Research output: Contribution to journal › Article › peer-review
Structural and transport properties of neodymium tungstates prepared via mechanochemical activation. / Bespalko, Y.; Eremeev, N.; Skryabin, P. et al.
In: Ceramics International, Vol. 45, No. 7, 01.05.2019, p. 9529-9536.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Structural and transport properties of neodymium tungstates prepared via mechanochemical activation
AU - Bespalko, Y.
AU - Eremeev, N.
AU - Skryabin, P.
AU - Krieger, T.
AU - Chesalov, Y.
AU - Lapina, O.
AU - Khabibulin, D.
AU - Ulihin, A.
AU - Uvarov, N.
AU - Sadykov, V.
PY - 2019/5/1
Y1 - 2019/5/1
N2 - Nd5.5WO11.25-δ, (Nd5/6La1/6)5.5WO11.25-δ and Nd5.5W0.5Mo0.5O11.25-δ mixed oxides have been prepared using mechanochemical activation (MA) of Nd2O3-WO3, Nd2O3-La2O3-WO3, Nd2O3-MoO3-WO3 mixtures in a high-power planetary ball mill. Genesis of these tungstates structural properties was studied by XRD, SEM, TEM with EDX analysis, 1H NMR, IR and Raman spectroscopy. X-ray diffraction has revealed that MA results in formation of a pure fluorite structure already after milling. High-density ceramic pellets have been obtained after sintering at 1350 °C. Transport properties of Nd5.5WO11.25-δ mixed oxide were improved by the partial substitution of Nd with La in (Nd5/6La1/6)5.5WO11.25-δ and W with Mo in Nd5.5W0.5Mo0.5O11.25-δ samples. For all samples the electrical conductivity values measured in a humid atmosphere (up to ~ 10−3 S/cm at 550 °C) exceed those measured in a dry atmosphere indicating the proton character of conductivity.
AB - Nd5.5WO11.25-δ, (Nd5/6La1/6)5.5WO11.25-δ and Nd5.5W0.5Mo0.5O11.25-δ mixed oxides have been prepared using mechanochemical activation (MA) of Nd2O3-WO3, Nd2O3-La2O3-WO3, Nd2O3-MoO3-WO3 mixtures in a high-power planetary ball mill. Genesis of these tungstates structural properties was studied by XRD, SEM, TEM with EDX analysis, 1H NMR, IR and Raman spectroscopy. X-ray diffraction has revealed that MA results in formation of a pure fluorite structure already after milling. High-density ceramic pellets have been obtained after sintering at 1350 °C. Transport properties of Nd5.5WO11.25-δ mixed oxide were improved by the partial substitution of Nd with La in (Nd5/6La1/6)5.5WO11.25-δ and W with Mo in Nd5.5W0.5Mo0.5O11.25-δ samples. For all samples the electrical conductivity values measured in a humid atmosphere (up to ~ 10−3 S/cm at 550 °C) exceed those measured in a dry atmosphere indicating the proton character of conductivity.
KW - Proton transport
KW - Structure
KW - Synthesis by mechanical activation
KW - Tungstate
KW - STABILITY
KW - LANTHANUM TUNGSTATE
KW - HYDROGEN PERMEATION
KW - SEPARATION
UR - http://www.scopus.com/inward/record.url?scp=85054523703&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2018.09.277
DO - 10.1016/j.ceramint.2018.09.277
M3 - Article
AN - SCOPUS:85054523703
VL - 45
SP - 9529
EP - 9536
JO - Ceramics International
JF - Ceramics International
SN - 0272-8842
IS - 7
ER -
ID: 17028594