Schottky contribution to the heat capacity of monazite type (La,Pr)PO4 from low temperature calorimetry and fluorescence measurements

被引：19

作者：

Bauer, J. D. ^{[1
]}

Hirsch, A. ^{[2
]}

Bayarjargal, L. ^{[1
]}

Peters, L. ^{[2
]}

Roth, G. ^{[2
]}

Winkler, B. ^{[1
]}

机构：

[1] Goethe Univ Frankfurt, Inst Geowissensch, Altenhoferallee 1, D-60438 Frankfurt, Germany

[2] Rhein Westfal TH Aachen, Inst Kristallog, Jagerstr 17-19, D-52066 Aachen, Germany

来源：

CHEMICAL PHYSICS LETTERS | 2016年 / 654卷

关键词：

Schottky contribution; Calorimetry; Fluorescence; Monazite; DESIGN; LAPO4;

D O I：

10.1016/j.cplett.2016.05.012

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We show that the combination of fluorescence spectroscopy and low temperature heat capacity measurements of Pr-containing samples in the (La,Pr)PO4 solid solution series can be employed to strongly constrain the Stark energy levels of Pr3+ in monazite type structures. The resulting set of Stark energy levels for the H-3(4) ground state of Pr3+ reproduces the low temperature Schottky anomaly of the heat capacity much more accurately than theoretical models published earlier. We also show that there is no excess heat capacity along the binary solid solution with respect to an interpolation between the two end members LaPO4 and PrPO4. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：97 / 102

页数：6