The Heat Capacity of Potassium Dihydrogen Phosphate from 15 to 300°K. The Anomaly at the Curie Temperature

Stephenson, C. C.; Hooley, J.G.

doi:10.1021/ja01236a054

Cited by 86 publications

(23 citation statements)

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“…1 The molar heat capacity of potassium dihydrogen phosphate. Open circles: from [2]. Closed circles: the present data.…”

Section: Experiments and Resultsmentioning

confidence: 85%

“…Stephenson and Hooley [2] measured the heat capacity of KDP between 13 and 300 K in a series of calorimetric studies on hydrogen bonded crystals. A conclusion they arrived at was that the transition entropy is about 3 J K -1 mo1-1.…”

Section: Introductionmentioning

confidence: 99%

“…Second, the experimentalvalue of the transition entropy was determined on an assumption about the value of the vibrational heat capacity. The assumption appears rather arbitrary, being simply a linear interpolation of the high and low temperature heat capacities into the transition region [2]. Since the excess part is a small fraction of the total heat capacity in the pre-transition region, a small change in the assumed interpolation results in a significant variation of the entropy of transition.…”

Section: Introductionmentioning

confidence: 99%

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The role of the ice rules in the thermal properties of potassium dihydrogen phosphate

Matsuo

Yamamuro

Oguni

et al. 1996

Journal of Thermal Analysis

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Calorimetric properties of potassium dihydrogen phosphate are examined by analysis of the heat capacity data taken from the literature and from a recent measurement. The analysis is based on an extensive use of harmonic heat capacity functions to separate the effect of the phase transition from the vibrational contribution. The transition enthalpy and entropy derived are 421 J mo1-1 and 3.79 J K -l mol -I, respectively. Characteristic temperatures of the lattice vibrations including the Debye temperature (254+18) K were determined. The transition entropy, exceeding the value compatible with the ice-rules, is consistent with the temperature dependence of the heat capacity. The implication of the result is discussed by comparison with the hydrogen bond networks in copper formate tetrahydrate and thallium dihydrogen phosphate.

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“…1 The molar heat capacity of potassium dihydrogen phosphate. Open circles: from [2]. Closed circles: the present data.…”

Section: Experiments and Resultsmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The role of the ice rules in the thermal properties of potassium dihydrogen phosphate

Matsuo

Yamamuro

Oguni

et al. 1996

Journal of Thermal Analysis

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“…The temperature step was 2 K far from T C and 0.02 K in the vicinity of the transition point. The accuracy of the specific heat measurements was 0.5% and was checked by comparing our data with the classical work [14] at low temperatures. …”

Section: Methodsmentioning

confidence: 95%

Phase transitions in KDP crystals with the complex organic and inorganic impurities

Strukov¹,

Shnaidshtein²,

Grabovsky³

2007

Condens. Matter Phys.

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In this paper we present the results of the study of dielectric and thermal properties of KDP crystals doped with different complex organic and inorganic molecules which decorate different (pyramidal or prismatic) crystal growth sectors. It is shown that the properties of stained and transparent parts of the crystal in comparison with the corresponding parts of the nominally pure crystal are different for KDP crystals grown by means of traditional (slow) and rapid growth technique. The difference of the domain contribution into dielectric constant of the polar phase and its characteristic hysteresis in pure and dyed crystals, transition temperature position, form of the specific heat anomaly are presented and analyzed. The most probable model of incorporation of the complex impurity molecules into KDP structure is proposed.

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“…(iii) Residual entropy measurements indicate the existence of more than one distinct location for each proton in ice (Giauque & Stout, 1936), KH2PO ~ (Stephenson & Hooley, 1944), KH2AsO 4 (Stephenson & Zettlemoyer, 1944a), Ntt4H2PO 4 (Stephenson & Zet~lemoyer, 1944b), NH4H2AsO4 (Stephenson &Adams, 1944) and Na2S04.10 H20 (Pitzer & Coulter, 1938), but do not give accurate estimates of statistical departures from the crystal arrangement of lowest energy as the temperature rises above 0 ° K. Direct studies of proton location have indicated less overlap at low temperatures in KH2PO 4 (Frazer & Pepinsky, 1953;Bacon & Pease, 1954). It is not yet clear, however, whether this is a free energy or zero-point energy effect.…”

Section: Fraction Of Proton Transfer Sites In a Crystalmentioning

confidence: 99%

Acid-base effects in hydrogen bonds in crystals

Ubbelohde¹,

Gallagher²

1955

Acta Cryst

298

187

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The Heat Capacity of Potassium Dihydrogen Phosphate from 15 to 300°K. The Anomaly at the Curie Temperature

Cited by 86 publications

References 0 publications

The role of the ice rules in the thermal properties of potassium dihydrogen phosphate

The role of the ice rules in the thermal properties of potassium dihydrogen phosphate

Phase transitions in KDP crystals with the complex organic and inorganic impurities

Acid-base effects in hydrogen bonds in crystals

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