Stress‐induced crystal axis spiral rotation in multiferroic β'‐Gd₂(MoO₄)₃ crystals observed only in the crystallization of Gd₂O₃‐MoO₃‐B₂O₃ glasses is a new world of glass‐crystallization being beyond the usual crystal growth engineering. The self‐powdering phenomenon in crystals synthesized in an electric furnace and the appearance of periodic birefringence images observed in laser‐patterned single crystal lines are reviewed together with some new data. Extremely large stresses are created at the interface between super‐cooled liquids and crystals due to the density difference between glasses/liquids with larger density and crystals with smaller density, and the crystal axis spiral rotation is induced in β'‐Gd₂(MoO₄)₃ crystals in order to relax and release stresses at the interface. The structural origin of the density difference between glasses and crystals is discussed, and the uniqueness of the crystallization of Gd₂O₃‐MoO₃‐B₂O₃ glasses is emphasized. The possibility of the synthesis of dense bulk glass‐ceramics with β'‐Gd₂(MoO₄)₃ crystals is tried using a slow melt‐cooling processing.

中文翻译：

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仅在玻璃结晶中观察到多铁性β'-Gd2（MoO4）3中应力诱导的晶轴螺旋旋转

应力诱发的晶轴螺旋旋转多铁β'的Gd ₂（的MoO ₄）_3个晶体只有在观察到结晶的的Gd ₂ ö ₃ -MoO ₃ -B ₂ ö ₃玻璃是超越常规晶体生长工程的玻璃结晶的新世界。回顾了在电炉中合成的晶体中的自粉化现象以及在激光图案化的单晶线中观察到的周期性双折射图像的出现以及一些新数据。非常大的应力，在过冷液体和晶体之间的界面产生由于与较大的密度和更小的密度的晶体眼镜/液体之间的密度差，和结晶轴螺旋状旋转中被诱导β'的Gd ₂（的MoO ₄）₃晶体以松弛并释放界面应力。讨论了玻璃与晶体之间密度差的结构起源，并强调了Gd ₂ O ₃ ‐MoO ₃ ‐B ₂ O ₃玻璃的结晶唯一性。致密的块状玻璃陶瓷与β'-Gd组成的合成的可能性₂（的MoO ₄）_3米的晶体是使用缓慢熔融冷却处理试过。