Formula

Lattice parameters

a.e.>

Remark

a(Å)

c(Å)

BaCuO2

3.90?

4.08

1.42

highly strained

BaCuO2

3.96

3.96*)

1.42

fictive values

Ba0.5Sr0.5CuO2

3.92 (3.94)

2・3.965

1.34

orthorhombic

Ba0.33Sr0.67CuO2

3.93

3.477

1.3133

SrCuO2

3.926

3.432

1.26

(Sr0.7Ca0.3)0.9CuO2

3.902

3.350

1.218

Tc = 110 K (p-type)

Sr0.33Ca0.67CuO2

3.878

3.259

1.167

Sr0.14Ca0.86CuO2

3.861

3.200

1.1396

prototypic compound

Sr0.09Ca0.91CuO2

3.858

3.20

1.1326

CaCuO2

3.85

3.17

1.12

extrapolated parameters

Ca0.98CuO2

3.856

3.181

1.12

high gas-pressure synthesis

S0.84Nd0.16CuO2

3.942

3.38

Tc = 43 K (n-type)