system CaSO2.2H2O-CaSO4.0.5H2O-CaSO4 by analytical method using differential thermal analysis. Journal of Applied Chemistry of the USSR 64(11,I): 2168-2172, 1991

Gypsum-bonded investment and dental precision casting (IV) transformation of III-CaSO4 to II-CaSO4. Dental Materials Journal 23(3): 373-378, 2004

Reversal of setting expansion of gypsum-bonded investment containing admixed CaSO4.2H2O. Dental Materials Journal 3(1): 1-7, 1984

Effect of CaSO4 Pelletization Conditions on a Novel Process for Converting SO2 to Elemental Sulfur by Reaction Cycles involving CaSO4/CaS Part I. CaSO4 Pellet Strength and Reducibility by Hydrogen. Chemical Engineering & Technology 30(5): 628-634, 2007

Thermostimulated luminescence, photoluminescence and X-ray-induced luminescence in CaSO4 : Ce; CaSO4 : Ce, Na; CaSO4 : Ce, Mn and CaSO4 : Ce, Mn, Na phosphors. Journal of Luminescence 86(1): 67-78, 2000

Reversal of setting expansion of gypsum-bonded investments. Part II: Effect of CaSO4 X 2H2O concentrations. Aichi Gakuin Daigaku Shigakkai Shi 20(3): 302-306, 1982

Arsenic speciation in synthetic gypsum CaSO4·2H2O A synchrotron XAS, single-crystal EPR, and pulsed ENDOR study. Geochimica et Cosmochimica Acta 106: 524-540, 2013

Solubilization of natural gypsum (CaSO4.2H2O) and the formation of calcium oxalate by Aspergillus niger and Serpula himantioides. Mycological Research 102(7): 825-830, 1998

Gypsum (CaSO4·2H2O) Scaling on Polybenzimidazole and Cellulose Acetate Hollow Fiber Membranes under Forward Osmosis. Membranes 3(4): 354-374, 2013

High Dose and Phototransferred Thermoluminescence in CaSO4, CaSO4:Dy, and CaSO4:Tm. Radiation Protection Dosimetry 66(1): 213-216, 1996

In Situ Raman Spectroscopic Study of Gypsum (CaSO4·2H2O) and Epsomite (MgSO4·7H2O) Dehydration Utilizing an Ultrasonic Levitator. Journal of Physical Chemistry Letters 4(4): 669-673, 2013

Influence of nitrogen source on the solubilization of natural gypsum (CaSO4.2H2O) and the formation of calcium oxalate by different oxalic and citric acid-producing fungi. Mycological Research 103(4): 473-481, 1999