P 56 Phase Transitions of the NASICON-Type Mixed Phosphates LiM2(PO4)3 (M = Ti, Zr) and LiInNb(PO4)3 / I. Yu. Pinus, A. R. Shaikhlislamova, I. A. Stenina, N. A. Zhuravlev, A. B. Yaroslavtsev // Inorganic Materials. - 2009. - Vol. 45, № 12. - P. 1370-1374 : il. - Bibliogr. : p. 1373-1374 (17 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): ФАЗОВЫЙ ПЕРЕХОД -- ИОНЫ ЛИТИЯ Аннотация: The structural phase transitions of LiTi2(PO4)3, LiInNb(PO4)3, and LiZr2(PO4)3have been studied by X-ray diffraction, impedance spectroscopy, 7Li NMR spectroscopy, and calorimetry. The results indicate that, as the temperature is raised, the lithium ions in the structure of LiTi2(PO4)3 and LiInNb(PO4)3 redistribute between the M1 and M2 sites. The thermal expansion coefficients along the crystallographic axes of LiTi2(PO4)3and LiInNb(PO4)3 are estimated Полный текст |
P 56 Phase Transformations and Cation Mobility in Li3-2xNbxIn2-x(PO4)3 Complex Phosphates / A. R. Shaikhlislamova, I. A. Stenina, N. A. Zhuravlev, I. V. Arkhangel’skii, A. I. Rebrov, A. B. Yaroslavtsev // Russian Journal of Inorganic Chemistry. - 2009. - Vol. 54, № 4. - P500-504 : il. - Bibliogr. : p. 504 (14 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): ФАЗОВЫЙ ПЕРЕХОД -- ФОСФАТЫ Аннотация: Cation mobility in Li3–2xNbxIn2 –x(PO4)3 complex phosphates was studied by impedance spectroscopy, calorimetry, and 7Li NMR spectroscopy. A phase transition at ≈273 K is suggested for compositions containing ≈1mol lithium per formula unit Полный текст |
S 53 Shaikhlislamova, A. R. Li+/H+ Ion Exchange in Li3 – 2xNbxM2 – x(PO4)3 (M = In, Fe) Materials with a NASICON Structure / A. R. Shaikhlislamova, N. A. Zhuravlev, A. B. Yaroslavtsev // Russian Journal of Inorganic Chemistry. - 2010. - Vol. 55, № 1. - P18-22 : il. - Bibliogr. : p. 22 (13 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): ИОННЫЙ ОБМЕН -- ПРОТОННАЯ ПРОВОДИМОСТЬ Аннотация: H3 – 2xNbxM2 – x(PO4)3 (M = In, Fe) acid phosphates have been obtained by ion exchange from their lithium forms and X ray powder diffraction, impedance measurements, and 7Li and 1H NMR spectroscopy. The parameters of the hexagonal unit cell of the proton exchanged forms differ only slightly from those of the initial lithium compounds. According to 1H NMR data, the proton in the acid phosphates is not hydrated. The conductivity of the acid phosphates at high temperatures depends weakly on their composition and is ~1.7 × 10–7 S cm–1 at 620 K. The activation energy of conduction is 30–33 kJ/mol (430–770 K) Полный текст |