期刊
ACS BIOMATERIALS SCIENCE & ENGINEERING
卷 5, 期 4, 页码 1725-1743出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsbiomaterials.8b01570
关键词
rare earth; ZrO2; structure; optical; mechanical; imaging
资金
- Council of Scientific and Industrial Research, CSIR, India [01(2952)/18/EMR-II]
- Department of Science and Technology-Science and Engineering Research Board, DST-SERB, India [EMR/2015/002200]
- CSIR, India [09/559(0123)/18-EMR-I]
- Project CICECO-Aveiro Institute of Materials - national funds through the FCT/MEC [FCT UID/CTM/50011/2013]
- FEDER
The impact of selective rare-earth (RE) additions in ZrO2-based ceramics on the resultant crystal structure, mechanical, morphological, optical, magnetic, and imaging contrast features for potential applications in biomedicine is explored. Six different RE, namely, Yb3+, Dy3+, Tb3+, Gd3+, Eu3+, and Nd3+ alongside their variations in the dopant concentrations were selected to accomplish a wide range of combinations. The experimental observations affirmed the roles of size and dopant concentration in determining the crystalline phase behavior of ZrO2. The significance of tetragonal ZrO2 (t-ZrO2) -> monoclinic ZrO2 degradation is evident with 10 mol % of RE substitution, while RE contents in the range of 20 and 40 mol % ensured either t-ZrO2 or cubic ZrO2 (c-ZrO2) stability until 1500 degrees C. High RE content in the range of 80-100 mol % still confirmed the structural stability of c-ZrO2 for lower-sized Yb3+, Dy3+, and Tb3+, while the c-ZrO2 -> RE2Zr2O7 phase transition becomes evident for higher-sized Gd3+, Eu3+, and Nd3+. A steady decline in the mechanical properties alongside a quenching effect experienced in the emission phenomena is apparent for high RE concentrations in ZrO2. On the one hand, the paramagnetic characteristics of Dy3+, Tb3+, Gd3+, and Nd3+ fetched excellent contrast features from magnetic resonance imaging analysis. On the other hand, Yb3+ and Dy3+ added systems exhibited good X-ray absorption coefficient values determined from computed tomography analysis.
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