Woodruffite: A new Mn oxide structure with 3 X 4 tunnels

Jeffrey E. Post; Peter J. Heaney; Christopher L. Cahill; Larry W. Finger

doi:10.2138/am-2003-11-1209

Woodruffite: A new Mn oxide structure with 3 X 4 tunnels

Jeffrey E. Post, Peter J. Heaney, Christopher L. Cahill, Larry W. Finger

Research output: Contribution to journal › Article › peer-review

18 Scopus citations

Abstract

The mineral woodruffite, Zn²⁺_x/2 (Mn⁴⁺_1-x Mn³⁺_x O₂·_yH₂O, x ∼ 0.4 and y ∼ 0.7, is the first known example of a new type of Mn oxide characterized by large tunnels that measure 3 and 4 octahedra (6.9 × 9.2 Å on a side. These tunnels are rectangular in cross-section and are the largest of any yet reported in natural or synthetic Mn oxides. The thermal stability of woodruffite is comparable to that of todorokite and other large-tunnel Mn oxide phases, breaking down at ∼300 °C and eventually transforming to a spinel-type structure. The woodruffite structure may serve as a model for a new class of octahedral molecular sieves with enhanced capabilities as catalysts and selective cation-exchange agents.

Original language	English (US)
Pages (from-to)	1697-1702
Number of pages	6
Journal	American Mineralogist
Volume	88
Issue number	11-12 PART 1
DOIs	https://doi.org/10.2138/am-2003-11-1209
State	Published - 2003

All Science Journal Classification (ASJC) codes

Geophysics
Geochemistry and Petrology

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title = "Woodruffite: A new Mn oxide structure with 3 X 4 tunnels",

abstract = "The mineral woodruffite, Zn2+x/2 (Mn4+1-x Mn3+x O2·yH2O, x ∼ 0.4 and y ∼ 0.7, is the first known example of a new type of Mn oxide characterized by large tunnels that measure 3 and 4 octahedra (6.9 × 9.2 {\AA} on a side. These tunnels are rectangular in cross-section and are the largest of any yet reported in natural or synthetic Mn oxides. The thermal stability of woodruffite is comparable to that of todorokite and other large-tunnel Mn oxide phases, breaking down at ∼300 °C and eventually transforming to a spinel-type structure. The woodruffite structure may serve as a model for a new class of octahedral molecular sieves with enhanced capabilities as catalysts and selective cation-exchange agents.",

author = "Post, {Jeffrey E.} and Heaney, {Peter J.} and Cahill, {Christopher L.} and Finger, {Larry W.}",

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T1 - Woodruffite

T2 - A new Mn oxide structure with 3 X 4 tunnels

AU - Post, Jeffrey E.

AU - Heaney, Peter J.

AU - Cahill, Christopher L.

AU - Finger, Larry W.

PY - 2003

Y1 - 2003

N2 - The mineral woodruffite, Zn2+x/2 (Mn4+1-x Mn3+x O2·yH2O, x ∼ 0.4 and y ∼ 0.7, is the first known example of a new type of Mn oxide characterized by large tunnels that measure 3 and 4 octahedra (6.9 × 9.2 Å on a side. These tunnels are rectangular in cross-section and are the largest of any yet reported in natural or synthetic Mn oxides. The thermal stability of woodruffite is comparable to that of todorokite and other large-tunnel Mn oxide phases, breaking down at ∼300 °C and eventually transforming to a spinel-type structure. The woodruffite structure may serve as a model for a new class of octahedral molecular sieves with enhanced capabilities as catalysts and selective cation-exchange agents.

AB - The mineral woodruffite, Zn2+x/2 (Mn4+1-x Mn3+x O2·yH2O, x ∼ 0.4 and y ∼ 0.7, is the first known example of a new type of Mn oxide characterized by large tunnels that measure 3 and 4 octahedra (6.9 × 9.2 Å on a side. These tunnels are rectangular in cross-section and are the largest of any yet reported in natural or synthetic Mn oxides. The thermal stability of woodruffite is comparable to that of todorokite and other large-tunnel Mn oxide phases, breaking down at ∼300 °C and eventually transforming to a spinel-type structure. The woodruffite structure may serve as a model for a new class of octahedral molecular sieves with enhanced capabilities as catalysts and selective cation-exchange agents.

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Woodruffite: A new Mn oxide structure with 3 X 4 tunnels

Abstract

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