ВЫСОКОТЕМПЕРАТУРНОЕ ПОВЕДЕНИЕ СИНТЕТИЧЕСКИХ АНАЛОГОВ СКОТТИИТА BACU2SI2O7 И КОЛИНОВЕНСИТА BACUSI2O6

Результат исследований: Научные публикации в периодических изданияхстатья

2 Цитирования (Scopus)

Аннотация

Analogues of two minerals: scottyite BaCu 2 Si 2 O 7 and colinowensite BaCuSi 2 O 6 , have been synthesized by hydrothermal method. According to the single crystal X-ray diffraction, synthetic analogue of scottyite is orthorhombic, space group Pnma, a = 6.8805(15), b = 13.190(3), c = 6.8903(17) A; analogue of colinowensite is tetragonal, I4 1 /acd, a = 9.9811(2), c = 22.3369(6) A. The high-temperature (HT) X-ray powder diffraction study has shown that both phases are stable within the range of temperature from 26 to 900 °C. Calculated thermal expansion coefficients for scottyite are α a = = 9 10 -6 , α b = 5 10 -6 , α c = 8 10 -6 °C -1 at T = 200 °C; α a = 10 10 -6 , α b = 6 10 -6 , α c = 12 10 -6 °C -1 at T = 400 °C; α a = = 10 10 -6 , α b = 8 10 -6 , α c = 16 10 -6 °C -1 at T = 600 °C, and the main HT deformation of the structure is associated with straightening of chains, built by copper squares, along the c axis. Calculated thermal expansion coefficients for colinowensite are α a = = 10 10 -6 °C -1 , α c = = -5 10 -6 °C -1 at T = 200 °C; α a = 9 10 -6 °C -1 , α c = 5 10 -6 °C -1 at T = 400 °C; α a = 9 10 -6 °C -1 , α c = 15 10 -6 °C -1 at T = 600 °C. The thermal behavior of colinowensite is characterized by contraction of c parameter in the 25-400 °C range of temperature, while in the region 400-900 °C the phase becomes expanded. This high-temperature behavior is interpreted as a stretching of barium polyhedra chains.

Язык оригиналарусский
Страницы (с-по)125-134
Число страниц10
ЖурналZapiski Rossiiskogo Mineralogicheskogo Obshchestva
Том146
Номер выпуска2
СостояниеОпубликовано - 1 янв 2017

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Предметные области Scopus

  • Геохимия и петрология
  • Геология
  • Экономическая геология
  • Химия материалов

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