Apparent molar heat capacity and other thermodynamic properties of aqueous potassium chloride solutions to high temperatures and pressures

1988 ◽  
Vol 33 (3) ◽  
pp. 354-362 ◽  
Author(s):  
Roberto T. Pabalan ◽  
Kenneth S. Pitzer
Keyword(s):  
Heat Capacity ◽  
Thermodynamic Properties ◽  
Potassium Chloride ◽  
High Temperatures ◽  
Molar Heat Capacity ◽  
Apparent Molar Heat Capacity ◽  
Chloride Solutions

Capacité calorifique de polyélectrolytes en solution

1985 ◽  
Vol 63 (7) ◽  
pp. 1568-1571 ◽  
Author(s):  
Hubert Daoust ◽  
Hoa Le Thanh ◽  
Pierre Ferland ◽  
Daniel St-Cyr
Keyword(s):  
Heat Capacity ◽  
Sodium Salt ◽  
Polyacrylic Acid ◽  
Molar Heat Capacity ◽  
Conformational Transformation ◽  
Polymethacrylic Acid ◽  
High Dilution ◽  
Constant Concentration ◽  
Apparent Molar Heat Capacity ◽  
Low Concentrations

Heat capacities of polyelectrolytes in aqueous solutions have been measured at 25 °C using a Picker-type dynamic micro-calorimeter. The precision of the apparatus is such that it is possible to calculate the apparent molar heat capacity [Formula: see text] of the solute, even at high dilution. The polymers that were studied include polymethacrylic acid (PMAH) and polyacrylic acid (PAH), as well as its sodium salt and the sodium salt of the polystyrènesulfonate. For the salts, the results show that the value of [Formula: see text] decreases rapidly with dilution to low concentrations; this result is in perfect concordance with a relation derived from the theory of Lifson and Katchalsky. A study of the variation of [Formula: see text] at a constant concentration, with the extent of the neutralization of the acids PMAH and PAH has also been conducted. As has been shown previously, the chain of the PMAH undergoes a conformational transformation when the level of neutralization gets close to 25%. This transformation implies an increase of the value of [Formula: see text] [Journal translation]

Molar Heat Capacity and Thermodynamic Properties of 4-Methyl-4-cyclohexene-1,2-dicarboxylic Anhydride [C9H10O3]

2005 ◽  
Vol 50 (3) ◽  
pp. 932-935 ◽  
Author(s):  
Xue-Chuan Lv ◽  
Zhi-Cheng Tan ◽  
Quan Shi ◽  
Hong-Tao Zhang ◽  
Li-Xian Sun ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Thermodynamic Properties ◽  
Molar Heat Capacity

FIRST-PRINCIPLES CALCULATIONS OF STRUCTURE, STABILITY AND THERMODYNAMIC PROPERTIES OF fcc-6LiT UNDER HIGH TEMPERATURES AND PRESSURES

2011 ◽  
Vol 25 (05) ◽  
pp. 333-344 ◽  
Author(s):  
CHENGHUA HU ◽  
FENG WANG ◽  
CHUANHUI XIA ◽  
ZHOU ZHENG ◽  
WEIYI REN
Keyword(s):  
Heat Capacity ◽  
Melting Point ◽  
Thermodynamic Properties ◽  
Debye Temperature ◽  
High Temperatures ◽  
First Principles ◽  
Critical Pressure ◽  
Structure Stability ◽  
First Principles Calculations ◽  
Different Temperatures

We perform first-principles calculations for fcc-6 LiT in order to study its structure, stability and thermodynamic properties under high temperatures and pressures. We find that melting point of 6 LiT (0 GPa) is about 680 K, and rise with the pressures. Reverse equivalent pressure P r and critical pressure P c of different temperatures are predicted from [Formula: see text] or [Formula: see text], and they are found to increase with temperature. 6 LiT should be stable under the condition of P < 80 GPa and T < 680 K . We also find that pressure and temperature will cause different effect of shear on the {100} and {110} planes. Heat capacity of different pressures increase with temperature and closes to the Dulong–Petit limit at higher temperatures. Debye temperature decreases with temperature, and increases with pressure.

scholarly journals Высокотемпературная теплоемкость германатов Pr-=SUB=-2-=/SUB=-Ge-=SUB=-2-=/SUB=-O-=SUB=-7-=/SUB=- и Nd-=SUB=-2-=/SUB=-Ge-=SUB=-2-=/SUB=-O-=SUB=-7-=/SUB=- в области 350-1000 K

2018 ◽  
Vol 60 (3) ◽  
pp. 618
Author(s):  
Л.Т. Денисова ◽  
Л.А. Иртюго ◽  
В.В. Белецкий ◽  
Н.В. Белоусова ◽  
В.М. Денисов
Keyword(s):  
Differential Scanning Calorimetry ◽  
Heat Capacity ◽  
Thermodynamic Properties ◽  
Temperature Effect ◽  
Molar Heat Capacity ◽  
Solid Phase Synthesis ◽  
Solid Phase ◽  
Scanning Calorimetry ◽  
Phase Synthesis

AbstractPr2Ge2O7 and Nd2Ge2O7 were obtained via solid-phase synthesis from Pr2O3 ( Nd2O3 ) and GeO2 with multistage firing in air within 1273–1473 K. A temperature effect on molar heat capacity of the oxide compounds was measured with a differential scanning calorimetry. Their thermodynamic properties were calculated from the C _ P = f ( T ) dependences.

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