New ring silicates Cs4Tm2[Si4O12](OH)(2) and Cs-4(Tm,Tb)(2)[Si4O12](OH)(2) have been synthesized by the hydrothermal method. A structural analogy is revealed between them and the previously studied silicates K4Sc2(OH)(2)(Si4O12) and K2Sc[Si2O6]F. Their crystal structures are identified as orthorhombic merohedral twins by the lost element of tetragonal symmetry. The structures of new ring silicates are related to those of fresnoite and tetragonal melilite.
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Beijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China
Natl Key Lab Sci & Technol Mat Shock & Impact, Beijing 100081, Peoples R ChinaBeijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China
Abrar, Sehreish
Ma, Zhuang
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Beijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China
Natl Key Lab Sci & Technol Mat Shock & Impact, Beijing 100081, Peoples R ChinaBeijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China
Ma, Zhuang
Liu, Ling
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Beijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China
Natl Key Lab Sci & Technol Mat Shock & Impact, Beijing 100081, Peoples R ChinaBeijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China
Liu, Ling
Nazeer, Faisal
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China Univ Min & Technol, Sch Mat & Phys, Xuzhou 221116, Peoples R China
Dongguan Univ Technol, Sch Mech Engn, Dongguan 523808, Peoples R ChinaBeijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China
Nazeer, Faisal
Malik, Abdul
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Dongguan Univ Technol, Sch Mech Engn, Dongguan 523808, Peoples R ChinaBeijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China