Formation and Dehydration Enthalpy of Potassium Hexaniobate

Sahu, Sulata K.; Boatner, Lynn A.; Navrotsky, Alexandra; Wong‐Ng, ed., W. K.

doi:10.1111/jace.14465

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:1401477

Sahu, Sulata K. ^[1]; Boatner, Lynn A. ^[2]; Navrotsky, Alexandra ^[3]; Wong‐Ng, ed., W. K.

Peter A. Rock Thermochemistry Laboratory and NEAT ORU University of California Davis Davis California 95616, Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge Massachusetts 02139
Oak Ridge National Laboratory Synthesis and Processing of Novel Materials Group Oak Ridge Tennessee 37831
Peter A. Rock Thermochemistry Laboratory and NEAT ORU University of California Davis Davis California 95616

The formation energetics of hydrous and dehydrated potassium hexaniobates are investigated using high‐temperature oxide melt solution calorimetry. The enthalpies of formation of K ₄ Nb ₆ O ₁₇ and K ₄ Nb ₆ O ₁₇ ·3H ₂ O from oxides are (−864.42 ± 10.63) and (−899.32 ± 11.48) kJ/mol, respectively. The formation enthalpy of K ₄ Nb ₆ O ₁₇ from elements is (−7289.64 ± 12.50) kJ/mol, and of K ₄ Nb ₆ O ₁₇ ·3H ₂ O is (−8181.94 ± 13.24) kJ/mol. The enthalpy of dehydration (Δ H _dehy ) for the reaction K ₄ Nb ₆ O ₁₇ ·3H ₂ O (xl, 25°C) = K ₄ Nb ₆ O ₁₇ (xl, 25°C) + 3H ₂ O (l, 25°C) is endothermic and is 34.60 ± 7.56 kJ/mol. The Δ H _dehy per mole of water, 11.53 ± 2.52 kJ/mol, indicates the water molecules in K ₄ Nb ₆ O ₁₇ ·3H ₂ O are not just physically adsorbed, but loosely bonded in the K ₄ Nb ₆ O ₁₇ phase, presumably in specific interlayer sites. The loss of this water near 100°C on heating is consistent with the weak bonding of water.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-03ER46053

OSTI ID:: 1401477

Alternate ID(s):: OSTI ID: 1326482

Journal Information:: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 1 Vol. 100; ISSN 0002-7820

Publisher:: Wiley-BlackwellCopyright Statement

Country of Publication:: United States

Language:: English

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