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首页> 外文期刊>Acta Crystallographica, Section B. Structural Science >Compressibility of the nitridosilicate SrYb(Si4N7) and the oxonitridoaluminosilicates MYb(Si4-xAlxOxN7-x) (x = 2; M = Sr, Ba).
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Compressibility of the nitridosilicate SrYb(Si4N7) and the oxonitridoaluminosilicates MYb(Si4-xAlxOxN7-x) (x = 2; M = Sr, Ba).

机译:氮化硅酸盐SrYb(Si4N7)和氧杂三铝硅酸盐MYb(Si4-xAlxOxN7-x)(x = 2; M = Sr,Ba)的可压缩性。

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The compressibilities of the nitridosilicate SrYb[Si(4)N(7)] and the oxonitridoaluminosilicates MYb[Si(4-x)Al(x)O(x)N(7-x)] (x = 2; M = Sr, Ba) were investigated by in situ high-pressure X-ray powder diffraction. Pressures up to 42 GPa were generated using the diamond-anvil cell technique. The title compounds are structurally stable to the highest pressure obtained. A fit of a third-order Birch-Murnaghan equation-of-state to the p-V data results in V(0) = 302.91 (6) A(3), B(0) 176 (2) GPa and B' B(0) = 161 (2) GPa and B' = 4.6 (2) for SrYb[Si(4-x)Al(x)O(x)N(7-x)]; and V(0) = 317.3 (5) A(3), B(0) = 168 (2) GPa and B' = 4.7 (2) for BaYb[Si(4-x)Al(x)O(x)N(7-x)]. While the linear compressibilities of the a and c axes of BaYb[Si(4-x)Al(x)O(x)N(7-x)] are very similar up to 30 GPa, distinct differences were observed for SrYb[Si(4)N(7)] and SrYb[Si(4-x)Al(x)O(x)N(7-x)], with the c axis being the most compressible axis. In all of the investigated compounds the bulk compressibility is dominated by the compression behaviour of the tetrahedral network, while the size of the substituted cation plays a minor role.
机译:氮化硅酸盐SrYb [Si(4)N(7)]和氧代三铝硅酸盐MYb [Si(4-x)Al(x)O(x)N(7-x)]的可压缩性(x = 2; M = Sr ,Ba)通过原位高压X射线粉末衍射研究。使用金刚石砧盒技术产生的压力高达42 GPa。标题化合物在结构上对获得的最高压力稳定。三阶Birch-Murnaghan状态方程与pV数据的拟合导致V(0)= 302.91(6)A(3),B(0)176(2)GPa和B'B(0 )对于SrYb [Si(4-x)Al(x)O(x)N(7-x)] = 161(2)GPa和B'= 4.6(2);和BaYb [Si(4-x)Al(x)O(x)的V(0)= 317.3(5)A(3),B(0)= 168(2)GPa和B'= 4.7(2) N(7-x)]。 BaYb [Si(4-x)Al(x)O(x)N(7-x)]的a和c轴的线性压缩率在30 GPa以下非常相似,但对于SrYb [Si (4)N(7)]和SrYb [Si(4-x)Al(x)O(x)N(7-x)],其中c轴是最可压缩的轴。在所有研究的化合物中,整体可压缩性受四面体网络的压缩行为支配,而取代阳离子的大小仅扮演较小的角色。

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