New thermodynamic data for CoTiO3, NiTiO3 and CoCO3 based on low-temperature calorimetric measurements

The low-temperature heat capacities of nickel titanate (NiTiO3), cobalt titanate (CoTiO3), and cobalt carbonate (CoCO3) were measured between 2 and 300 K, and thermochemical functions were derived from the results. Our new data show previously unknown low-temperature lambda-shaped heat capacity anom...

Authors: Klemme, Stephan
Hermes, Wilfried
Eul, Mathias
Wijbrans, Clazina Heleen
Rohrbach, Arno
Pöttgen, Rainer
Division/Institute:FB 14: Geowissenschaften
Document types:Article
Media types:Text
Publication date:2011
Date of publication on miami:14.02.2013
Modification date:11.07.2019
Edition statement:[Electronic ed.]
Source:Chemistry Central Journa 5 (2011) 54
DDC Subject:550: Geowissenschaften, Geologie
License:CC BY 2.0
Language:English
Notes:Finanziert durch den Open-Access-Publikationsfonds 2011/2012 der Deutschen Forschungsgemeinschaft (DFG) und der Westfälischen Wilhelms-Universität Münster (WWU Münster).
Format:PDF document
URN:urn:nbn:de:hbz:6-47389419871
Permalink:http://nbn-resolving.de/urn:nbn:de:hbz:6-47389419871
Other Identifiers:DOI: doi:10.1186/1752-153X-5-54
Digital documents:1752-153X-5-54.pdf

The low-temperature heat capacities of nickel titanate (NiTiO3), cobalt titanate (CoTiO3), and cobalt carbonate (CoCO3) were measured between 2 and 300 K, and thermochemical functions were derived from the results. Our new data show previously unknown low-temperature lambda-shaped heat capacity anomalies peaking at 37 K for CoTiO3 and 26 K for NiTiO3. From our data we calculate standard molar entropies (298.15 K) for NiTiO3 of 90.9 ± 0.7 J mol-1 K-1 and for CoTiO3 of 94.4 ± 0.8 J mol-1 K-1. For CoCO3, we find only a small broad heat capacity anomaly, peaking at about 31 K. From our data, we suggest a new standard entropy (298.15 K) for CoCO3 of 88.9 ± 0.7 J mol-1 K-1.