Na3Sc(PO4)2: Thermal behaviors, distorted β-K2SO4-type structure and dielectric properties

被引：0
作者：
Dikhtyar, Yu. Yu. [1 ,2 ]
Mosunov, A. V. [1 ]
Posokhova, S. M. [1 ]
Baryshnikova, O. V. [1 ]
Lazoryak, B. I. [1 ]
Morozov, V. A. [1 ]
机构：
[1] Lomonosov Moscow State Univ, Chem Dept, Moscow 119991, Russia
[2] Skolkovo Inst Sci & Technol, Ctr Energy Sci & Technol, Moscow 121205, Russia
来源：
SOLID STATE SCIENCES | 2024年 / 155卷
基金：
俄罗斯科学基金会;
关键词：
Phosphate; beta-K2SO4; Crystal structure; Conductivity; Arcanite; Glaserite; COMMENSURATELY MODULATED STRUCTURE; CRYSTAL-STRUCTURE; WHITE-LIGHT; PHOTOLUMINESCENCE PROPERTIES; LUMINESCENCE PROPERTIES; HYDROTHERMAL SYNTHESIS; CONVERSION PHOSPHORS; ION CONDUCTIVITY; SINGLE-CRYSTALS; DOUBLE SODIUM;
D O I：
10.1016/j.solidstatesciences.2024.107635
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
The Na3Sc(PO4)(2) (NSPO) compound was obtained by solid-state synthesis method and has a new type of distorted beta-K2SO4 (arcanite) crystal structure that was refined based on powder XRD data in the space group (SG) P2(1)/c, with unit cell parameters: a = 11.5533(1) & Aring;, b = 5.31759(5) & Aring;, c = 16.7650(2) & Aring;, beta = 97.6439(6)degrees. The NSPO is a metastable phase with an optimal synthesis temperature range between 1173 and 1233 K. When a mixture of Na2CO3, NH4H2PO4 and Sc2O3 is annealed below this temperature range, the NaSICON-type compound and Na-polyphosphates is formed. However, annealing above T similar to 1245 K leads to the decomposition onset into the NaSICON-type compound (Na3Sc2(PO4)(3)), Na3PO4 and terminates at T similar to 1289 K. NSPO phase is dielectric with sigma(bulk) = 4.4 x 10(-7) S/cm at 300 K. Increasing the temperature from 300 to 1000 K leads to an increase in sigma(bulk) by four orders (sigma(bulk) = 5.6 x 10(-3) S/cm at 1000 K).
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页数：9
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