About: Heat capacity, enthalpy and entropy of strontium niobate Sr2Nb2O7 and calcium niobate Ca2Nb2O7

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Description	The heat capacity and the enthalpy increments of strontium niobate Sr2Nb2O7 and calcium niobate Ca2Nb2O7 were measured by the relaxation time method (2-300 K), DSC (260-360 K) and drop calorimetry (720-1370 K). Temperature dependencies of the molar heat capacity in the form Cpm = 248.0 + 0.04350T - 3.948 x 10^6/T2 J K-1 mol-1 for Sr2Nb2O7 and Cpm = 257.2 + 0.03621T - 4.434 x 10^6/T2 J K-1 mol-1 for Ca2Nb2O7 were derived by the least-square method from the experimental data. The molar entropies at 298.15 K, Sm°(298.15 K) = 238.5 +- 1.3 J K-1 mol-1 for Sr2Nb2O7 and Sm°(298.15 K) = 212.4 +- 1.2 J K-1 mol-1 for Ca2Nb2O7, were evaluated from the low-temperature heat capacity measurements. The heat capacity and the enthalpy increments of strontium niobate Sr2Nb2O7 and calcium niobate Ca2Nb2O7 were measured by the relaxation time method (2-300 K), DSC (260-360 K) and drop calorimetry (720-1370 K). Temperature dependencies of the molar heat capacity in the form Cpm = 248.0 + 0.04350T - 3.948 x 10^6/T2 J K-1 mol-1 for Sr2Nb2O7 and Cpm = 257.2 + 0.03621T - 4.434 x 10^6/T2 J K-1 mol-1 for Ca2Nb2O7 were derived by the least-square method from the experimental data. The molar entropies at 298.15 K, Sm°(298.15 K) = 238.5 +- 1.3 J K-1 mol-1 for Sr2Nb2O7 and Sm°(298.15 K) = 212.4 +- 1.2 J K-1 mol-1 for Ca2Nb2O7, were evaluated from the low-temperature heat capacity measurements. (en) Tepelná kapacita a změny entalpie stroncium niobátu Sr2Nb2O7 a kalcium niobátu Ca2Nb2O7 byly změřeny relaxační metodou (2-300 K), DSC (260-360 K) a vhazovací kalorimetrií (720-1370 K). Teplotní závislost molární tepelné kapacity má tvar Cpm = 248.0 + 0.04350T - 3.948 x 106/T2 J K-1 mol-1 pro Sr2Nb2O7 a Cpm = 257.2 + 0.03621T - 4.434 x 106/T2 J K-1 mol-1 pro Ca2Nb2O7. Molární entropie při 298.15 K má hodnoty Sm°(298.15 K) = 238.5+- 1.3 J K-1 mol-1 pro Sr2Nb2O7 a Sm°(298.15 K) = 212.4 +- 1.2 J K-1 mol-1 pro Ca2Nb2O7. Tyto hodnoty byly získány z nízkoteplotních měření tepelných kapacit. (cs)
Title	Heat capacity, enthalpy and entropy of strontium niobate Sr2Nb2O7 and calcium niobate Ca2Nb2O7 Heat capacity, enthalpy and entropy of strontium niobate Sr2Nb2O7 and calcium niobate Ca2Nb2O7 (en) Tepelná kapacita, entalpie a entropie stroncium niobátu Sr2Nb2O7 a kalcium niobátu Ca2Nb2O7 (cs)
skos:prefLabel	Heat capacity, enthalpy and entropy of strontium niobate Sr2Nb2O7 and calcium niobate Ca2Nb2O7 Heat capacity, enthalpy and entropy of strontium niobate Sr2Nb2O7 and calcium niobate Ca2Nb2O7 (en) Tepelná kapacita, entalpie a entropie stroncium niobátu Sr2Nb2O7 a kalcium niobátu Ca2Nb2O7 (cs)
skos:notation	RIV/60461373:22340/08:00020650!RIV09-MSM-22340___
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(GA104/07/1209), Z(MSM0021620834), Z(MSM6046137302), Z(MSM6046137307)
http://linked.open...iv/cisloPeriodika	1
http://linked.open...vai/riv/dodaniDat	2009
http://linked.open...aciTvurceVysledku	Hampl, Milan Leitner, Jindřich Sedmidubský, David Růžička, Květoslav
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Vysoká škola chemicko-technologická v Praze / Fakulta chemicko-inženýrská
http://linked.open...dnocenehoVysledku	369894
http://linked.open...ai/riv/idVysledku	RIV/60461373:22340/08:00020650
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Heat capacity; Entropy; Calorimetry; Strontium niobate; Calcium niobate (en)
http://linked.open.../riv/klicoveSlovo	Entropy Calorimetry Heat capacity Calcium niobate Strontium niobate
http://linked.open...odStatuVydavatele	NL - Nizozemsko
http://linked.open...ontrolniKodProRIV	[97D58949C2AB]
http://linked.open...i/riv/nazevZdroje	Thermochimica Acta
http://linked.open...in/vavai/riv/obor	CF
http://linked.open...ichTvurcuVysledku	4 (xsd:int)
http://linked.open...cetTvurcuVysledku	6 (xsd:int)
http://linked.open...vavai/riv/projekt	Thermochemical properties of lead-free ferroelectric oxides available for FeRAM fabrication
http://linked.open...UplatneniVysledku	2008
http://linked.open...v/svazekPeriodika	475
http://linked.open...iv/tvurceVysledku	Růžička, Květoslav Straka, Martin Svoboda, Pavel Leitner, Jindřich Sedmidubský, David Hampl, Milan
http://linked.open...ain/vavai/riv/wos	000259831700006
http://linked.open...n/vavai/riv/zamer	Condensed Matter Physics – New Materials and Technologies Preparation and research of functional materials and material technologies using micro- and nanoscopic methods Physico-chemical methods of analysis and characterization of chemical systems and biosystems
issn	0040-6031
number of pages	6 (xsd:int)
http://localhost/t...ganizacniJednotka	22340
is http://linked.open...avai/riv/vysledek of	Heat capacity, enthalpy and entropy of strontium niobate Sr2Nb2O7 and calcium niobate Ca2Nb2O7 Heat capacity, enthalpy and entropy of strontium niobate Sr2Nb2O7 and calcium niobate Ca2Nb2O7 Heat capacity, enthalpy and entropy of strontium niobate Sr2Nb2O7 and calcium niobate Ca2Nb2O7 Heat capacity, enthalpy and entropy of strontium niobate Sr2Nb2O7 and calcium niobate Ca2Nb2O7

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