ðə pɹˈiːviəsli ɹᵻpˈoːɹɾᵻd nˌænoʊstɹˈʌktʃɚd ˈɔːlskˈeɪl haɪɚɹˈɑːɹkɪkəl pˌiːbˈiː tˈiː fˈoːɹ ˌɛsˈɑːɹ tˈiː tˈuː nˈɑː wɪð ɐ zˌiːtˈiː ʌv tˈuː.tˈuː ɛɡzˈɪbɪts ɐ lˈæɾɪs θˈɜːməl kɑːndəktˈɪvᵻɾi ʌv zˈiəɹoʊ.fˈaɪv dˈʌbəljˌuː ˈɛm mˈaɪnəs wˈʌn kˈeɪ mˈaɪnəs wˈʌn.
The previously reported nanostructured all-scale hierarchical PbTe-4SrTe-2Na (with a ZT of 2.2) exhibits a lattice thermal conductivity of 0.5 W m−1 K−1.