期刊
NANOSYSTEMS-PHYSICS CHEMISTRY MATHEMATICS
卷 12, 期 6, 页码 799-807出版社
ST PETERSBURG NATL RESEARCH UNIV INFORMATION TECHNOLOGIES, MECH & OPTICS
DOI: 10.17586/2220-8054-2021-12-6-799-807
关键词
hydrothermal treatment; lanthanum and yttrium orthophosphates; thermal diffusivity; specific heat capacity; thermal conductivity
资金
- Russian Foundation for Basic Research [18-2912119]
This study synthesized nanocrystalline La0.9Y0.1PO4 material with monazite structure through thermal treatment, and investigated the influence of treatment temperature on its properties. Annealing-quenching treatment at different temperatures resulted in varied porosity, grain growth, and active sintering above 1300 degrees C. Nanocrystalline materials with a grain size of around 40 nm treated at 1200 degrees C exhibited good thermal and mechanical properties, suitable for thermal insulation applications.
A lanthanum orthophosphate- and yttrium-based monazite structured La0.9Y0.1PO4 nanocrystalline material was synthesized. The influence of the thermal treatment temperature on its thermal and mechanical properties has been determined. It was shown that the hydrothermal treatment of coprecipitated phosphates at 230 degrees C for 110 minutes yielded monazite structured nanoparticles with the crystallite size of about 16 nm. Nanopowder thermal treatment for 20 min in the annealing-quenching mode at 1000-1400 degrees C resulted in obtaining compact materials, the porosity of which varied from 52 to 27% with the grain growth from similar to 20 to similar to 100 nm. Active sintering occurred at temperatures above 1300 degrees C. Nanocrystalline materials obtained by heat treatment at 1200 degrees C with a grain size of similar to 40 nm have a porosity of 42%, microhardness of H-v (25 degrees C) = 4 +/- 0.5 GPa, thermal conductivity lambda(25 degrees C) = 0.4 W.m(-1).K-1, and can be used as thermal insulation material.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据