Nonstoichiometry in the systems Na2MoO4–MMoO4 (M = Co, Cd), crystal structures of Na3.36Co1.32(MoO4)3, Na3.13Mn1.43(MoO4)3 and Na3.72Cd1.14(MoO4)3, crystal chemistry, compositions and ionic conductivity of alluaudite-type double molybdates and tungstates

Sergey F. Solodovnikov, Zoya A. Solodovnikova, Evgeniya S. Zolotova, Vasiliy N. Yudin, Oksana A. Gulyaeva, Yunna L. Tushinova, Boris M. Kuchumov

Результат исследования: Научные публикации в периодических изданияхстатья

19 Цитирования (Scopus)

Аннотация

As results of a powder XRD study of sintered samples of the systems Na2MoO4–MMoO4 (M = Co, Cd) quenched in air from 873 K, the literature data on the phase formation and homogeneity ranges of nonstoichiometric double molybdates in these systems were corrected. The compounds are monoclinic alluaudite-type Na4-2xCo1+x(MoO4)3 (0.05 ≤ x ≤ 0.30) and Na4-2xCd1+x(MoO4)3 (0.10 ≤ x ≤ 0.40), orthorhombic lyonsite-type Na2-2yCo2+y(MoO4)3 (0.05 ≤ y ≤ 0.25), and triclinic Na2-2zCo2+z(MoO4)3 (0.10 ≤ z ≤ 0.40) of the Na2Mg5(MoO4)6 type. The temperature of the orthorhombic-to-triclinic phase transition was found to be 943 ± 10 K. Crystal structures of the alluaudite-type double molybdates (space group C2/c, Z = 4) with cobalt, manganese, and cadmium were determined. According to the atomic position occupations, the compositions for the crystals were found as Na3.36Co1.32(MoO4)3 (a = 12.6381(3), b = 13.4888(4), c = 7.1244(2) Å, β = 112.127(1)° R = 0.0207), Na3.13Mn1.43(MoO4)3 (a = 12.7387(3), b = 13.6716(4), c = 7.1904(2) Å, β = 112.404(1)°, R = 0.0166), and Na3.72Cd1.14(MoO4)3 (a = 12.804(3), b = 13.913(3), c = 7.326(2) Å, β = 112.63(1)° R = 0.0158). The crystal chemistry and compositions of the alluaudite-type molybdates and tungstates were considered and mainly one-dimensional character of the sodium-ion transport was shown for them. The measured values of the ionic conductivity of sintered samples of Na3.6M1.2(MoO4)3 (M = Mg, Ni, Zn, Cd) and Na3.6Mg1.2(WO4)3 exceeds 10−3 S cm−1 at 673 K.

Язык оригиналаанглийский
Страницы (с-по)121-128
Число страниц8
ЖурналJournal of Solid State Chemistry
Том253
DOI
СостояниеОпубликовано - 1 сен 2017

Fingerprint Подробные сведения о темах исследования «Nonstoichiometry in the systems Na<sub>2</sub>MoO<sub>4</sub>–MMoO<sub>4</sub> (M = Co, Cd), crystal structures of Na<sub>3.36</sub>Co<sub>1.32</sub>(MoO<sub>4</sub>)<sub>3</sub>, Na<sub>3.13</sub>Mn<sub>1.43</sub>(MoO<sub>4</sub>)<sub>3</sub> and Na<sub>3.72</sub>Cd<sub>1.14</sub>(MoO<sub>4</sub>)<sub>3</sub>, crystal chemistry, compositions and ionic conductivity of alluaudite-type double molybdates and tungstates». Вместе они формируют уникальный семантический отпечаток (fingerprint).

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