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Title: Structural and thermal properties of Na 2Mn(SO 4) 2·4H 2O and Na 2Ni(SO 4) 2·10H 2O

Abstract

The title compounds were prepared via a wet chemistry route and their crystal structures were determined from single crystal X-ray diffraction data. Na 2Mn(SO 4) 2·4H 2O crystallizes with a monoclinic symmetry, space group P2 1/c, with a = 5.5415(2), b = 8.3447(3), c = 11.2281(3) Å, β = 100.172(1)°, V = 511.05(3) Å 3 and Z = 2. Na 2Ni(SO 4) 2·10H 2O also crystallizes with a monoclinic symmetry, space group P2 1/c, with a = 12.5050(8), b = 6.4812(4), c = 10.0210(6) Å, β = 106.138(2)°, V = 780.17(8) Å3 and Z = 2. Na 2Mn(SO 4) 2·4H 2O is a new member of the blödite family of compounds, whereas Na 2Ni(SO 4) 2·10H 2O is isostructural with Na 2Mg(SO 4) 2·10H 2O. The structure of Na 2Mn(SO 4) 2·4H 2O is built up of [Mn(SO 4) 2(H 2O) 4] 2– building blocks connected through moderate O–H…O hydrogen bonds with the sodium atoms occupying the large tunnels along the a axis and the manganese atom lying on an inversion center, whereas the structure of Na 2Ni(SO 4) 2·10H 2O is built up of [Ni(H 2O) 6] 2+ and [Na 2(SO 4) 2(H 2O) 4] 2– layers. These layersmore » which are parallel to the (100) plane are interconnected through moderate O–H…O hydrogen bonds. Here, the thermal gravimetric- and the powder X-ray diffraction-analyzes showed that only the nickel phase was almost pure. At a temperature above 300 °C, all the water molecules evaporated and a structural phase transition from P2 1/c-Na 2Ni(SO 4) 2·10H 2O to C2/c-Na 2Ni(SO 4) 2 was observed. C2/c-Na 2Ni(SO 4) 2 is thermally more stable than Na 2Fe(SO 4) 2 and therefore it would be suitable as the positive electrode for sodium ion batteries if a stable electrolyte at high voltage is developed.« less

Authors:
ORCiD logo [1];  [1];  [2]
  1. Hamad Bin Khalifa Univ., Doha (Qatar)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Electricity Delivery and Energy Reliability (OE); National Priorities Research Program; Qatar National Research Fund (QNRF)
OSTI Identifier:
1608197
Grant/Contract Number:  
AC05-00OR22725; NPRP9-263-2-122
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
RSC Advances
Additional Journal Information:
Journal Volume: 10; Journal Issue: 18; Journal ID: ISSN 2046-2069
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Ben Yahia, Hamdi, Alkhateeb, Alaa, and Essehli, Rachid. Structural and thermal properties of Na2Mn(SO4)2·4H2O and Na2Ni(SO4)2·10H2O. United States: N. p., 2020. Web. doi:10.1039/D0RA00301H.
Ben Yahia, Hamdi, Alkhateeb, Alaa, & Essehli, Rachid. Structural and thermal properties of Na2Mn(SO4)2·4H2O and Na2Ni(SO4)2·10H2O. United States. doi:10.1039/D0RA00301H.
Ben Yahia, Hamdi, Alkhateeb, Alaa, and Essehli, Rachid. Wed . "Structural and thermal properties of Na2Mn(SO4)2·4H2O and Na2Ni(SO4)2·10H2O". United States. doi:10.1039/D0RA00301H. https://www.osti.gov/servlets/purl/1608197.
@article{osti_1608197,
title = {Structural and thermal properties of Na2Mn(SO4)2·4H2O and Na2Ni(SO4)2·10H2O},
author = {Ben Yahia, Hamdi and Alkhateeb, Alaa and Essehli, Rachid},
abstractNote = {The title compounds were prepared via a wet chemistry route and their crystal structures were determined from single crystal X-ray diffraction data. Na2Mn(SO4)2·4H2O crystallizes with a monoclinic symmetry, space group P21/c, with a = 5.5415(2), b = 8.3447(3), c = 11.2281(3) Å, β = 100.172(1)°, V = 511.05(3) Å3 and Z = 2. Na2Ni(SO4)2·10H2O also crystallizes with a monoclinic symmetry, space group P21/c, with a = 12.5050(8), b = 6.4812(4), c = 10.0210(6) Å, β = 106.138(2)°, V = 780.17(8) Å3 and Z = 2. Na2Mn(SO4)2·4H2O is a new member of the blödite family of compounds, whereas Na2Ni(SO4)2·10H2O is isostructural with Na2Mg(SO4)2·10H2O. The structure of Na2Mn(SO4)2·4H2O is built up of [Mn(SO4)2(H2O)4]2– building blocks connected through moderate O–H…O hydrogen bonds with the sodium atoms occupying the large tunnels along the a axis and the manganese atom lying on an inversion center, whereas the structure of Na2Ni(SO4)2·10H2O is built up of [Ni(H2O)6]2+ and [Na2(SO4)2(H2O)4]2– layers. These layers which are parallel to the (100) plane are interconnected through moderate O–H…O hydrogen bonds. Here, the thermal gravimetric- and the powder X-ray diffraction-analyzes showed that only the nickel phase was almost pure. At a temperature above 300 °C, all the water molecules evaporated and a structural phase transition from P21/c-Na2Ni(SO4)2·10H2O to C2/c-Na2Ni(SO4)2 was observed. C2/c-Na2Ni(SO4)2 is thermally more stable than Na2Fe(SO4)2 and therefore it would be suitable as the positive electrode for sodium ion batteries if a stable electrolyte at high voltage is developed.},
doi = {10.1039/D0RA00301H},
journal = {RSC Advances},
issn = {2046-2069},
number = 18,
volume = 10,
place = {United States},
year = {2020},
month = {3}
}

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