Abstract
In situ high-pressure synchrotron X-ray powder diffraction study of three tunnel manganese oxide minerals (hollandite with 2 × 2 MnO6octahedra tunnels, romanechite with 2 × 3 tunnels, and todorokite with 3 × 3 tunnels) was performed using a diamond anvil cell and nominally penetrating alcohol and water mixture as a pressure-transmitting medium up to ~8 GPa. Bulk moduli (B0)calculated using Murnaghan’s equation of state are inversely proportional to the size of the tunnel, i.e., 134(4) GPa for hollandite (I2/m), 108(2) GPa for romanechite (C2/m), and 67(5) GPa for todorokite (P2/m). On the other hand, axial compressibilities show different elastic anisotropies depending on the size of the tunnel, i.e., $$ \beta_{0}^{a} $$β0a(a/a0)=−0.00066(3) GPa−1, $$ \beta_{0}^{b} $$β0b (b/b0)=0.00179(8) GPa−1,$$ \beta_{0}^{c} $$β0c(c/c0)=0.00637(4) GPa−1[c > b > a]for hollandite;$$\beta_{0}^{a} $$β0a(a/a0)=0.00485(4) GPa−1,$$ \beta_{0}^{b} $$β0b (b/b0)=0.0016(1) GPa−1, $$ \beta_{0}^{c} $$β0c(c/c0)=0.00199(8) GPa−1[a > c > b] for romanechite; and $$ \beta_{0}^{a} $$β0a(a/a0)=0.00826(9)GPa−1,$$ \beta_{0}^{b} $$β0b(b/b0)=0.0054(1)GPa−1, $$ \beta_{0}^{c}$$β0c(c/c0)=0.00081(8) GPa−1[a > b > c] for todorokite.Overall, the degree of tunnel distortion increases with increasing pressure and correlates with the size of the tunnel, which is evidenced by the gradual increases in the monoclinic β angles up to 3 GPa of 0.62°,0.8°, and 1.15° in hollandite, romanechite, and todorokite, respectively. The compression of tunnel manganese oxides is related to the tunnel distortion and the size of the tunnel.
| Original language | English |
|---|---|
| Pages (from-to) | 405-411 |
| Number of pages | 7 |
| Journal | Physics and Chemistry of Minerals |
| Volume | 42 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 2015 May 1 |
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All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Geochemistry and Petrology
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In situ high-pressure synchrotron X-ray powder diffraction study of tunnel manganese oxide minerals : hollandite, romanechite, and todorokite. / Hwang, Gil Chan; Post, Jeffrey E.; Lee, Yongjae.
In: Physics and Chemistry of Minerals, Vol. 42, No. 5, 01.05.2015, p. 405-411.Research output: Contribution to journal › Article
TY - JOUR
T1 - In situ high-pressure synchrotron X-ray powder diffraction study of tunnel manganese oxide minerals
T2 - hollandite, romanechite, and todorokite
AU - Hwang, Gil Chan
AU - Post, Jeffrey E.
AU - Lee, Yongjae
PY - 2015/5/1
Y1 - 2015/5/1
N2 - In situ high-pressure synchrotron X-ray powder diffraction study of three tunnel manganese oxide minerals (hollandite with 2 × 2 MnO6octahedra tunnels, romanechite with 2 × 3 tunnels, and todorokite with 3 × 3 tunnels) was performed using a diamond anvil cell and nominally penetrating alcohol and water mixture as a pressure-transmitting medium up to ~8 GPa. Bulk moduli (B0)calculated using Murnaghan’s equation of state are inversely proportional to the size of the tunnel, i.e., 134(4) GPa for hollandite (I2/m), 108(2) GPa for romanechite (C2/m), and 67(5) GPa for todorokite (P2/m). On the other hand, axial compressibilities show different elastic anisotropies depending on the size of the tunnel, i.e., $$ \beta_{0}^{a} $$β0a(a/a0)=−0.00066(3) GPa−1, $$ \beta_{0}^{b} $$β0b (b/b0)=0.00179(8) GPa−1,$$ \beta_{0}^{c} $$β0c(c/c0)=0.00637(4) GPa−1[c > b > a]for hollandite;$$\beta_{0}^{a} $$β0a(a/a0)=0.00485(4) GPa−1,$$ \beta_{0}^{b} $$β0b (b/b0)=0.0016(1) GPa−1, $$ \beta_{0}^{c} $$β0c(c/c0)=0.00199(8) GPa−1[a > c > b] for romanechite; and $$ \beta_{0}^{a} $$β0a(a/a0)=0.00826(9)GPa−1,$$ \beta_{0}^{b} $$β0b(b/b0)=0.0054(1)GPa−1, $$ \beta_{0}^{c}$$β0c(c/c0)=0.00081(8) GPa−1[a > b > c] for todorokite.Overall, the degree of tunnel distortion increases with increasing pressure and correlates with the size of the tunnel, which is evidenced by the gradual increases in the monoclinic β angles up to 3 GPa of 0.62°,0.8°, and 1.15° in hollandite, romanechite, and todorokite, respectively. The compression of tunnel manganese oxides is related to the tunnel distortion and the size of the tunnel.
AB - In situ high-pressure synchrotron X-ray powder diffraction study of three tunnel manganese oxide minerals (hollandite with 2 × 2 MnO6octahedra tunnels, romanechite with 2 × 3 tunnels, and todorokite with 3 × 3 tunnels) was performed using a diamond anvil cell and nominally penetrating alcohol and water mixture as a pressure-transmitting medium up to ~8 GPa. Bulk moduli (B0)calculated using Murnaghan’s equation of state are inversely proportional to the size of the tunnel, i.e., 134(4) GPa for hollandite (I2/m), 108(2) GPa for romanechite (C2/m), and 67(5) GPa for todorokite (P2/m). On the other hand, axial compressibilities show different elastic anisotropies depending on the size of the tunnel, i.e., $$ \beta_{0}^{a} $$β0a(a/a0)=−0.00066(3) GPa−1, $$ \beta_{0}^{b} $$β0b (b/b0)=0.00179(8) GPa−1,$$ \beta_{0}^{c} $$β0c(c/c0)=0.00637(4) GPa−1[c > b > a]for hollandite;$$\beta_{0}^{a} $$β0a(a/a0)=0.00485(4) GPa−1,$$ \beta_{0}^{b} $$β0b (b/b0)=0.0016(1) GPa−1, $$ \beta_{0}^{c} $$β0c(c/c0)=0.00199(8) GPa−1[a > c > b] for romanechite; and $$ \beta_{0}^{a} $$β0a(a/a0)=0.00826(9)GPa−1,$$ \beta_{0}^{b} $$β0b(b/b0)=0.0054(1)GPa−1, $$ \beta_{0}^{c}$$β0c(c/c0)=0.00081(8) GPa−1[a > b > c] for todorokite.Overall, the degree of tunnel distortion increases with increasing pressure and correlates with the size of the tunnel, which is evidenced by the gradual increases in the monoclinic β angles up to 3 GPa of 0.62°,0.8°, and 1.15° in hollandite, romanechite, and todorokite, respectively. The compression of tunnel manganese oxides is related to the tunnel distortion and the size of the tunnel.
UR - http://www.scopus.com/inward/record.url?scp=84939997059&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84939997059&partnerID=8YFLogxK
U2 - 10.1007/s00269-014-0731-8
DO - 10.1007/s00269-014-0731-8
M3 - Article
VL - 42
SP - 405
EP - 411
JO - Physics and Chemistry of Minerals
JF - Physics and Chemistry of Minerals
SN - 0342-1791
IS - 5
ER -