Velocity of Sound and Elastic Properties of Alkali Metal Germanate Glasses

碱金属锗酸盐玻璃的声速与弹性性能

• 批准号: 09650741
• 负责人: KODAMA Masao
• 金额: $ 2.24万
• 依托单位: Kumamoto Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650741/
• 关键词: Glass; Alkali metal germanates; Alkali metal borates; Velocity of sound; Elastic constants; Glass transition; Thermal analysis; ゲルマニウム酸塩異常

[Objective] Alkali borate glasses and alkali germanate glasses exhibit peculiar properties termed borate anomalies and germanate anomalies, respectively. The purpose of the present research is to elucidate similarities and differences between alkali borate glasses and alkali germanate glasses from the velocity of soud and elastic properties of these glasses.[Experimental] For the binary alkali metal germanate glasses xM_2O(1 - x)GeO_2 where M = Li, Na, K, Rb and Cs, the density and the velocity of sound were determined. (1) A powder synthesized chemically from alkali metal hydroxide and quartz-type germanium dioxide was fused in a platinum crucible at temperatures from 1100 to 1450ﾟC for 2 h and then the liquid was poured into a graphite mold to form a cylindrical bulk glass. (2) The contents of alkali metal and germanium dioxide were determined by a potentiometric titrimetry. (3) The glass transition temperature and the change in heat capacity at the glass transition were determined by a differential scanning calorimeter. (4) The density was measuredby a hydrostatic weighing method. (5) The ultrasonic velocity was measured at a frequency of 10 MHz by means of the pulse-echo overlap method.[Results and Discussion] The velocity of sound and the elastic constants of alkali germanate glasses wed single maxima at the composition of x = 0.15-0.20. This behavior is different from the behavior of alkali borate glasses : (1) the velocity in lithium borate glasses increases monotonically with an increase in the content of lithium oxide, (2) the velocity in sodium and potassium borate glasses shows a single maximum, (3) the velocity in rubidium and caesium borate glasses exhibits a maximum, a minimum and another maximum in succession. Since the papers for germanate glasses are in preparation, the papers for borate glasses are given in References.

[目的]碱性硼酸盐玻璃和碱性锗酸盐玻璃分别表现出特殊的性质，分别称为硼酸盐反常和锗反常。本研究的目的是从声速和弹性性质两个方面阐明碱式硼酸盐玻璃和碱式锗酸盐玻璃的异同。[实验]测定了二元碱金属锗酸盐玻璃xM_2O(1-x)GeO_2(M=Li，Na，K，Rb和Cs)的声密度和声速。(1)将碱金属氢氧化物和石英型二氧化锗化学合成的粉末在1100~1450ﾟC的铂金坩埚中熔化2 h，然后倒入石墨模中，形成圆柱形大块玻璃。(2)用电位滴定法测定了碱金属和二氧化锗的含量。(3)用差示扫描量热仪测定了玻璃化转变温度和玻璃化转变时的热容变化。(4)采用静压称重法测定密度。(5)用脉冲-回波叠加法测量了10 MHz频率下的声速.[结果和讨论]在x=0.15-0.20时，碱锗酸盐玻璃的声速和弹性常数呈单峰.这一行为不同于碱性硼酸盐玻璃的行为：(1)锂硼酸盐玻璃中的速度随锂氧化物含量的增加而单调增加；(2)钠和钾硼酸盐玻璃中的速度呈现单峰现象；(3)Rb和Cs玻璃中的速度依次出现最大值、最小值和另一个最大值。由于有关锗玻璃的论文正在准备中，因此有关硼酸盐玻璃的论文在参考文献中给出。

项目成果

M.Kodama, S.Feller, and M.Affatigato: "Thermal and Mechanical Properties of Lithium Borate Glasses in Relation to the Glass Structure" J.Thermal Anal.(in press.).

M.Kodama、S.Feller 和 M.Affatigato：“硼酸锂玻璃的热性能和机械性能与玻璃结构的关系”J.Thermal Anal（正在出版）。

M.Kodama: "Thermal and Mechanical Properties of Lithium Borate Glasses in Relation to the Glass Structure" Journal of Thermal Analysis and Calorimetry. 印刷中.

M.Kodama：“硼酸锂玻璃的热性能和机械性能与玻璃结构的关系”《热分析与量热学杂志》正在出版。

M.Kodama: "Ultrasonic Velocity in Alkali Metal Borate Glasses" Proceedings of the 17th International Congress on Glass. 3. 719-724 (1995)

M.Kodama：“碱金属硼酸盐玻璃中的超声波速度”第 17 届国际玻璃大会论文集。

M.Kodama and S.Kojima: "Velocity of Sound and Elastic Properties of Alkali Borate Glasses" Proceedings of the second International Conrerence on Borate Glasses, Crystals and Melts, eds. A.C.Wright, S.A.Feller, and A.C.Hannon. The Society of Glass Technolo

M.Kodama 和 S.Kojima：“碱硼酸盐玻璃的声速和弹性特性”第二届国际硼酸盐玻璃、晶体和熔体会议论文集，编辑。

M.Kodama: "Velocity of Sound and Elastic Properties of Alkali Borate Glasses" Proceedings of the Second International Conference on Borate Glasses, Crystals and Melt. 1. 181-188 (1997)

M.Kodama：“碱硼酸盐玻璃的声速和弹性特性”第二届硼酸盐玻璃、晶体和熔体国际会议论文集。