Table 2 Coefficients of Lattice Parameter Equations a = a0(1 + LT), T in K (1123 to 2323 K) and Mean Linear Thermal Expansion Coefficient (α).

From: Probing disorder in pyrochlore oxides using in situ synchrotron diffraction from levitated solids–A thermodynamic perspective

Composition (phase)

ao (Å)

†α x10−6 (1/K)

R2

‡α x10−6 (1/K)

La1.97(2)Hf2.02(1)O7

10.777(5)

8.78(30)

0.985

8.71(52)

Nd1.94(4)Hf2.05(3)O7

10.628(5)

9.99(29)

0.989

9.88(52)

Sm2.07(6)Hf1.95(5)O7

10.564(3)

10.22(31)

0.988

10.11(34)

Nd1.97(12)Zr2.02(9)O7

10.639(5)

10.78(28)

0.991

10.66(64)

Sm1.98(13)Zr2.02(10)O7

10.579(7)

11.06(40)

0.983

10.93(42)

Eu2.01(8)Zr1.99(10)O7

  Heating (DF-P-DF)

10.524(5)

10.62(25)

0.993

10.50(30)

  Cooling (DF-P)

10.529(8)

10.46(44)

0.980

10.32(15)

Gd1.91(5)Zr2.07(5)O7

  Heating (DF-P-DF)

10.499(6)

10.61(31)

0.990

10.47(23)

  Cooling (DF-P)

10.500(5)

10.79(31)

0.990

10.64(18)

  1. a0 correspond to cell parameter at 298 K, L is thermal expansion coefficient †Corresponds to thermal expansion coefficient at 298 K; ‡Calculated as α = (a(2323K) − a(1123 K))/a(1123K)/1200; number in parenthesis represents the decimal point variation.
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