JETP Letters ( IF 1.4 ) Pub Date : 2020-10-08 , DOI: 10.1134/s0021364020150096 S. I. Sadovnikov
It has been shown that the heat capacity of argentite β-Ag2S, which is nanocrystalline superionic silver sulfide, includes an additional positive contribution caused by the existence of the lower and upper bounds of the phonon spectrum because of a small size of particles. The estimate of this contribution from experimental data on the difference of the heat capacities of nano- and coarse-crystalline argentite β-Ag2S in the region of its existence 470–850 K makes it possible to determine for the first time the velocities of propagation of longitudinal and transverse elastic oscillations cl and ct and the elastic rigidity constants c11, c12, and c44. It has been found that an increase in the temperature results in a decrease in the elastic characteristics of argentite. The directions of the crystal lattice of argentite corresponding to the maximum and minimum elastic moduli have been determined.
中文翻译:
超离子硫化银中纵向和横向弹性振动的速度
它已经显示,辉银矿β-Ag的热容量2 S,这是纳米晶体超离子硫化银,包括由声子谱的,因为颗粒的小尺寸的下界和上界的存在的额外的积极贡献。从实验数据这一贡献上的纳米和粗晶辉银矿β-Ag的热容量的差的估计2 S IN其存在的区域470-850ķ使得能够确定用于第一时间的速度纵向和横向弹性振荡c l和c t的传播以及弹性刚度常数c 11,c 12,以及c 44。已经发现,温度的升高导致银辉石的弹性特性降低。已经确定了对应于最大和最小弹性模量的银辉石的晶格方向。