Formation and dehydration enthalpy of potassium hexaniobate

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

doi:10.1111/jace.14465

Formation and dehydration enthalpy of potassium hexaniobate

Journal Article · Thu Sep 15 04:00:00 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.

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

References (32)

Thermodynamics of Nanoscale Calcium and Strontium Titanate Perovskites Sahu, Sulata K.; Maram, Pardha S.; Navrotsky, Alexandra Journal of the American Ceramic Society, Vol. 96, Issue 11 https://doi.org/10.1111/jace.12622	journal	October 2013
Prototype Sandia Octahedral Molecular Sieve (SOMS) Na ₂ Nb ₂ O ₆ ·H ₂ O: Synthesis, Structure and Thermodynamic Stability Xu, Hongwu; Nyman, May; Nenoff, Tina M. Chemistry of Materials, Vol. 16, Issue 10 https://doi.org/10.1021/cm035066i	journal	May 2004
Thermodynamic stability of lead-free alkali niobate and tantalate perovskites Sahu, Sulata K.; Zlotnik, Sebastian; Navrotsky, Alexandra Journal of Materials Chemistry C, Vol. 3, Issue 29 https://doi.org/10.1039/C5TC01308A	journal	January 2015
Layered niobate nanosheets: building blocks for advanced materials assembly Bizeto, Marcos A.; Shiguihara, Ana L.; Constantino, Vera R. L. Journal of Materials Chemistry, Vol. 19, Issue 17 https://doi.org/10.1039/b821435b	journal	January 2009
Progress and New Directions in Calorimetry: A 2014 Perspective Navrotsky, Alexandra Journal of the American Ceramic Society, Vol. 97, Issue 11 https://doi.org/10.1111/jace.13278	journal	October 2014
Thermodynamic studies of zeolites: clinoptilolite Johnson, G. K.; Tasker, I. R.; Jurgens, R. The Journal of Chemical Thermodynamics, Vol. 23, Issue 5 https://doi.org/10.1016/S0021-9614(05)80135-1	journal	May 1991
Scrolled Sheet Precursor Route to Niobium and Tantalum Oxide Nanotubes Kobayashi, Yoji; Hata, Hideo; Salama, Magda Nano Letters, Vol. 7, Issue 7 https://doi.org/10.1021/nl0708260	journal	July 2007
Intercalation of Pt(II) Terpyridine Complexes into Layered K ₄ Nb ₆ O ₁₇ and Visible-Light-Driven Photocatalytic Production of H ₂ Mori, Kohsuke; Ogawa, Sohma; Martis, Martin The Journal of Physical Chemistry C, Vol. 116, Issue 35 https://doi.org/10.1021/jp3059799	journal	August 2012
Studies on the phase diagram of Pb–Fe–O system and standard molar Gibbs energy of formation of ‘PbFe5O8.5’ and Pb2Fe2O5 Sahu, Sulata Kumari; Ganesan, Rajesh; Gnanasekaran, T. Journal of Nuclear Materials, Vol. 426, Issue 1-3 https://doi.org/10.1016/j.jnucmat.2012.03.032	journal	July 2012
Standard molar Gibbs free energy of formation of Pb5CrO8(s), Pb2CrO5(s), and PbCrO4(s) Sahu, Sulata Kumari; Ganesan, Rajesh; Gnanasekaran, T. The Journal of Chemical Thermodynamics, Vol. 42, Issue 1 https://doi.org/10.1016/j.jct.2009.06.026	journal	January 2010
Preparation of a layered hexaniobate–titania nanocomposite and its photocatalytic activity on removal of phenol in water Wei, Qingming; Nakato, Teruyuki Journal of Porous Materials, Vol. 16, Issue 2 https://doi.org/10.1007/s10934-007-9179-2	journal	January 2008
Structural aspects and thermal behavior of the proton-exchanged layered niobate K4Nb6O17 Bizeto, Marcos A.; Constantino, Vera R. L. Materials Research Bulletin, Vol. 39, Issue 11 https://doi.org/10.1016/j.materresbull.2004.05.001	journal	September 2004
Energetics of lanthanide cobalt perovskites: LnCoO _3−δ (Ln = La, Nd, Sm, Gd) Sahu, Sulata Kumari; Tanasescu, Speranta; Scherrer, Barbara Journal of Materials Chemistry A, Vol. 3, Issue 38 https://doi.org/10.1039/C5TA03655K	journal	January 2015
Single- and Double-Layered Organically Modified Nanosheets by Selective Interlayer Grafting and Exfoliation of Layered Potassium Hexaniobate Kimura, Nanako; Kato, Yumi; Suzuki, Ryoko Langmuir, Vol. 30, Issue 4 https://doi.org/10.1021/la404223x	journal	September 2013
Controlling Catalytic Selectivity on Metal Nanoparticles by Direct Photoexcitation of Adsorbate–Metal Bonds Kale, Matthew J.; Avanesian, Talin; Xin, Hongliang Nano Letters, Vol. 14, Issue 9 https://doi.org/10.1021/nl502571b	journal	August 2014
Phase Equilibria in the System K ₂ CO ₃ -Nb ₂ O ₅ by the Method of Differential Thermal Analysis Reisman, Arnold; Holtzberg, Frederic Journal of the American Chemical Society, Vol. 77, Issue 8 https://doi.org/10.1021/ja01613a025	journal	April 1955
Mecanisme d'hydratation des niobates alcalins lamellaires de formule A4Nb4O17 (A = K, Rb, Cs) Gasperin, Madeleine; Le Bihan, Marie Thérèse Journal of Solid State Chemistry, Vol. 43, Issue 3 https://doi.org/10.1016/0022-4596(82)90251-1	journal	July 1982
Thermodynamics of Fe ₃ O ₄ –Co ₃ O ₄ and Fe ₃ O ₄ –Mn ₃ O ₄ spinel solid solutions at the bulk and nanoscale Sahu, Sulata K.; Huang, Baiyu; Lilova, Kristina Physical Chemistry Chemical Physics, Vol. 17, Issue 34 https://doi.org/10.1039/C5CP02972D	journal	January 2015
Transformation of potassium Lindquist hexaniobate to various potassium niobates: solvothermal synthesis and structural evolution mechanism Kong, Xingang; Hu, Dengwei; Wen, Puhong Dalton Transactions, Vol. 42, Issue 21 https://doi.org/10.1039/c3dt00062a	journal	January 2013
Understanding electronic and optical properties of N–Sn codoped anatase TiO2 Fang, Yu; Cheng, Daojian; Wu, Wei Computational Materials Science, Vol. 85 https://doi.org/10.1016/j.commatsci.2014.01.018	journal	April 2014
A Review on Visible Light Active Perovskite-Based Photocatalysts Kanhere, Pushkar; Chen, Zhong Molecules, Vol. 19, Issue 12 https://doi.org/10.3390/molecules191219995	journal	December 2014
Determination of heat capacities of PbCrO4(s), Pb2CrO5(s), and Pb5CrO8(s) Sahu, Sulata K.; Sahu, Manjulata; Srinivasa, Raman S. Monatshefte für Chemie - Chemical Monthly, Vol. 143, Issue 9 https://doi.org/10.1007/s00706-012-0756-y	journal	August 2012
Preparation of Layered K₄Nb₆O₁₇ and its Photocatalytic Activity for Hydrogen Production Cui, Wen Quan; Liu, Yan Fei; Hu, Jin Shan Advanced Materials Research, Vol. 399-401 https://doi.org/10.4028/www.scientific.net/AMR.399-401.1506	journal	November 2011
The standard molar enthalpies of formation of Pb2Fe2O5(s) and PbFe5O8.5(s) by acid solution calorimetry Sahu, Sulata Kumari; Ganesan, Rajesh; Gnanasekaran, T. The Journal of Chemical Thermodynamics, Vol. 56 https://doi.org/10.1016/j.jct.2012.07.004	journal	January 2013
Conversion of Metal Oxide Nanosheets into Nanotubes Ma, Renzhi; Sasaki, Takayoshi Topics in Applied Physics https://doi.org/10.1007/978-3-642-03622-4_10	book	January 2010
Humidity-Dependent Reversible Aggregation of Rhodamine 6G Dye Immobilized within Layered Niobate K ₄ Nb ₆ O ₁₇ Shinozaki, Ryota; Nakato, Teruyuki Langmuir, Vol. 20, Issue 18 https://doi.org/10.1021/la049354k	journal	August 2004
Imaging helical potassium hexaniobate nanotubes Du, G. H.; Peng, L. -M.; Chen, Q. Applied Physics Letters, Vol. 83, Issue 8 https://doi.org/10.1063/1.1605235	journal	August 2003
Pyrochlore and Perovskite Potassium Tantalate: Enthalpies of Formation and Phase Transformation Zlotnik, Sebastian; Sahu, Sulata K.; Navrotsky, Alexandra Chemistry - A European Journal, Vol. 21, Issue 13 https://doi.org/10.1002/chem.201405666	journal	February 2015
Chemical modification of niobium layered oxide by tetraalkylammonium intercalation Shiguihara, Ana L.; Bizeto, Marcos A.; Constantino, Vera R. L. Journal of the Brazilian Chemical Society, Vol. 21, Issue 7 https://doi.org/10.1590/S0103-50532010000700024	journal	January 2010
Energetics of Formation and Hydration of a Porous Metal Organic Nanotube Sahu, Sulata K.; Unruh, Daniel K.; Forbes, Tori Z. Chemistry of Materials, Vol. 26, Issue 17 https://doi.org/10.1021/cm5024053	journal	August 2014
Revelation of the Photoactive Species in the Photocatalytic Dimerization of α-Methylstyrene by a Dinuclear Ruthenium–Palladium Complex Murata, Kei; Inagaki, Akiko; Akita, Munetaka Inorganic Chemistry, Vol. 52, Issue 14 https://doi.org/10.1021/ic400666v	journal	July 2013
Growth and Properties of K4Nb6O17 Loiacono, G. M.; Michelman, B. Journal of the American Ceramic Society, Vol. 51, Issue 9 https://doi.org/10.1111/j.1151-2916.1968.tb15692.x	journal	September 1968

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36 MATERIALS SCIENCE
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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formation enthalpy
multilayers
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