Low-temperature high magnetic field powder x-ray diffraction setup for field-induced structural phase transition studies from 2 to 300 K and at 0 to 8-T field

被引：8

作者：

Shahee, Aga ^{[1
]}

Sharma, Shivani ^{[1
]}

Kumar, Dhirendra ^{[1
]}

Yadav, Poonam ^{[1
]}

Bhardwaj, Preeti ^{[1
]}

Ghodke, Nandkishor ^{[1
]}

Singh, Kiran ^{[1
]}

Lalla, N. P. ^{[1
]}

Chaddah, P. ^{[1
]}

机构：

[1] UGC DAE Consortium Sci Res, Univ Campus,Khandawa Rd, Indore 452001, MP, India

来源：

REVIEW OF SCIENTIFIC INSTRUMENTS | 2016年 / 87卷 / 10期

关键词：

CRYSTAL-LATTICE; HOLMIUM METAL; MANGANITES;

D O I：

10.1063/1.4963843

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

A low-temperature and high magnetic field powder x-ray diffractometer (XRD) has been developed at UGC-DAE CSR (UGC: University Grant Commission, DAE: Department of Atomic Energy, and CSR: Consortium for scientific research), Indore, India. The setup has been developed around an 18 kW rotating anode x-ray source delivering Cu-K-alpha x-rays coming from a vertical line source. It works in a symmetric theta-2 theta parallel beam geometry. It consists of a liquid helium cryostat with an 8 T split-pair Nb-Ti superconducting magnet comprising two x-ray windows each covering an angular range of 65 degrees. This is mounted on a non-magnetic type heavy duty goniometer equipped with all necessary motions along with data collection accessories. The incident x-ray beam has been made parallel using a parabolic multilayer mirror. The scattered x-ray is detected using a NaI detector through a 0.1 degrees acceptance solar collimator. To control the motions of the goniometer, a computer programme has been developed. The wide-angle scattering data can be collected in a range of 2 degrees-115 degrees of 2 theta with a resolution of similar to 0.1 degrees. The whole setup is tightly shielded for the scattered x-rays using a lead hutch. The functioning of the goniometer and the artifacts arising possibly due to the effect of stray magnetic field on the goniometer motions, on the x-ray source, and on the detector have been characterized by collecting powder XRD data of a National Institute of Standards and Technology certified standard reference material LaB6 (SRM-660b) and Si powder in zero-field and in-field conditions. Occurrence of field induced structural-phase transitions has been demonstrated on various samples like Pr0.5Sr0.5MnO3, Nd0.49Sr0.51MnO3-delta and La0.175Pr0.45Ca0.375MnO3 by collecting data in zero field cool and field cool conditions. Published by AIP Publishing.

引用

页数：9

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