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: | |
|---|---|
| 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 |
| Other Identifiers: | DOI: doi:10.1186/1752-153X-5-54 |
| Permalink: | https://nbn-resolving.de/urn:nbn:de:hbz:6-47389419871 |
| 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.