Glass-ceramics containing ferroelectric bismuth germanate (Bi2GeO5)
Glass-ceramics containing ferroelectric bismuth germanate (Bi2GeO5)
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DOI：
10.1016/s0955-2219(02)00410-7
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发表时间：
2003-09
影响因子：
5.7
通讯作者：
K. Pengpat;D. Holland
中科院分区：
文献类型：
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作者：
K. Pengpat;D. Holland
用bio1.5 - geo2 - bo1.5体系制备了玻璃，并对其反玻化行为和微晶玻璃的性能进行了研究。铁电相（正交Bi2GeO5）的晶体在研究的所有玻璃成分中均有析出，并且在60 mol% BiO1.5:20 mol% GeO2:20 mol% BO1.5范围内为主要相。随着结晶温度的改变，微晶玻璃的微观结构发生了巨大的变化，产生了球晶或表面结晶，可用于定向生长。所选bi2geo5玻璃陶瓷的介电性能和铁电滞回线表明，该材料在Ps=14 μC/cm2的室温条件下具有铁电性。
Glasses have been formed from the BiO1.5–GeO2–BO1.5system and a study made of their devitrification behaviour and the properties of the glass-ceramics obtained. Crystals of the ferroelectric phase, orthorhombic Bi2GeO5, are precipitated in all of the glass compositions studied and this is the dominant phase in the region of 60 mol% BiO1.5:20 mol% GeO2:20 mol% BO1.5. The microstructures of the glass-ceramics have been found to change dramatically on altering the crystallisation temperature, yielding spherulites or surface crystallisation which can be used to produce oriented growth. The dielectric behaviour and ferroelectric hysteresis loop of a selected Bi2GeO5glass-ceramic show that this material can be ferroelectric at room temperature with Ps=14 μC/cm2.