Heat capacity, enthalpy and entropy of strontium bismuth niobate and strontium bismuth tantalate
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F06%3A00016715" target="_blank" >RIV/60461373:22340/06:00016715 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
Heat capacity, enthalpy and entropy of strontium bismuth niobate and strontium bismuth tantalate
Original language description
The heat capacities and enthalpy increments of strontium bismuth niobate SrBi2Nb2O9 (SBN) and strontium bismuth tantalate SrBi2Ta2O9 (SBT) were measured by the relaxation method (2-150 K), Calvet-type heat-conduction calorimetry (305-570 K) and drop calorimetry (773-1373 K). The temperature dependences of non-transition heat capacities in the form Cpm = 324.47 + 0.06371T - 5.0755 x 106/T2 J K-1 mol-1 (298-1400 K) and Cpm = 320.22 + 0.06451T - 4.7001 x 106/T2 J K-1 mol-1 (298-1400 K) were derived for SBNand SBT, respectively, by the least-squares method from the experimental data. Furthermore, the standard molar entropies at 298.15 K Sm[deg](SBN)=327.15+/-0.80 and Sm[deg](SBT)=339.23+/-0.72 J K-1 mol-1 were evaluated from the low-temperature heat capacity measurements.
Czech name
Tepelná kapacita, entalpie a entropie strontium bismut niobátu a strontium bismut tantalátu
Czech description
Tepelné kapacity a změny entalpie pro SrBi2Nb2O9 (SBN) a SrBi2Ta2O9 (SBT) byly proměřeny metodami relaxační kalorimetrie (2-150 K), tepelně-vodivostní kalorimetrie Calvetova typu (305-570 K) a vhazovací kalorimetrie (773-1373 K). Závislost tepelné kapacity na teplotě, stanovená z experimentálních dat metodou nejmenších čtverců, má pro SBN tvar Cpm = 324.47 + 0.06371T - 5.0755 x 106/T2 J K-1 mol-1 (298-1400 K) a pro SBT tvar Cpm = 320.22 + 0.06451T - 4.7001 x 106/T2 J K-1 mol-1 (298-1400 K). Navíc byla na základě níkoteplotních dat o tepelné kapacitě stanovena hodnota standardní molární entropie při teplotě 298.15 K: Sm0(SBN)=327.15+/-0.80 J/mol/K a Sm0(SBT)=339.23+/-0.72 J/mol/K.
Classification
Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
CF - Physical chemistry and theoretical chemistry
OECD FORD branch
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Result continuities
Project
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Continuities
Z - Vyzkumny zamer (s odkazem do CEZ)
Others
Publication year
2006
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Thermochimica Acta
ISSN
0040-6031
e-ISSN
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Volume of the periodical
450
Issue of the periodical within the volume
1-2
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
5
Pages from-to
105-109
UT code for WoS article
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EID of the result in the Scopus database
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