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Ceramics and glass ceramics exhibiting low or negative thermal expansion
Ceramics and glass ceramics exhibiting low or negative thermal expansion
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机译：表现出低或负热膨胀的陶瓷和玻璃陶瓷
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摘要
Ceramics and glass-ceramics have low and/or negative coefficients of thermal expansion. Crystalline phases of the formula AM2Si2-yGeyO7 (A=Sr and Ba and M=Zn, Mg, Ni, Co, Fe, Cu, Mn, with Sr, Ba and Zn necessarily having to be present) can be produced by conventional ceramic processes or by crystallization from glasses. The compositions form solid solutions, where the elements indicated as component M can be replaced by one another in virtually any concentration but the concentration of Zn must always be at least 50% of the sum of all components indicated under M. The stoichiometry of these silicates and also their structure can differ to a greater or lesser extent.
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机译：陶瓷和玻璃陶瓷具有低和/或负的热膨胀系数。分子式为AM 2 Si 2-y Ge y O 7 （A = Sr and Ba and M = Zn，Mg，Ni，Co，Fe，Cu，Mn，必须存在Sr，Ba和Zn）可以通过常规的陶瓷工艺或通过从玻璃中结晶来生产。该组合物形成固溶体，其中表示为组分M的元素实际上可以任何浓度相互替换，但是Zn的浓度必须始终至少是M下指示的所有组分之和的至少50％。这些硅酸盐的化学计量它们的结构或多或少可以有所不同。
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