Table 1.
a-axis, c-axis lattice constants (a and c), z coordinate of oxygen (z) at 300 K, the linear thermal expansion coefficient [αa (αc)] along a(c)-axis, and αc/αa of O3- and P2-type NaxMO2 at 300 K.
| Compound | a (Å) | c (Å) | z | αa (10−5 K−1) | αc (10−5 K−1) | αc/αa |
|---|---|---|---|---|---|---|
| 56O3-Na0.99CrO2 | † 2.97247(3) | †15.96540(18) | 0.23213(13) | *0.73 | *1.52 | *2.07 |
| 56O3-Na 0.99 FeO 2 | †3.02477(2) | †16.09135(10) | 0.23389(12) | *1.07 | *1.63 | *1.52 |
| O3-Na1.00CoO2 | 2.88627(2) | 15.58680(12) | 0.23046(9) | 0.98 | 1.71 | 1.74 |
| O3-Na0.98Fe0.5Co0.5O2 | 2.94748(3) | 15.93844(23) | 0.23238(12) | 0.79 | 1.37 | 1.73 |
| O3-Na0.99Fe0.5Ni0.5O2 | 2.98463(9) | 15.94545(63) | 0.23334(17) | 1.01 | 1.76 | 1.74 |
| O3-Na0.94Ti0.5Ni0.5O2 | 3.00358(4) | 16.12273(24) | 0.23382(13) | 1.06 | 1.61 | 1.51 |
| 57P2-Na0.52MnO2 | †2.87311(9) | †11.1287(5) | 0.0858(3) | *0.81 | *2.11 | *2.59 |
| 57P2-Na0.59CoO2 | †2.82748(4) | †10.9319(2) | 0.0881(3) | *0.48 | *2.70 | *5.61 |
| P2-Na0.50Mn0.5Co0.5O2 | 2.82459(5) | 11.20617(33) | 0.08704(24) | 0.84 | 2.42 | 2.87 |
| P2-Na0.70Ni0.33Mn0.67O2 | 2.88835(5) | 11.15881(29) | 0.09120(28) | 0.67 | 1.51 | 2.26 |
| P2-Na0.69Ni0.33Mn0.5Ti0.17O2 | 2.90101(3) | 11.12868(16) | 0.09263(17) | 1.07 | 2.20 | 2.05 |
| P2-Na0.70Ni0.33Mn0.33Ti0.34O2 | 2.92173(4) | 11.13896(22) | 0.09381(21) | 1.12 | 2.72 | 2.42 |
| P2-Na0.48Mn0.5Fe0.5O2 | 2.92452(8) | 11.24690(48) | 0.08592(32) | 1.30 | 2.26 | 1.74 |