Raman spectra and X-ray diffraction of merrillite at various temperatures

被引：11

作者：

Jia, Muhua ^{[1
,2
]}

Zhai, Kuan ^{[1
,2
]}

Gao, Mei ^{[3
]}

Wen, Wen ^{[3
]}

Liu, Yungui ^{[4
]}

Wu, Xiang ^{[4
]}

Zhai, Shuangmeng ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Geochem, Key Lab High Temp & High Pressure Study Earths In, Guiyang 550081, Guizhou, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[3] Chinese Acad Sci, Shanghai Adv Res Inst, SSRF, Shanghai 201210, Peoples R China

[4] China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Hubei, Peoples R China

来源：

VIBRATIONAL SPECTROSCOPY | 2020年 / 106卷

基金：

中国国家自然科学基金;

关键词：

Merrillite; High-temperature; Raman spectra; X-ray diffraction; Thermal expansion; Gruneisen parameter; CRYSTAL-CHEMISTRY; THERMAL-EXPANSION; HIGH-PRESSURE; APATITE; WHITLOCKITE; MINERALS; CRYSTALLIZATION; SPECTROSCOPY; PHOSPHATE; METEORITE;

D O I：

10.1016/j.vibspec.2019.103005

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The Raman spectra and in-situ X-ray diffraction patterns of synthetic merrillite, Ca9NaMg(PO4)(7), have been measured up to 1173 K at ambient pressure. No phase transformation was observed in this study. The effect of temperature on the Raman spectra shows that all observed active bands continuously shift to lower wavenumber with increasing temperature. The temperature dependences of v(3) anti-symmetric PO stretching modes are larger than those of v(1) symmetric P-O stretching, v(4) and v(2) O-P-O bending modes and the external modes. Lattice parameters and volume were analyzed, and the thermal expansion coefficients were obtained as 4.86(5) x 10(-5) K-1, 1.46(1) x 10(-5) K-1 and 1.94(5) x 10(-5) K-1 for V, a and c, respectively. Thermal expansion of merrillite shows an axial anisotropy with a smaller expansion coefficient along the alpha-axis. The average isobaric mode Gruneisen parameter for the internal PO4 modes of merrillite has been calculated as 0.57.

引用

页数：5

共 44 条

[1] Adcock CT, 2013, NAT GEOSCI, V6, P824, DOI [10.1038/NGEO1923, 10.1038/ngeo1923]
[2] Synthesis and characterization of the Mars-relevant phosphate minerals Fe- and Mg-whitlockite and merrillite and a possible mechanism that maintains charge balance during whitlockite to merrillite transformation
Adcock, Christopher T.
Hausrath, Elisabeth M.
Forster, Paul M.
Tschauner, Oliver
Sefein, Kirellos J.
[J]. AMERICAN MINERALOGIST, 2014, 99 (07) : 1221 - 1232
[3] Raman spectroscopic study of the phase transitions sequence in Li3Fe2(PO4)3 and Na3Fe2(PO4)3 at high temperature
Bih, H.
Bih, L.
Manoun, B.
Azdouz, M.
Benmokhtar, S.
Lazor, P.
[J]. JOURNAL OF MOLECULAR STRUCTURE, 2009, 936 (1-3) : 147 - 155
[4] Brunet F, 1999, EUR J MINERAL, V11, P1023
[5] CAMERON M, 1973, AM MINERAL, V58, P594
[6] Phase Transitions and Thermal Expansion of Apatite-Structured Compounds
Chernorukov, N. G.
Knyazev, A. V.
Bulanov, E. N.
[J]. INORGANIC MATERIALS, 2011, 47 (02) : 172 - 177
[7] CROZAZ G, 1985, METEORITICS, V20, P629
[8] The phase transition sequence in tetramethylammonium cadmium chloride (TMCC): [N(CH3)(4)]CdCl3
DiazHernandez, J
AguirreZamalloa, G
LopezEcharri, A
RuizLarrea, I
Breczewski, T
Tello, MJ
[J]. JOURNAL OF PHYSICS-CONDENSED MATTER, 1997, 9 (16) : 3399 - 3415
[9] DIETRICH P, 1982, HIGH PRESSURE RES GE, P307
[10] The Severny Kolchim Meteorite: New Data on Mineralogy
Erokhin, Yu. V.
Koroteev, V. A.
Khiller, V. V.
Ivanov, K. S.
Kleimenov, D. A.
[J]. DOKLADY EARTH SCIENCES, 2018, 482 (01) : 1189 - 1192

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