Formation and dehydration enthalpy of potassium hexaniobate

Sahu, Sulata K.; Boatner, Lynn A.; Navrotsky, Alexandra

doi:10.1111/jace.14465

Title: Formation and dehydration enthalpy of potassium hexaniobate

Journal Article · Thu Sep 15 00:00:00 EDT 2016 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/jace.14465· OSTI ID:1326482

Sahu, Sulata K. ^[1]; Boatner, Lynn A. ^[2]; Navrotsky, Alexandra ^[3]

Univ. of California, Davis, CA (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of California, Davis, CA (United States)

The formation energetics of hydrous and dehydrated potassium hexaniobates are investigated using high-temperature oxide melt solution calorimetry. The enthalpies of formation of K₄Nb₆O₁₇ and K₄Nb₆O₁₇•3H₂O from oxides are (–864.42 ± 10.63) and (–899.32 ± 11.48) kJ/mol, respectively. The formation enthalpy of K₄Nb₆O₁₇ from elements is (–7289.64 ± 12.50) kJ/mol, and of K₄Nb₆O₁₇•3H₂O is (–8181.94 ± 13.24) kJ/mol. The enthalpy of dehydration (ΔH_dehy) for the reaction K₄Nb₆O₁₇3H₂O (xl, 25 °C) = K₄Nb₆O₁₇ (xl, 25 °C) + 3H₂O (l, 25 °C) is endothermic and is 34.60 ± 7.56 kJ/mol. The ΔH_dehy per mole of water, 11.53 ± 2.52 kJ/mol, indicates the water molecules in K₄Nb₆O₁₇•3H₂O are not just physically adsorbed, but loosely bonded in the K₄Nb₆O₁₇ phase, presumably in specific interlayer sites. As a result, the loss of this water near 100 °C on heating is consistent with the weak bonding of water.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 1326482

Journal Information:: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society; ISSN 0002-7820

Publisher:: American Ceramic Society

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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Title: Formation and dehydration enthalpy of potassium hexaniobate

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