Table 1 Thermal conductivities and optical lifetimes of single and multicomponent rare earth oxides as well as the wavenumber and wavenumber redshift of the strongest IR modes

	Thermal conductivity (W m⁻¹ K⁻¹)	Lifetime (fs)	Wavenumber (cm⁻¹)	\({{\Delta }}\)Wavenumber redshift (cm⁻¹)
Y₂O₃	10.0 ± 0.9	1098.2 ± 77.3	301, 332, 370	n/a
Ho₂O₃	6.1 ± 0.8	539.9 ± 106.9	282, 320, 359	19, 12, 11
Er₂O₃	5.9 ± 0.7	600.2 ± 130.1	287, 326, 365	14, 6, 5
Yb₂O₃	5.4 ± 0.7	427.2 ± 29.0	291, 329, 363	10, 3, 7
(Y_0.33Yb_0.33Er_0.33)₂O₃	3.3 ± 0.4	356.5 ± 74.8	293, 330, 367	8, 2, 3
(Y_0.2Yb_0.2Er_0.2Ho_0.2Nd_0.2)₂O₃	3.2 ± 0.4	215.3 ± 27.7	281, 318, 354	20, 14, 16
(Y_0.33Yb_0.33Er_0.33)₂O₃ + 16 at.% La₂O₃^a	2.7 ± 0.4	248.8 ± 13.4	286, 325, 358	15, 7, 12
(Y_0.33Yb_0.33Er_0.33)₂O₃ + 16 at.% CeO₂^a	2.3 ± 0.2	181.3 ± 32.8	280, 318, 358	21, 14, 12
Er₂Zr₂O₇	1.7 ± 0.3	56.3 ± 11.4	329	n/a
Yb₂Zr₂O₇	1.5 ± 0.1	60.5 ± 7.6	319	10
(Yb_0.2Er_0.2Dy_0.2Sm_0.2Nd_0.2)₂Zr₂O₇	1.3 ± 0.1	65.8 ± 10.6	307	22

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