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CC=Collection Code: [AB2X4]=ANX Form: [cF56]=Pearson: [e d a]=Wyckoff Symbol: [Al2MgO4]=Structure Type:
***Click the ANX, Pearson or Wyckoff Symbol to find structures with that symbol***.
CC=94139 Help
TitleDetermination of structures of Ca2 Co Si2 O7, Ca2 Mg Si2 O7 and Ca2 (Mg0.55 Fe0.45) Si2 O7 in incommensurate and normal phases and observation of diffuse streaks at high temperature.
AuthorsKusaka, K.;Hagiya, K.;Ohmasa, M.;Okano, Y.;Mukai, M.;Iishi, K.;Haga, N.
ReferencePhysics and Chemistry of Minerals (2001) 28, 150-166
Link XRef SCOPUS SCIRUS Google
CompoundCa2 Co1 O7 Si2 - [Akermanite, cobaltian] Dicalcium cobalt disilicate - HT [AB2C2X7] [tP24] [f e3 c a] [Ca2MgSi2O7]
Cell7.8815(5), 7.8815(5), 5.0387(5), 90, 90, 90
P4-21M (113) V=312.99
RemarksR=0.039000 : TEM =773 : TYP =Ca2MgSi2O7 : MIN =Akermanite, cobaltian :

Atom (site) Oxid. x, y, z, B, Occupancy
Co1(2a)2
Ca1(4e)2
Si1(4e)4
O1(2c)-2
O2(4e)-2
O3(8f)-2
0.0.0.1.65(2)1
0.33150(9)0.16850(9)0.5047(2)2.51(2)1
0.1390(1)0.3610(1)0.9364(2)1.33(2)1
0.0.50.824(1)3.0(1)1
0.1404(4)0.3596(4)0.2545(6)2.85(9)1
0.0809(4)0.1892(3)0.7855(5)2.82(9)1
Atom (site) Oxid. Beta11, Beta22, Beta33, Beta12, Beta13, Beta23
Co1(2a)2
Ca1(4e)2
Si1(4e)4
O1(2c)-2
O2(4e)-2
O3(8f)-2
0.00620(5)0.00620(5)0.0185(2)0.0.0.
0.01142(8)0.01142(8)0.0183(2)0.0074(2)0.0050(3)-.0050(3)
0.00583(7)0.00583(7)0.0107(3)0.0012(2)-.0004(3)0.0004(3)
0.0159(5)0.0159(5)0.012(1)0.021(1)0.0.
0.0148(4)0.0148(4)0.0117(8)0.009(1)-.002(1)0.002(1)
0.0187(5)0.0071(3)0.0203(7)-.0080(7)0.010(1)-.004(1)

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