Monoclinic PZT [Pb(ZrxTi1–x)O3] Structure: A3BC_mC10_8_ab_a_a
| Prototype | : | Pb(Zr0.52Ti0.48)O3 |
| AFLOW prototype label | : | A3BC_mC10_8_ab_a_a |
| Strukturbericht designation | : | None |
| Pearson symbol | : | mC10 |
| Space group number | : | 8 |
| Space group symbol | : | $\mbox{Cm}$ |
| AFLOW prototype command | : | aflow --proto=A3BC_mC10_8_ab_a_a --params=$a,b/a,c/a,\beta,x_{1},z_{1},x_{2},z_{2},x_{3},z_{3},x_{4},y_{4},z_{4}$ |
- This is a monoclinic ferroelectric distortion of the perovskite structure. In Pb(ZrxTi1–x)O3 (aka PZT) it is found only when $x=0.52$. Although the second (2a) site is nearly equally occupied by Zr and Ti atoms, the pictures use Zr atoms. Compare this to the tetragonal PZT structure.
Base-centered Monoclinic primitive vectors:
\[
\begin{array}{ccc}
\mathbf{a}_1 & = & \frac12 \, a \, \mathbf{\hat{x}} - \frac12 \, b \, \mathbf{\hat{y}} \\
\mathbf{a}_2 & = & \frac12 \, a \, \mathbf{\hat{x}} + \frac12 \, b \, \mathbf{\hat{y}} \\
\mathbf{a}_3 & = & c \cos\beta \, \mathbf{\hat{x}} + c \sin\beta \, \mathbf{\hat{z}}
\end{array}
\]
Basis vectors:
\[ \begin{array}{ccccccc} & & \mbox{Lattice Coordinates} & & \mbox{Cartesian Coordinates} &\mbox{Wyckoff Position} & \mbox{Atom Type} \\ \mathbf{B}_{1} & =& x_{1} \, \mathbf{a}_{1} + x_{1} \, \mathbf{a}_{2} + z_{1} \, \mathbf{a}_{3}& =& \left(x_{1} \, a + z_{1} \, c \, \cos\beta\right) \, \mathbf{\hat{x}}+ z_{1} \, c \, \sin\beta \, \mathbf{\hat{z}}& \left(2a\right) & \mbox{O I} \\ \mathbf{B}_{2} & =& x_{2} \, \mathbf{a}_{1} + x_{2} \, \mathbf{a}_{2} + z_{2} \, \mathbf{a}_{3}& =& \left(x_{2} \, a + z_{2} \, c \, \cos\beta\right) \, \mathbf{\hat{x}}+ z_{2} \, c \, \sin\beta \, \mathbf{\hat{z}}& \left(2a\right) & \mbox{Pb} \\ \mathbf{B}_{3} & =& x_{3} \, \mathbf{a}_{1} + x_{3} \, \mathbf{a}_{2} + z_{3} \, \mathbf{a}_{3}& =& \left(x_{3} \, a + z_{3} \, c \, \cos\beta\right) \, \mathbf{\hat{x}}+ z_{3} \, c \, \sin\beta \, \mathbf{\hat{z}}& \left(2a\right) & \mbox{Zr} \\ \mathbf{B}_{4} & =& \left(x_{4} - y_{4}\right) \, \mathbf{a}_{1} + \left(x_{4} + y_{4}\right) \, \mathbf{a}_{2} + z_{4} \, \mathbf{a}_{3}& =& \left(x_{4} \, a + z_{4} \, c \, \cos\beta\right) \, \mathbf{\hat{x}}+ y_{4} \, b \, \mathbf{\hat{y}}+ z_{4} \, c \, \sin\beta \, \mathbf{\hat{z}}& \left(4b\right) & \mbox{O II} \\ \mathbf{B}_{5} & =& \left(x_{4} + y_{4}\right) \, \mathbf{a}_{1} + \left(x_{4} - y_{4}\right) \, \mathbf{a}_{2} + z_{4} \, \mathbf{a}_{3}& =& \left(x_{4} \, a + z_{4} \, c \, \cos\beta\right) \, \mathbf{\hat{x}}- y_{4} \, b \, \mathbf{\hat{y}}+ z_{4} \, c \, \sin\beta \, \mathbf{\hat{z}}& \left(4b\right) & \mbox{O II} \\ \end{array} \]References
- B. Noheda, J. A. Gonzalo, L. E. Cross, R. Guo, S.–E. Park, D. E. Cox, and G. Shirane, Tetragonal–to–monoclinic phase transition in a ferroelectric perovskite: The structure of PbZr0.52Ti0.48O3, Phys. Rev. B 61, 8687–8695 (2000), doi:10.1103/PhysRevB.61.8687.