采用固相法成功制备了纯度较高的各向异性负热膨胀材料Sc2W3O12。将ZrO2与Sc2W3O12按一定体积比混合，在1200℃烧结10h制备Sc2W3O12／ZrO2复合材料。通过XRD、SEM、EDS和热膨胀仪对合成样品的晶体结构、断面形貌和热膨胀性能进行表征。结果表明：样品组元为正交相Sc2W3O12和单斜相Z2O2；在30-600℃内，Sc2W3O12／ZrO2复合材料的热膨胀系数皆线性一致，并且通过改变Sc2W3O12的体积分数，其热膨胀系数可以控制为正、负或零，其中60％Sc2W3O12／ZrO2复合材料在30-600℃的平均热膨胀系数为0．026×10^-6℃^-1，近似为0。
参考文献：
[1] Evans J SO, Mary T A, Sleight A W, Negative thermal expansion in a large molybdate and tungstate family [J]. J Solid State Chem, 1997, 133: 580-583.
[2] 关振铎,张中太,焦金生.无机材料物理性能[M].北京:清华大学出版社,1992:127.
[3] Mary T A, Evans J S O, Vogt T, et al. Negative thermal expansion from 0. 3 to 1050 Kelvin in ZrW208 [J]. Scienee, 1996, 272(5): 90-92.
[4] Niwa E, Wakamiko S, Ichikawa T, et al. Preparation of dense ZrW2O8/ZrO2 cosintered ceramics with controlled thermal expansion coefficients [J].J Ceram Soc Jpn, 2004, 112(5): 271-275.
[5] Lommens P, De Meyer C, Bruneel E, et al. Synthesis and thermal expansion of ZrO2/ZrW208 composites [J].J Eur Ceram Soc, 2005, 25: 3605-3610.
[6] 杨新波,程晓农,严学华.ZrWzO8/Zr02可控热膨胀复合材料的制备[J].复合材料学报,2007,24(3):148-153.
[7] 张志萍,刘红飞,程晓农.原位反应固相法合成低热膨胀ZrW2O8/ZrO2复合材料[J].功能材料,2009,40(2):246-249.
[8] 张志萍,刘红飞,程晓农.化学共沉淀法合成低热膨胀ZrW2O8/ZrO2复合材料[J].复合材料学报,2008,25(4):138-142.
[9] Sun L, Sneller A, Kwon P. ZrW2O8-containing composites with near-zero coefficient of thermal expansion fabricated by various methods. Comparison and optimization [J]. Compos Sci Technol, 2008, 68: 3425-3430.
[10] Sun L, Kwon P. ZrW2O8/ZrO2 composites hy in situ synthesis of ZrO2--WO3: Processing, coefficient of thermal expansion, and theoretical model prediction [J]. Mater Sci Eng A, 2009, 527: 93-97.
[11] 杨新波,程晓农,严学华,等.负热膨胀材料ZrW2O8及其复合材料研究进展[J].材料科学与工程学报,2007,25(1):160一163.
[12] Evans J S O, Mary T A, Sleight A W. Negative thermal expansion in Se2 (WO4)3[J]. J Solid State Chem, 1998, 137 148-160.
[13] Varga T, Wilkinson A P. Neutron powder diffraction study of the orthorhombic to monoclinic transition in SczW3O12 on compression [J].Solid State Sci, 2006, 8: 289-295.
[14] Cetinkol M, Wilkinson A P, Chapman K W. Scandium tungstate above 2. 5 GPa [J]. Solid State Commun, 2008, 148: 511-515.
[15] 朱君君,程晓农,杨娟.Sc2(WO4)3负热膨胀材料合成及其热性能[J].功能材料,2011,42(3):553-556.
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