Zobrazeno 1 - 10
of 170
pro vyhledávání: '"Ramiza K. Rastsvetaeva"'
Publikováno v:
Minerals, Vol 10, Iss 8, p 720 (2020)
The review considers various complex mechanisms of isomorphism in the eudialyte-group minerals, involving both key positions of the heteropolyhedral framework and extra-framework components. In most cases, so-called blocky isomorphism is realized whe
Externí odkaz:
https://doaj.org/article/cf2c39c1c57b4855a8cb25960b2c29bf
Autor:
Ramiza K. Rastsvetaeva, Nikita V. Chukanov, Igor V. Pekov, Christof Schäfer, Konstantin V. Van
Publikováno v:
Minerals, Vol 10, Iss 7, p 587 (2020)
A review of the crystal chemistry of Fe-deficient eudialyte-group minerals is given. Specific features of cation distribution over key sites in the crystal structure, including partial substitution of Fe2+ with Na, Mn and Zr at the M2 site are discus
Externí odkaz:
https://doaj.org/article/6e9b2508b4e24e1698ff0b7fdb3db551
Autor:
Nikita V. Chukanov, Marina F. Vigasina, Ramiza K. Rastsvetaeva, Sergey M. Aksenov, Julia A. Mikhailova, Igor V. Pekov
Publikováno v:
Journal of Raman Spectroscopy. 53:1188-1203
Autor:
Ramiza K. Rastsvetaeva, Anastasia D. Ryanskaya, Nikolay V. Vladykin, S. L. Votyakov, Sergey M. Aksenov, Nikita V. Chukanov, Yuliya V. Shchapova
Publikováno v:
Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials. 77:287-298
Specific features of the crystal chemistry of lamprophyllite-group minerals (LGMs) are discussed using the available literature data and the results of the single-crystal X-ray diffraction and a Raman spectroscopic studies of several samples taken fr
Publikováno v:
Crystallography Reports. 66:112-119
The crystal structure and crystallochemical features of Fe-deficient manganese-rich eudialyte from the Khibiny massif (Kola Peninsula) have been investigated by X-ray diffraction analysis, electron probe microanalysis, and IR spectroscopy. The trigon
Publikováno v:
Crystallography Reports. 66:120-125
An intermediate member of the raslakite–sergevanite solid-solution series has been investigated by X-ray diffraction analysis, electron probe microanalysis, and IR spectroscopy. The trigonal unit-cell parameters of the mineral are found to be a = 1
Publikováno v:
Crystallography Reports. 65:704-710
A potentially new calcium-rich eudialyte-group mineral from the Khibiny massif has been investigated by X-ray diffraction (XRD) analysis. The trigonal unit-cell parameters are found to be as follows: a = 14.221(1) A, c = 30.04(1) A, and V = 5261.3 A3
Publikováno v:
Crystallography Reports. 65:554-559
An intermediate member of the eudialyte–sergevanite solid-solution series has been investigated by X-ray diffraction analysis, electron probe microanalysis, and IR spectroscopy. The trigonal unit-cell parameters of the mineral are found to be a = 1
Publikováno v:
Crystallography Reports. 65:422-427
A new niobium-rich lomonosovite variety with a high degree of ordering of Ti and Nb atoms has been investigated by X-ray diffraction analysis and electron probe microanalysis. Its simplified formula is Na10Ti2(Nb,Fe,Ti)2(Si2O7)2(PO4)2O4. The triclini
Publikováno v:
Crystallography Reports. 65:215-222
An eudialyte-group representative containing S2– sulfide anion has been investigated by X-ray diffraction analysis, electron-probe microanalysis, and IR spectroscopy. The unit-cell parameters are found to be a = 14.2156(3) A, c = 30.405(1) A, and V