TY - JOUR

T1 - ВЫСОКОТЕМПЕРАТУРНОЕ ПОВЕДЕНИЕ СИНТЕТИЧЕСКИХ АНАЛОГОВ СКОТТИИТА BACU2SI2O7 И КОЛИНОВЕНСИТА BACUSI2O6

AU - Shapenkov, S. V.

AU - Zolotarev, A. A.

AU - Zhitova, E. S.

AU - Krivovichev, S. V.

AU - Krzhizhanovskaya, M. G.

PY - 2017/1/1

Y1 - 2017/1/1

N2 - 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.

AB - 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.

KW - Colinowensite

KW - Crystal structure

KW - Scottyite

KW - Thermal expansion

KW - X-ray diffraction

UR - http://www.scopus.com/inward/record.url?scp=85035143425&partnerID=8YFLogxK

M3 - статья

AN - SCOPUS:85035143425

VL - 146

SP - 125

EP - 134

JO - ЗАПИСКИ РОССИЙСКОГО МИНЕРАЛОГИЧЕСКОГО ОБЩЕСТВА

JF - ЗАПИСКИ РОССИЙСКОГО МИНЕРАЛОГИЧЕСКОГО ОБЩЕСТВА

SN - 0869-6055

IS - 2

ER -