物理学报2017，Vol.66Issue(7)：370-375,6.DOI:10.7498/aps.66.076501
Al3+/Mo6+双离子取代ZrV2O7中Zr4+/V5+实现近零膨胀
Substitutions of dual-ion Al3+/Mo6+ for Zr4+/V5+ in ZrV2O7 for realizing near-zero thermal expansion
摘要
Abstract
Zr1-xAlxV2-xMoxO7 (0 ≤ x ≤ 0.9) is developed by the solid state method,and the near-zero thermal expansion is realized by adjusting the quantity of substitution of Al3+/Mo6+ for Zr4+/V5+ in ZrV2OT.For smaller x values (x ≤ 0.3),the samples remain the same cubic structure as that of ZrV2O7.The Coulomb interaction between (Al/Zr)-and (Mo/V)+ increases gradually with increasing the quantity of dual-ion substitution of Al3+/Mo6+ for Zr4+/V5+ in ZrV2O7,which reduces the fraction of the distortionless cubic structure in the sample.For x≥ 0.7,the cubic structures could not be found.For Zro.5Alo.sV1.sMoo.5O7,near-zero thermal expansion is obtained in a temperature range from 425 to 750 K (-0.39 × 10-6 K-1).The mechanism of low thermal expansion of Zr0.5Al0.5V1.5Mo0.5O7 could relate to the distortion of crystal structure due to partial substitution of Al3+/Moe+ for Zr4+/V5+ in ZrV2O7 and the effect of the substitution on the unsubstituted lattice.关键词
双离子替代/晶格结构畸变/近零膨胀/ZrV2O7Key words
dual-ion substitutions/distortion of lattice/mear-zero thermal expansion/ZrV2O7引用本文复制引用
袁保合,曹文思,葛向红,程永光,刘献省,梁二军..Al3+/Mo6+双离子取代ZrV2O7中Zr4+/V5+实现近零膨胀[J].物理学报,2017,66(7):370-375,6.基金项目
国家自然科学基金(批准号:11574276)资助的课题.Project supported by the National Natural Science Foundation of China (Grant No.11574276). （批准号:11574276）
