Crystal chemistry of Eu-bearing tuite synthesized at high-pressure and high-temperature conditions

Shuangmeng Zhai, Hexiong Yang, Weihong Xue, Eugene Huang, Daisuke Yamazaki, Shaunna M. Morrison, Robert T Downs

Research output: Contribution to journalArticle

Abstract

Tuite, γ-Ca3(PO4)2, is a potential host for rare-earth elements in the deep mantle. Eu-bearing tuite single crystals with chemical formulas of Ca2.93Eu0.04(PO4)2 and Ca2.88Eu0.07Na0.06(PO4)2 were synthesized at 16 GPa and 1600 °C, and their structures were investigated at room temperature with single-crystal X-ray diffraction. The structure refinements of Eu-bearing tuite indicate the preference of Eu3+ for the smaller 6-coordinated Ca1 site with a coupled vacancy due to the substitution of 2Eu3+ + □ → 3 Ca2+. In NaEu-bearing tuite, both Eu3+ and Na+ occupy the smaller 6-coordinated Ca1 site according to the coupled substitution of Eu3+ + Na+ → 2 Ca2+. The presence of Na results in more Eu2O3 in NaEu-bearing tuite, because the coupled substitution is energetically more favorable. REE-bearing tuite could be found on the Moon and the deep Earth’s mantle as a consequence of REE-bearing apatite or/and merrillite transformation under high-pressure and high-temperature conditions.

Original languageEnglish (US)
JournalPhysics and Chemistry of Minerals
DOIs
StateAccepted/In press - Jan 1 2018

Fingerprint

Bearings (structural)
Crystal chemistry
crystal chemistry
rare earth element
substitution
crystal
mantle
Substitution reactions
Temperature
apatite
Moon
X-ray diffraction
Single crystals
Apatites
Apatite
Rare earth elements
Vacancies
temperature
Earth (planet)
X ray diffraction

Keywords

  • Crystal structure
  • Eu-bearing
  • Single-crystal X-ray diffraction
  • Tuite
  • γ-Ca(PO)

ASJC Scopus subject areas

  • Materials Science(all)
  • Geochemistry and Petrology

Cite this

Crystal chemistry of Eu-bearing tuite synthesized at high-pressure and high-temperature conditions. / Zhai, Shuangmeng; Yang, Hexiong; Xue, Weihong; Huang, Eugene; Yamazaki, Daisuke; Morrison, Shaunna M.; Downs, Robert T.

In: Physics and Chemistry of Minerals, 01.01.2018.

Research output: Contribution to journalArticle

Zhai, Shuangmeng ; Yang, Hexiong ; Xue, Weihong ; Huang, Eugene ; Yamazaki, Daisuke ; Morrison, Shaunna M. ; Downs, Robert T. / Crystal chemistry of Eu-bearing tuite synthesized at high-pressure and high-temperature conditions. In: Physics and Chemistry of Minerals. 2018.
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AU - Morrison, Shaunna M.

AU - Downs, Robert T

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