10 Citations (Scopus)

Abstract

We discovered a new CaGe2O5 polymorph in high-pressure experiments (above 8 GPa). The phase is orthorhombic, space group Pbam, with a = 7.306(2), b = 8.268(2), c = 5.714(1) Å, V = 345.2(1) Å3, and Z = 4. The new phase, which we call post-titanite CaGe2O5, is the high-pressure polymorph of titanite CaGe2O5. The structure of this new polymorph is based on a network of 5- and 6-coordinated Ge polyhedra and 8-coordinated Ca atoms. Following the germanate analog to silicate, post-titanite CaSi2O5 could be expected to form at high-pressure conditions and thus might exist in Earth's mantle.

Original languageEnglish (US)
Pages (from-to)441-443
Number of pages3
JournalAmerican Mineralogist
Volume92
Issue number2-3
DOIs
StatePublished - Feb 2007

Fingerprint

Germanium
germanium
titanite
Polymorphism
Silicates
polyhedrons
silicates
Earth mantle
silicate
Earth (planet)
analogs
mantle
Atoms
atoms
experiment
Experiments

Keywords

  • 5- and 6-coordinated Ge
  • CaGeO polymorph
  • Earth's mantle
  • Post-titanite

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

A new high-pressure CaGe2O5 polymorph with 5- and 6-coordinated germanium. / Németh, Péter; Leinenweber, Kurt; Groy, Thomas L.; Buseck, P R.

In: American Mineralogist, Vol. 92, No. 2-3, 02.2007, p. 441-443.

Research output: Contribution to journalArticle

@article{4d5cb6e3077945b992685e61655389ad,
title = "A new high-pressure CaGe2O5 polymorph with 5- and 6-coordinated germanium",
abstract = "We discovered a new CaGe2O5 polymorph in high-pressure experiments (above 8 GPa). The phase is orthorhombic, space group Pbam, with a = 7.306(2), b = 8.268(2), c = 5.714(1) {\AA}, V = 345.2(1) {\AA}3, and Z = 4. The new phase, which we call post-titanite CaGe2O5, is the high-pressure polymorph of titanite CaGe2O5. The structure of this new polymorph is based on a network of 5- and 6-coordinated Ge polyhedra and 8-coordinated Ca atoms. Following the germanate analog to silicate, post-titanite CaSi2O5 could be expected to form at high-pressure conditions and thus might exist in Earth's mantle.",
keywords = "5- and 6-coordinated Ge, CaGeO polymorph, Earth's mantle, Post-titanite",
author = "P{\'e}ter N{\'e}meth and Kurt Leinenweber and Groy, {Thomas L.} and Buseck, {P R}",
year = "2007",
month = "2",
doi = "10.2138/am.2007.2411",
language = "English (US)",
volume = "92",
pages = "441--443",
journal = "American Mineralogist",
issn = "0003-004X",
publisher = "Mineralogical Society of America",
number = "2-3",

}

TY - JOUR

T1 - A new high-pressure CaGe2O5 polymorph with 5- and 6-coordinated germanium

AU - Németh, Péter

AU - Leinenweber, Kurt

AU - Groy, Thomas L.

AU - Buseck, P R

PY - 2007/2

Y1 - 2007/2

N2 - We discovered a new CaGe2O5 polymorph in high-pressure experiments (above 8 GPa). The phase is orthorhombic, space group Pbam, with a = 7.306(2), b = 8.268(2), c = 5.714(1) Å, V = 345.2(1) Å3, and Z = 4. The new phase, which we call post-titanite CaGe2O5, is the high-pressure polymorph of titanite CaGe2O5. The structure of this new polymorph is based on a network of 5- and 6-coordinated Ge polyhedra and 8-coordinated Ca atoms. Following the germanate analog to silicate, post-titanite CaSi2O5 could be expected to form at high-pressure conditions and thus might exist in Earth's mantle.

AB - We discovered a new CaGe2O5 polymorph in high-pressure experiments (above 8 GPa). The phase is orthorhombic, space group Pbam, with a = 7.306(2), b = 8.268(2), c = 5.714(1) Å, V = 345.2(1) Å3, and Z = 4. The new phase, which we call post-titanite CaGe2O5, is the high-pressure polymorph of titanite CaGe2O5. The structure of this new polymorph is based on a network of 5- and 6-coordinated Ge polyhedra and 8-coordinated Ca atoms. Following the germanate analog to silicate, post-titanite CaSi2O5 could be expected to form at high-pressure conditions and thus might exist in Earth's mantle.

KW - 5- and 6-coordinated Ge

KW - CaGeO polymorph

KW - Earth's mantle

KW - Post-titanite

UR - http://www.scopus.com/inward/record.url?scp=33947192633&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33947192633&partnerID=8YFLogxK

U2 - 10.2138/am.2007.2411

DO - 10.2138/am.2007.2411

M3 - Article

AN - SCOPUS:33947192633

VL - 92

SP - 441

EP - 443

JO - American Mineralogist

JF - American Mineralogist

SN - 0003-004X

IS - 2-3

ER -