> For the complete documentation index, see [llms.txt](https://doc.duaer.com/zh/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.duaer.com/zh/getting-started/materials-project.md).

# 在 Duaer 里查 Materials Project

在 Duaer 里：按化学式或所含元素检索 Materials Project 的计算无机材料，返回材料编号、化学式、元素与原子位点数。一次成功查询用 1 额度。
## 能拿到什么

Duaer 数据市场里的「Materials Project」：按化学式或所含元素检索 Materials Project 的计算无机材料，返回材料编号、化学式、元素与原子位点数。查到结果时用 1 额度，结果交给数字组织的下一个节点。

从节点创建器选 Duaer 数据 → Materials Project，或打开 [数据市场](/zh/getting-started/data-market.md)。相关：[JARVIS-DFT](/zh/getting-started/jarvis.md)、[NOMAD](/zh/getting-started/nomad.md)、[晶体结构（COD）](/zh/getting-started/cod.md)。

## 适合做什么

- 列出某组成的已知物相，如所有 LiFePO4 条目。
- 按所含元素筛选候选材料。

## 在画布里检索

1. 打开节点创建器，选 Duaer 数据 → Materials Project。
2. 填 Formula（如 LiFePO4）或 Elements（如 Li,Fe,O）。
3. Limit 默认 10，最大 20。执行。

查到结果才扣 1 额度；没有结果、输入有误或上游失败都不扣。

## 用 API 调用

- GET https://api.duaer.com/v1/data/materials-project?formula=LiFePO4
- Authorization: Bearer <Duaer key>

下方是与数据市场「复制技能」相同的英文技能，含参数、示例与返回字段。

## 调用技能（英文）

与数据市场「复制技能」一致。

```
---
name: duaer-materials-project
description: >-
  Duaer Materials Project. Computed inorganic materials from the Materials Project by formula or by elements they contain, with material id, formula, elements, and site count.
  One successful search uses 1 Duaer credit.
---

# Duaer Materials Project

Duaer Materials Project searches about 150,000 computed materials through the standard OPTIMADE interface. Each row links to the material page with band structure, stability, and more.

## When to use

- List known phases of a composition, such as all LiFePO4 entries.
- Find materials that contain a set of elements for screening.

## When not to use

- Measured structures from papers. Use https://skills.duaer.com/cod.md.
- Band gaps in the result rows. Use https://skills.duaer.com/jarvis.md.

## Call

`GET https://api.duaer.com/v1/data/materials-project?formula=LiFePO4`

Header: `Authorization: Bearer <Duaer key>`

Use an account key or a model API key.

Get a Duaer key: https://skills.duaer.com/keys.md

## Parameters

Provide `formula` or `elements`.

- `formula` — Formula such as LiFePO4. Matches the reduced formula.
- `elements` — Optional. Materials that contain all of these, such as Li,Fe,O.
- `limit` — Optional. Rows to return, from 1 to 20. Default 10.

## Examples

- `GET https://api.duaer.com/v1/data/materials-project?formula=LiFePO4` — lithium iron phosphate phases.
- `GET https://api.duaer.com/v1/data/materials-project?elements=Li,Co,O&limit=20` — materials containing lithium, cobalt, and oxygen.

## Result

The response is `{ "items": [...] }`. Each item has `source`, `title`, `url`, and `summary`, plus:

- `materialId` — Materials Project id, such as mp-19017.
- `formula` — reduced formula, elements in alphabetical order.
- `elements`, `elementCount` — elements and their count.
- `sites` — atoms in the cell.

Fields without a value are left out.

## Credits

A search that returns at least one row uses 1 credit.
An empty search, a search that finds nothing, or a failed search uses 0.
Wrong input returns 400 with a message and uses 0.
No remaining credits returns 402 and does not search.
A missing key returns 401.

## Related

- https://skills.duaer.com/jarvis.md — Duaer JARVIS-DFT
- https://skills.duaer.com/nomad.md — Duaer NOMAD
- https://skills.duaer.com/cod.md — Duaer Crystal structures (COD)

```
## Questions

### Duaer 的Materials Project检索扣多少额度？

查到结果时扣 1 额度；没有结果或出错不扣。

### 为什么 Duaer 把 LiFePO4 显示成 FeLiO4P？

Materials Project 用按字母排序的约简化学式；Duaer 检索前也按同样方式转换。

## 相关

- [在 Duaer 里查 JARVIS-DFT](https://doc.duaer.com/zh/getting-started/jarvis.md)
- [在 Duaer 里查 NOMAD](https://doc.duaer.com/zh/getting-started/nomad.md)
- [在 Duaer 里查晶体结构（COD）](https://doc.duaer.com/zh/getting-started/cod.md)