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Properties of substance:

hafnium oxide

Group of substances:

inorganic

Physical appearance:

white rhombic crystals

Empirical formula (Hill's system for organic substances):

HfO2

Structural formula as text:

HfO2

Molar/atomic mass: 210.49

Melting point (°C):

2780

Solubility (g/100 g of solvent):

water: 0.0000023 (34.6°C) [Ref.]
water: 0.0000028 (49.7°C) [Ref.]
water: 0.0000029 (60°C) [Ref.]
water: 0.0000032 (70.3°C) [Ref.]
water: 0.0000047 (89.7°C) [Ref.]

Density:

9.68 (20°C, g/cm3)

Standard molar enthalpy (heat) of formation ΔfH0 (298.15 K, kJ/mol):

-1117.5 (s)

Standard molar Gibbs energy of formation ΔfG0 (298.15 K, kJ/mol):

-1061.1 (s)

Standard molar entropy S0 (298.15 K, J/(mol·K)):

59.33 (s)

Molar heat capacity at constant pressure Cp (298.15 K, J/(mol·K)):

60.25 (s)

References:

  1. Новый справочник химика и технолога. Химическое равновесие. Свойства растворов. - СПб.: НПО Профессионал, 2004, 2007. - pp. 207 [Russian]
  2. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 61 [Russian]
  3. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 54-55 [Russian]
  4. Шека И.А., Карлышева К.Ф. Химия гафния. - Киев: Наукова думка, 1973. - pp. 129-154 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru