Hydrogen Isotope Research Center - Toyama Univ.


Data Base for Tritium Solid Breeding Materials (Li2O, Li2TiO3, Li2ZrO3 and Li4SiO4) of Fusp

5. Database for Li2TiO3(β)

5.1 Physical and thermal properties

5.1.1 Crystalline structure

No. Data and remark Fig. Refs.
1 Monoclinic : Sintered at 1050°C, 3hr : 0.95 Li2TiO3 TD - 6, 50
Notes1 Phase change temp. : 1150°C (β→γ) - -

5.1.2 Molecular weight (g/g-mol)

No. Data and remark Fig. Refs.
1 109.93(1–1.82×10-2δ)     δ=6Li fraction in Li - 8, 50, 51

5.1.3 Density and Li density (g/cm3)

No. Data and remark Fig. Refs.
1 3.44 (1–1.82×10-2δ)     δ= 6Li fraction in Li - 8, 51
2 2.0(α), 3.43(β), 2.57(γ) : α=cubic, β=monoclinic, γ=cubic - 50, 51
Notes1 Li density (g/cm3) :     0.37δ for 6Li ,     0.44(1–δ) for 7Li - 8

5.1.4 Melting point (°C)

No. Data and remark Fig. Refs.
1 1535°C - 8
2 1535°C (Li/Ti = 2.0, 100%TD) - 51

5.1.5 Thermal conductivity (W/m-K)

No. Data and remark Fig. Refs.
1 2     (1000K, 85%TD) - 6
2 1.955     (Li/Ti = 1.9, 80%TD, 500°C) - 51
3 3.258(1–2p)    monoclinic, p : porosity(0.1~0.3) - 51
4 κ=(1–p)2.9(5.35–4.78×10-3T+2.87×10-6T2)
    0.14≦p (porosity)≦0.25, 400≦T≦1400K		 - 8, 64, 50, 52
5 Pebble bed thermal conductivity, (W/m-K)
κ=(1–p)[0.74+0.00015(T–273)+3.3×10-7(T–273)2]/0.52
    0.7~1.2 mm diameter pebble, 0.1 MPa He
    0.4314≦p (smear porosity)≦0.48, 300≦T≦300K		 - 53, 6
Notes1 The thermal conductivity data for Li2TiO3. 5.1 27, 28, 92

5.1.6 Thermal expansion

No. Data and remark Fig. Refs.
1 Linear expansion, (%), from 293K
ΔL/L0=–0.4119+1.154×10-3T+5.505×10-7T2		 - 50
2 Instantaneous coef., (1/K)
α=1.154×10-5×1.101×10-8T		 - 50
3 Mean coef., (1/K), from 293K
αm= (–0.004119+1.154×10-5T+5.505×10-9T2)/(T–293)
    373≦T≦1073K		 - 50
4 16×10-6 (1/K) - 6
5 21×10-6 (1/K, Li/Ti = 1.9, 80%TD) - 50

5.1.7 Specific heat (kJ/kg-K)

No. Data and remark Fig. Refs.
1 Cp = 355(T–100)1.1/(1+0.3 T1.05), (kJ/kg-K)
    300≦T≦1400K		 - 8, 54, 55, 28
2 1.0 kJ/kg-K, (300K) - 50, 52
Notes1 Specific heat data for Li2TiO3. The dotted curve is fitting curve. 5.2 28

5.1.8 Heat capacity (J/mol.-K)

No. Data and remark Fig. Refs.
1 1428 J/kg-K, (Li/Ti = 1.9, 80%TD, 500°C) - 50

5.1.9 Vapor pressure

No. Data and remark Fig. Refs.
1 Temperature at which total lithium vapor pressure is 0.01 Pa, (K)
K=839+[305+87.3 log100P(D2O)]–78.3 logP(D2)/[1+2.55×10-10log100P(D2O)18.6]
    10≦P(D2)≦1000 Pa, 0.01≦P(D2O)≦100 Pa
    P(D2) : partial pressure of D2.		 - 57, 58, 59, 60

5.1.10 Thermal diffusivity (10-6m2/s)

No. Data and remark Fig. Refs.
1 α=5.16×10-7m2/s, 80%TD, 500°C, Li/Ti = 1.9
    From 6.45(1–p)×10-7m2/s, p : porosity		 - 50, 28
2 Measured thermal diffusivity of 80% dense Li2TiO3. 5.3 92, 28

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