About: Application of Neumann-Kopp rule for the estimation of heat capacity of mixed oxides

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Description	The empirical Neumann-Kopp rule (NKR) for the estimation of temperature dependence of heat capacity of mixed oxide is analyzed. NKR gives a reasonable estimate of C-pm for most mixed oxides around room temperature, but at both low and high temperatures the accuracy of the estimate is Substantially lowered. At very low temperatures, the validity of NKR is shown to be predominantly determined by the relation between the characteristic Debye and Einstein temperatures of a mixed oxide and its constituents. At high temperatures, the correlation between their molar Volumes, volume expansion coefficients and compressibilities takes the dominance. In cases where the formation of a mixed oxide is not accompanied by any volume change, the difference between dilatation contributions to heat capacity of a mixed oxide and its constituents is exclusively negative. It turns Out that in the high-temperature range, where the contribution of harmonic lattice vibrations approached the 3NR limit, Delta C-ox(p) assumes ne The empirical Neumann-Kopp rule (NKR) for the estimation of temperature dependence of heat capacity of mixed oxide is analyzed. NKR gives a reasonable estimate of C-pm for most mixed oxides around room temperature, but at both low and high temperatures the accuracy of the estimate is Substantially lowered. At very low temperatures, the validity of NKR is shown to be predominantly determined by the relation between the characteristic Debye and Einstein temperatures of a mixed oxide and its constituents. At high temperatures, the correlation between their molar Volumes, volume expansion coefficients and compressibilities takes the dominance. In cases where the formation of a mixed oxide is not accompanied by any volume change, the difference between dilatation contributions to heat capacity of a mixed oxide and its constituents is exclusively negative. It turns Out that in the high-temperature range, where the contribution of harmonic lattice vibrations approached the 3NR limit, Delta C-ox(p) assumes ne (en)
Title	Application of Neumann-Kopp rule for the estimation of heat capacity of mixed oxides Application of Neumann-Kopp rule for the estimation of heat capacity of mixed oxides (en)
skos:prefLabel	Application of Neumann-Kopp rule for the estimation of heat capacity of mixed oxides Application of Neumann-Kopp rule for the estimation of heat capacity of mixed oxides (en)
skos:notation	RIV/60461373:22310/10:00023118!RIV11-GA0-22310___
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	1-2
http://linked.open...vai/riv/dodaniDat	2011
http://linked.open...aciTvurceVysledku	Leitner, Jindřich Sedmidubský, David Voňka, Petr
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 chemické technologie
http://linked.open...dnocenehoVysledku	247464
http://linked.open...ai/riv/idVysledku	RIV/60461373:22310/10:00023118
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Mixed oxides; Heat capacity; Estimation; Neumann-Kopp rule (en)
http://linked.open.../riv/klicoveSlovo	Neumann-Kopp rule Estimation Mixed oxides Heat capacity
http://linked.open...odStatuVydavatele	NL - Nizozemsko
http://linked.open...ontrolniKodProRIV	[E29044D368B2]
http://linked.open...i/riv/nazevZdroje	Thermochimica Acta
http://linked.open...in/vavai/riv/obor	CA
http://linked.open...ichTvurcuVysledku	3 (xsd:int)
http://linked.open...cetTvurcuVysledku	4 (xsd:int)
http://linked.open...vavai/riv/projekt	Thermochemical properties of lead-free ferroelectric oxides available for FeRAM fabrication
http://linked.open...UplatneniVysledku	2010
http://linked.open...v/svazekPeriodika	497
http://linked.open...iv/tvurceVysledku	Svoboda, Pavel Leitner, Jindřich Sedmidubský, David Voňka, Petr
http://linked.open...ain/vavai/riv/wos	000274859700002
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	7 (xsd:int)
http://localhost/t...ganizacniJednotka	22310
is http://linked.open...avai/riv/vysledek of	Application of Neumann-Kopp rule for the estimation of heat capacity of mixed oxides

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