. (a) Temperature dependence of the lattice thermal conductivity for Cu_2-xSe^[11] and (b) number of atoms in the primitive unit cell versus room temperature lattice thermal conductivity^{[12,13,14,15,16]}

. (a) Schematic diagram of crystal structure for Ba₈Ga₁₆Ge₃₀, (b) a simple spring model and (c) the corresponding dispersion relation of filled and unfilled clathrate^[29]describing interaction between the host cages with a spring constant K₁ and the guest atoms attached to the cages with a spring constant K₂

. Grüneisen parameter versus room temperature lattice thermal conductivity^{[6, 22, 39-53]}

. (a) Phonon frequency dependence of spectral lattice thermal conductivity for (Nb_0.6Ta_0.4)_0.8Ti_0.2FeSb and Nb_0.8Ti_0.2FeSb, and (b) relationship between Ta content and lattice thermal conductivity/disorder parameter for (Nb_0.6Ta_0.4)_0.8Ti_0.2FeSb^[70]

. (a) Inverse FFT images and strain mapping of dislocations in the Mg₂Si_0.5Sb_0.5, and (b) lattice thermal conductivity comparison between Mg₂Si_1-xSb_x and Mg₂Si_1-zSn_z at room temperature^[84]

. (a) Schematic diagram of crystal structure for BiSe and (b) lattice thermal conductivity comparison between Bi₂Se₃ and BiSe^[88]

. (a) Schematic diagram of electron-phonon scattering and (b) comparison of experimental and calculated lattice thermal conductivities by Callaway Model for the silicon sample^[93]

. (a) Schematic diagram of the difference between diffusion model and phonon model, and (b) comparison of calculated minimum lattice thermal conductivities by Cahill model and diffuson model

. Several strategies to obtain low lattice thermal conductivity