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Description
| - Heat capacity and enthalpy increments of calcium niobates CaNb2O6 and Ca2Nb2O7 were measured by the relaxation time method (2-300 K), DSC (260-360 K) and drop calorimetry (669-1421 K). Temperature dependencies of the molar heat capacity in the form Cpm=200.4+0.03432T-3.450?10^6/T^2 J/K/mol for CaNb2O6 and Cpm=257.2+0.03621T?4.435-10^6/T^2 J/K/mol for Ca2Nb2O7 were derived by the least-squares method from the experimental data. The molar entropies at 298.15 K, S_m^0(CaNb2O6,298.15 K)=167.3+-0.9 J/K/mol and S_m^0 (Ca2Nb2O7, 298.15 K)=212.4+-1.2 J/K/1 mol, were evaluated from the low temperature heat capacity measurements. Standard enthalpies of formation at 298.15 K were derived using published values of Gibbs energy of formation and presented heat capacity and entropy data: deltaHf^0(CaNb2O6, 298.15 K)= -2664.52 kJ/mol and deltafH^0 (Ca2Nb2O7,298.15 K)= -3346.91 kJ/mol.
- Heat capacity and enthalpy increments of calcium niobates CaNb2O6 and Ca2Nb2O7 were measured by the relaxation time method (2-300 K), DSC (260-360 K) and drop calorimetry (669-1421 K). Temperature dependencies of the molar heat capacity in the form Cpm=200.4+0.03432T-3.450?10^6/T^2 J/K/mol for CaNb2O6 and Cpm=257.2+0.03621T?4.435-10^6/T^2 J/K/mol for Ca2Nb2O7 were derived by the least-squares method from the experimental data. The molar entropies at 298.15 K, S_m^0(CaNb2O6,298.15 K)=167.3+-0.9 J/K/mol and S_m^0 (Ca2Nb2O7, 298.15 K)=212.4+-1.2 J/K/1 mol, were evaluated from the low temperature heat capacity measurements. Standard enthalpies of formation at 298.15 K were derived using published values of Gibbs energy of formation and presented heat capacity and entropy data: deltaHf^0(CaNb2O6, 298.15 K)= -2664.52 kJ/mol and deltafH^0 (Ca2Nb2O7,298.15 K)= -3346.91 kJ/mol. (en)
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Title
| - Heat capacity, enthalpy and entropy of calcium niobates
- Heat capacity, enthalpy and entropy of calcium niobates (en)
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skos:prefLabel
| - Heat capacity, enthalpy and entropy of calcium niobates
- Heat capacity, enthalpy and entropy of calcium niobates (en)
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skos:notation
| - RIV/60461373:22340/09:00022006!RIV10-MSM-22340___
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http://linked.open...avai/riv/aktivita
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http://linked.open...avai/riv/aktivity
| - P(GA104/07/1209), P(GA525/07/0903), Z(MSM0021620834), Z(MSM6046137302), Z(MSM6046137307)
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http://linked.open...iv/cisloPeriodika
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http://linked.open...vai/riv/dodaniDat
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http://linked.open...aciTvurceVysledku
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http://linked.open.../riv/druhVysledku
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http://linked.open...iv/duvernostUdaju
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http://linked.open...titaPredkladatele
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http://linked.open...dnocenehoVysledku
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http://linked.open...ai/riv/idVysledku
| - RIV/60461373:22340/09:00022006
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http://linked.open...riv/jazykVysledku
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http://linked.open.../riv/klicovaSlova
| - Oxides; Strontium niobates; Calorimetry; Heat capacity; Enthalpy increments; Heat of formation; Entropy (en)
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http://linked.open.../riv/klicoveSlovo
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http://linked.open...odStatuVydavatele
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http://linked.open...ontrolniKodProRIV
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http://linked.open...i/riv/nazevZdroje
| - Journal of Thermal Analysis and Calorimetry
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http://linked.open...in/vavai/riv/obor
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http://linked.open...ichTvurcuVysledku
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http://linked.open...cetTvurcuVysledku
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http://linked.open...vavai/riv/projekt
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http://linked.open...UplatneniVysledku
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http://linked.open...v/svazekPeriodika
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http://linked.open...iv/tvurceVysledku
| - Růžička, Květoslav
- Svoboda, Pavel
- Leitner, Jindřich
- Sedmidubský, David
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http://linked.open...ain/vavai/riv/wos
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http://linked.open...n/vavai/riv/zamer
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issn
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number of pages
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http://localhost/t...ganizacniJednotka
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