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Table 2 Evolution of crystalline phases with temperature in Mg x Cu 3-x V 2 O 8 (0 ≤ x ≤ 3) samples

From: Structural characterization and colour of MgxCu3-xV2O8 (0 ≤ x ≤ 3) and MgyCu2-yV2O7 (0 ≤ y ≤ 2) compositions

x

T (°C)

Crystalline phases

0.00

300

C2(s), C1(vw)

0.50

300

C2(s), MT(w), C1(vw)

1.00

300

CM(m), M(w), C2(vw)

1.50

300

CM(m)

2.00

300

M(m), CM(w)

2.50

300

M(m), MT(w)

3.00

300

M(m), MT(w)

0.00

600

CT(s), C1(m), C2(m)

0.50

600

CT(m), C2(w), M(vw), C1(vw)

1.00

600

CT(m), M(m), C2(w), MO(w), CM(vw)

1.50

600

CM(m)

2.00

600

CM(m), MO(w)

2.50

600

MO(m), M(vw)

3.00

600

MO(m), M(w)

1.00

800

MC(s)

1.50

800

CM(s), MC(s), C2(vw)

2.00

800

CM(s)

2.50

800

MO(s), M(vw)

3.00

800

MO(s), MT(w)

1.00

1000

MO(m), CM(w), M(vw)

1.50

1000

MO(m), CM(w), M(w)

2.00

1000

MO(m), M(w), MC(vw), CT(vw)

2.50

1000

MO(s), MT(vw)

3.00

1000

MO(s), MT(w)

  1. Crystalline phases: CT = Cu3V2O8 (triclinic), CM = Cu3V2O8 (monoclinic), MC = MgCu2V2O8 (monoclinic), MO = Mg3V2O8 (orthorhombic), C1 = α-Cu2V2O7 (orthorhombic), C2 = β-Cu2V2O7 (monoclinic), C3 = γ-Cu2V2O7 (triclinic), M = α-Mg2V2O7 (monoclinic), MT = Mg2V2O7 (triclinic).
  2. Diffraction peak intensity: s = strong, m = medium, w = weak, vw = very weak.