Negative Thermal Expansion in Lead-Free La-Substituted Bi0.5Na0.5VO3,Chemistry of Materials

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Negative Thermal Expansion in Lead-Free La-Substituted Bi0.5Na0.5VO3
Chemistry of Materials ( IF 7.2 ) Pub Date : 2020-05-12 , DOI: 10.1021/acs.chemmater.0c01709
Hayato Ishizaki ₁ , Yuki Sakai _{1,

2} , Takumi Nishikubo ₁ , Zhao Pan ₁ , Kengo Oka ₃ , Hajime Yamamoto ₄ , Masaki Azuma _{1,

2}

Affiliation

Negative thermal expansion (NTE) materials, which shrink upon heating, are required in modern technologies. In this study, new lead-free NTE compounds were obtained by substitution of La in PbTiO₃ (PT)-type compounds, Bi_0.5Na_0.5VO₃. Decreasing the stereochemical activity by substitution of La for Bi³⁺ and electron doping by substitution of La for Na⁺ were found to destabilize the tetragonal phase and cause a temperature-induced transition to a small cubic phase accompanied by NTE. The temperature hysteresis was suppressed because the phase transition was second order-like.

中文翻译：

无铅La替代Bi _0.5 Na _0.5 VO _3中的负热膨胀

现代技术需要负热膨胀（NTE）材料，该材料在加热时会收缩。在这项研究中，通过在PbTiO ₃（PT）型化合物Bi _0.5 Na _0.5 VO _3中替代La来获得新的无铅NTE化合物。发现通过用La代替Bi ^3+来降低立体化学活性和通过用La代替Na ⁺来代替电子掺杂会破坏四方相的稳定性，并导致温度引起的过渡到伴随NTE的小立方相。因为相变是二阶的，所以抑制了温度滞后。

更新日期：2020-05-12

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